Commercial Door Service
Every loading dock, automatic door, and fire door in America needs annual service
Bottom line
Worth studying, but do not buy without strong local proof.
Commercial door service companies install, repair, and maintain the full range of commercial doors: automatic sliding/swing doors at retailers and hospitals, overhead rolling steel doors at warehouses, high-speed fabric doors at distribution centers, and loading dock equipment. Critically, fire doors are required by NFPA 80 to be annually inspected and certified — creating a mandatory recurring revenue stream. A 10-technician operation servicing a mix of retail, industrial, and healthcare clients generates $1M–$3M in annual revenue with stable 30–40% gross margins.
How It Works
Technicians respond to emergency repair calls (a broken door is an emergency for a retailer or warehouse) and perform scheduled preventive maintenance under annual service contracts. Fire door inspection is code-mandated: any building with fire-rated doors must have them inspected and tagged annually. You build a book of service contracts (monthly recurring), respond to emergency repairs (high margin), and quote new door installations (capital project). Emergency calls carry 2–4x premium labor rates.
BizBite verdict
Watch / verify
Commercial Door Service maps to the Commercial Door Service model. The category can work for acquisition buyers, but the right answer depends on source freshness, verified economics, and the specific red flags below.
Why it may work
- +Attractive 35% estimated margin profile
- +Category usually has strong acquisition-financing fit
- +SBA dataset shows 59 recent comparable loans
- +5 clear operating upside levers identified
Be careful
- !Source link status has not been verified yet
- !No last-checked date yet
Category operating model
Commercial Door Service
Revenue drivers
- • Preventive maintenance contracts for dock doors, sectional doors, rolling steel doors, high-speed doors, gates, operators, and loading-dock equipment
- • Emergency repair volume from stuck doors, broken springs, damaged panels, failed operators, dock-leveler issues, and forklift impacts
- • Replacement/retrofit projects, fire-door/drop testing, safety upgrades, seals, controls, and access-system add-ons
- • Technician utilization, truck stock, dispatch response time, first-trip completion, and parts availability
- • Density across warehouses, logistics, retail, cold storage, manufacturing, multifamily garages, and property-manager portfolios
Key risks
- • Technician shortage and seller-owned technical judgment can cap transferability
- • Project revenue can flatter sales while parts, freight, lifts, and callbacks dilute margin
- • Safety exposure is real: springs, doors, docks, forklifts, fire doors, and working-at-height are not handyman work
- • Emergency demand is valuable but lumpy unless converted into asset-level PM contracts
- • Large warehouse, property-manager, or GC accounts can reprice or rebid after close
What you need to believe
- Doors and docks are uptime assets for warehouses and retailers; when one fails, shipping or security stops.
- The company has transferable technicians and truck-stock discipline, not just an owner who knows every spring by sight.
- Recurring PM and asset-level records make emergency revenue more predictable after close.
- Project/install work is profitable after parts, freight, lifts, warranty, and management time.
Unit economics
How one unit makes money
Modeled per one four-technician commercial door and dock service company serving warehouses, retail, industrial, and property-manager accounts. Every line shows its arithmetic — rebuild any number yourself.
Revenue build-up
| Line | Low | Base | High |
|---|---|---|---|
| Preventive maintenance and inspection contracts80-250 sites × 20-60 doors/docks per site universe × contracted quarterly/semiannual PM visits at $300-$1,200+ per site visit | $140K | $360K | $900K |
| Emergency/break-fix service and parts1,000-2,500 service calls/year × $350-$900 blended labor/parts ticket for springs, rollers, panels, operators, seals, and dock issues | $180K | $500K | $1.2M |
| Replacement, retrofit, fire-door/drop-test, dock equipment projects40-150 quoted projects/year × $2K-$12K+ for doors, operators, dock levelers, safety upgrades, and larger replacements | $80K | $340K | $900K |
Where it goes — cost structure
- Technicians, helpers, dispatch, overtime, owner replacement30–44%
Skilled tech capacity is the constraint; overtime and callbacks turn emergency premiums into ordinary margin.
- Parts, doors, operators, dock equipment, freight, lifts/subs16–30%
Project work can look great until vendor freight, lift rental, and warranty labor are allocated.
- Vans, fuel, tools, inventory, warehouse, software6–12%
Truck stock drives first-trip completion; poor inventory creates return visits and angry shippers.
- Insurance, workers comp, safety, training/certification, permits5–10%
Doors, springs, docks, and forklifts make this a real risk trade, not simple maintenance.
- Sales, estimating, bad debt, callbacks/warranty, overhead6–11%
Quoting discipline and warranty tracking decide whether growth is profitable.
What actually swings the deal
- Billable service calls per tech per week
±3 calls/week × 4 techs × $575 × 48 weeks ≈ ±$331K revenue before parts and labor cost.
- First-trip completion
10pts more of 1,600 calls completed without return trips can free ~160 tech slots, worth roughly $90K+ of service capacity at $575/call.
- Project gross margin
5pts margin leakage on $340K project revenue ≈ −$17K SDE before warranty/callback drag.
- PM asset count
±500 doors/docks under PM at $90 annualized inspection economics ≈ ±$45K recurring revenue plus repair pull-through.
Benchmarks to memorize
Four productive techs doing 7 billable calls/week each at ~$575 plus PM and project pull-through can support a $1.0M-$1.4M shop. Above that, the business is a technician recruiting, inventory, and dispatch system; the seller’s personal diagnosis ability stops scaling.
Market analysis
Who owns these & where demand comes from
Commercial door service sits inside industrial repair, facility maintenance, and loading-dock uptime. Customers are warehouses, logistics facilities, retailers, manufacturers, cold-storage sites, multifamily garages, campuses, and property managers with doors and docks that fail under daily use. The market is local and technician-constrained, but larger regional platforms exist because the customer base is recurring and mission-critical.
Tailwinds
- ↗ SBA proxy data shows meaningful change-of-ownership activity and financeable deal sizes in commercial/industrial repair NAICS
- ↗ Warehouse uptime pressure makes emergency response less discretionary than many property services
- ↗ Asset databases, dispatch software, and truck-stock discipline let small shops professionalize quickly
Headwinds
- ↘ Skilled technician recruiting and safety training are the real capacity constraints
- ↘ Parts/freight inflation and supply delays can hurt quoted project margins
- ↘ National accounts and property managers can pressure pricing or shift work to platform vendors
Demand drivers
- Warehouses and retailers lose shipping, receiving, security, or temperature control when doors and docks fail
- Forklift impacts, springs/cables/rollers, operator failures, seals, panels, and dock equipment create constant break-fix demand
- PM contracts and fire-door/safety checks turn asset counts into recurring calendars
- E-commerce, cold-chain, and industrial footprints increase the installed base of doors, docks, and specialty access systems
Regulation
Moderate. Requirements vary by product and jurisdiction, but DASMA/IDA/IDEA education, fire-door/drop-test expectations, OSHA/jobsite safety, permits, insurance, and manufacturer instructions all matter. A buyer should underwrite actual technician competency and documentation, not just licenses.
Who you bid against
Buyers include local door/dock companies, HVAC/facility-service platforms, industrial repair firms, PE-backed regional door groups, and SBA searchers. Strategic buyers pay for technician bench, PM contracts, and parts/project capability rather than pure emergency revenue.
Competitive advantage
What protects the good ones
- strongTechnician bench and response reliability
A warehouse with a stuck dock door buys the vendor who answers and fixes it safely the first time.
- strongPM asset database
Door/dock counts, asset age, repair history, and PM cadence convert lumpy emergencies into scheduled account control.
- moderateTruck stock and vendor access
Common parts on the van and supplier relationships raise first-trip completion and protect emergency premiums.
- moderateSafety/compliance credibility
Fire doors, springs, operators, docks, and working at height reward vendors with process, insurance, and documentation.
Who wins — and who loses
The winner has multiple non-owner techs, a live door/dock asset database, stocked trucks, disciplined dispatch, and enough project estimating skill to price parts, freight, lifts, and warranty. The loser buys an owner-tech shop where every emergency call went to the seller’s cell and every profitable repair required the seller to eyeball the spring, fabricate a fix, and calm the warehouse manager.
How this niche degrades
- ↘ Regional facility-service and door platforms can buy scale and national-account relationships
- ↘ Technician scarcity limits growth and can reprice wages faster than old PM contracts escalate
- ↘ Project/install mistakes, safety incidents, or warranty claims can erase service-margin gains
- ↘ Warehouse automation and high-speed specialty doors raise skill requirements and parts complexity
More consolidatable than many Main Street services because warehouse uptime, PM contracts, and parts/project pull-through create strategic value. Still fragmented locally, with SBA-backed buyers and regional platforms both competing for clean technician-led shops.
SBA 7(a) data
Real acquisitions in this category
Change-of-ownership loans · NAICS 811310 · Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance
Deal size distribution
Deal flow over time
Financing profile
Recent comparable deals
| Closed | State | Loan | Implied deal |
|---|---|---|---|
| Mar 2026 | NY | $3.3M | $3.8M |
| Mar 2026 | FL | $2.8M | $3.2M |
| Feb 2026 | WA | $900K | $1.1M |
| Feb 2026 | AZ | $1.4M | $1.7M |
| Feb 2026 | TX | $1.2M | $1.4M |
| Feb 2026 | TX | $250K | $294K |
| Jan 2026 | TX | $200K | $235K |
| Jan 2026 | NY | $500K | $588K |
| Jan 2026 | TX | $1.3M | $1.5M |
| Jan 2026 | MD | $965K | $1.1M |
Source: SBA 7(a) FOIA dataset, filtered to acquisitions (loans where business age is "Change of Ownership"). Implied deal size assumes an 85% loan-to-purchase ratio, a common SBA change-of-ownership structure. Charge-off rate shown only when 10+ loans have resolved (paid in full or charged off). Interest rates reflect last 24 months only. Actual deal values vary with equity injections, seller financing, and working capital terms.
Valuation framework
How these actually get priced
Valued on normalized SDE with a sanity check against SBA implied deal sizes and revenue mix. Premiums go to non-owner technician depth, PM contracts, first-trip completion, project job-costing, and low customer concentration; discounts apply to owner-only technical skill, unsafe operations, project margin leakage, and seller-personal accounts.
What moves the multiple
- ▲ PremiumTechnician bench and dispatch depth
Multiple competent techs plus real dispatch make SDE transferable and support larger deal size.
- ▲ PremiumPM/asset database quality
Door/dock asset counts and repair history turn emergency work into controllable recurring account value.
- ▼ DiscountProject margin and warranty leakage
Install/replacement growth deserves a haircut if job costing, freight, lifts, and callbacks are weak.
- ▼ DiscountOwner/customer concentration
One seller, one dispatcher, or one warehouse/property-manager group controlling revenue lowers the multiple.
Worked example
The profile midpoint is $1.2M revenue at a 35% margin, or about $420K SDE. At 2.5x-5.0x SDE, indicated value is roughly $1.05M-$2.10M. The SBA proxy median implied deal near $916K is a reminder that many actual small shops clear below the midpoint; the high end needs recurring PM, non-owner techs, clean safety history, and profitable project work.
Common buyer mistakes
- ✕ Valuing project revenue like recurring service without allocating parts, freight, lifts, and warranty
- ✕ Ignoring technician transferability and assuming the seller’s repair judgment can be hired overnight
- ✕ Underwriting emergency demand without converting accounts into PM calendars
- ✕ Missing safety, workers-comp, fire-door, and permit exposure because the business looks like simple repair
Deal Calculator
Priced off $420K SDE — can this deal service its own debt?
SDE = revenue × margin estimate for this niche; it includes owner compensation, so budget your salary out of cash flow. Excludes working-capital injection, capex reserves, and taxes. Actual SBA terms vary by lender and borrower.
Due diligence checklist
Before you sign anything
- 01
Export 24-36 months of jobs by customer/site, asset type, PM/emergency/project category, technician, ticket, labor hours, parts, freight, lift/subcontract cost, callback, and gross margin.
This verifies service-call volume, project margin, and first-trip completion sensitivities.
Red flagRevenue exists as invoices but no job-level profitability or callback trail. - 02
Pull the PM and asset database: doors, docks, operators, gates, fire doors, age/condition, service interval, repair history, and next service date.
Recurring asset control is the moat and the multiple driver.
Red flagPM contracts are generic without asset counts or next-service workflow. - 03
Assess every technician by skill set, tenure, certifications/training, call mix handled, safety record, compensation, and post-close retention.
Technician bench is capacity and transferability.
Red flagSeller or one senior tech handles all hard diagnostics and profitable projects. - 04
Review insurance, workers comp, OSHA/safety incidents, spring/door injuries, fire-door records, permits, warranty claims, and open disputes.
Safety and compliance failures can overwhelm SDE.
Red flagUnreported incidents, weak coverage, or recurring project warranty claims. - 05
Call top warehouse, retail, property-manager, GC, and facility accounts to confirm relationship transfer and service quality.
Account stickiness determines whether emergency and PM revenue survives close.
Red flagCustomers call the seller personally or plan to rebid/nationalize the work. - 06
Inspect vans, tool sets, lifts, inventory, open work orders, aged parts, supplier terms, and warranty reserve.
Parts availability and immediate capex affect first-trip completion and purchase price.
Red flagTrucks are understocked, inventory is obsolete, or supplier credit will not transfer.
Pros
- +Emergency-driven demand: a broken loading dock door or jammed automatic entry is always urgent
- +NFPA 80 fire door compliance creates mandatory annual inspection revenue
- +Service contract model (recurring) plus emergency repairs plus new installs — three revenue streams
- +Strong acquisition multiples for established businesses with recurring contract bases
Cons
- -Requires certified technicians (AAADM for automatic doors, DHI for door hardware)
- -Capital intensive — service vans, inventory of door parts, and test equipment
- -Emergency calls require 24/7 on-call coverage, which adds staffing complexity
Best For
Operator-investors comfortable with skilled-trade service businesses; strong fit for those with construction or mechanical service backgrounds
Operating Costs
Service vans (~$40K–$60K each), parts inventory, and technician wages (union or certified technicians earn $60K–$90K/year) are primary costs. Service contracts anchor recurring revenue; emergency calls and project work are the margin drivers.
Deep Dive
BizBite Deep Dive — Commercial Door Service
1) Executive Summary (5 bullets)
- Commercial door service is an acquisition-friendly B2B uptime business: warehouses, retailers, hospitals, schools, offices, and multifamily buildings cannot ignore broken entry doors, dock doors, roll-up doors, automatic doors, or fire doors.
- Demand is a mix of recurring compliance/maintenance plus urgent repair: NFPA 80 fire-door inspection creates an annual inspection hook, while stuck doors create same-day, premium-priced work.
- A small local operator can underwrite cleanly: 2-5 technicians, $500k-$2.0M revenue, 35-45% gross margin on service/parts, and 12-22% normalized SDE when dispatch and inventory are disciplined.
- The moat is local response density, certified technicians, parts availability, property-manager/vendor-list relationships, and documented inspection reports; not brand glamour.
- Best buyer thesis: acquire a founder-led door service shop at 2.5x-4.0x SDE, professionalize pricing/dispatch/contracts, retain technicians, and add annual fire-door/PM routes before chasing big installation projects.
2) Market Research (TAM/SAM/SOM-style reasoning)
Category definition
- Services: commercial door repair, storefront doors, roll-up/overhead doors, dock doors, automatic sliding/swing doors, high-speed fabric doors, fire doors, operators, hinges, closers, locks, frames, seals, and preventive maintenance.
- Buyers: warehouses, distributors, grocers, hospitals, clinics, schools, universities, municipalities, apartment buildings, strip centers, restaurants, hotels, retail chains, industrial plants, and property managers.
TAM anchor
- Broad U.S. door installation and repair services were cited around $7.7B in 2024 by industry-market sources.
- Commercial overhead doors alone are often framed as a multi-billion-dollar market, and automatic doors skew heavily commercial.
- Practical TAM for an acquirer: not every installed door sale, but the recurring service/repair/compliance layer attached to millions of commercial openings.
SAM model for one regional operator Use a 60-90 minute service radius around a mid-sized metro:
- 2,000 industrial/warehouse/logistics sites × 6-20 serviceable openings each.
- 3,000 retail/restaurant/strip-center locations × 1-4 customer-facing or back-of-house doors each.
- 600 healthcare/school/municipal/campus properties × 20-200 rated/interior doors each.
- 1,500 office/multifamily/commercial buildings × 5-50 doors each.
- If only 2,500 reachable accounts average $900-$3,000/year in repair, inspection, and PM spend, the local SAM is roughly $2.25M-$7.5M/year before large installation projects.
SOM model for a buyer
- Year 1 realistic target after acquisition: 150 active accounts averaging $2,200/year = $330k service/inspection revenue, plus $250k-$700k repairs/install projects from the same base.
- Year 3 target: 400 active accounts averaging $2,500/year = $1.0M recurring/service revenue, plus $800k-$1.5M project/emergency work.
- Market share required is tiny: a $1.5M operator in a $5M local SAM owns about 30% of reachable managed spend, but far less than 1% of national category spend.
Why this is acquisition-friendly
- Fragmented local providers, many founder-led.
- Buyers can verify demand through invoice history, dispatch logs, customer lists, technician productivity, and repeat work.
- Commercial accounts usually care more about response time and documentation than the cheapest hourly rate.
- Adjacent tuck-ins are obvious: loading dock repair, automatic door inspection, fire-door inspection, access control, storefront glass partnerships, and facility maintenance routes.
3) Moat Analysis
- Response-time moat: a warehouse door blocking shipments or a retailer door stuck open is urgent. Customers remember who arrives same day with the right parts.
- Technician moat: spring tension, automatic doors, fire-door hardware, dock doors, and operators require skilled, safety-conscious technicians. Losing two senior techs can damage the whole acquisition.
- Compliance moat: NFPA 80 fire-door records, inspection tags, deficiency reports, and AHJ-ready documentation make the vendor harder to replace.
- Parts/inventory moat: stocked rollers, springs, hinges, closers, operators, sensors, weather seals, locks, and common hardware reduce callbacks and vendor lead-time risk.
- Vendor-list moat: property managers, facility directors, retailers, hospitals, school districts, and industrial sites often reuse approved vendors once insurance, safety, and paperwork are cleared.
- Route-density moat: clustered PM and inspection visits let technicians complete more billable work per day; scattered emergency-only work destroys margin.
- Data moat: door asset lists, photos, inspection history, recurring deficiencies, and renewal schedules turn a repair shop into a facility-maintenance database.
4) Unit Economics (3 concrete scenarios with numbers)
Scenario A: 2-technician owner-operator repair shop
- Revenue: $575k/year
- Labor/service: 2 techs × 1,050 billable hours × $155 blended rate = $326k
- Parts/material markup revenue = $175k
- Annual inspections/PM = $74k
- Direct costs: tech wages/payroll burden $155k, parts/materials $105k, truck/fuel/tools $45k.
- Gross profit: $270k / 47% gross margin.
- Overhead: insurance $28k, admin/bookkeeping/software $36k, rent/storage $18k, marketing $12k, misc $20k.
- Normalized SDE before owner replacement: $156k / 27%. After adding a $75k GM/dispatcher replacement, buyer cash flow is closer to $81k.
- Acquisition implication: do not pay a high multiple unless the owner is not the only salesperson, estimator, and technical closer.
Scenario B: 5-technician service-contract shop
- Revenue: $1.65M/year
- Service labor: 5 techs × 1,150 billable hours × $165 = $949k
- Parts/materials = $410k
- Fire-door inspections/PM contracts = $180k
- Small installs/operators = $111k
- Direct costs: tech wages/payroll burden $455k, parts/materials $255k, install equipment/rentals $45k, trucks/fuel/tools $120k.
- Gross profit: $775k / 47% gross margin.
- Overhead: service manager/dispatcher $155k, admin $70k, insurance $60k, rent/software $55k, marketing/sales $45k, warranty/callback reserve $40k.
- EBITDA/SDE: $350k / 21%.
- Acquisition implication: at 3.5x SDE, purchase price is $1.23M. With $245k down, $185k seller note, and $800k bank/SBA debt, annual debt service may run about $140k-$165k, leaving $185k-$210k pre-tax buyer cash flow if revenue holds.
Scenario C: Turnaround from underpriced emergency work
- Starting business: $1.05M revenue, $210k SDE, asking $735k at 3.5x.
- Fix 1: raise after-hours/emergency minimum from $225 to $375 and add 2-hour minimum. If 20 calls/month improve by $150 average gross profit, annual lift = $36k.
- Fix 2: convert 60 accounts to quarterly PM at $325/visit. Revenue = 60 × 4 × $325 = $78k; at 55% contribution margin = $43k gross profit.
- Fix 3: reduce parts leakage by buying top 40 SKUs in bulk and charging list price. If $250k annual parts revenue improves margin by 8 points, annual lift = $20k.
- Fix 4: dispatch tighter routes to add 0.4 billable hours per tech per day across 3 techs for 220 days at $155/hour. Revenue lift = $41k; at 65% contribution = $27k.
- Total SDE lift: $126k. New SDE: $336k. At same 3.5x multiple, value becomes $1.18M, creating $440k paper value before integration risk.
5) Due Diligence Checklist
Financial proof
- 36 months P&L, tax returns, bank statements, credit-card deposits, AR aging, AP aging, payroll records, and owner add-backs.
- Revenue by line: emergency repair, scheduled service, PM contracts, fire-door inspection, parts/materials, installs, subcontracted work.
- Gross margin by job type and by technician, including callbacks/warranty work.
- Customer concentration: top 10 customers by revenue, gross margin, site count, and owner relationship dependency.
- Backlog, open quotes, signed PM contracts, renewals, and recurring inspection calendar.
Operations proof
- Dispatch logs: calls/day, response times, first-time-fix rate, average ticket, billable hours/tech/day, callback rate.
- Technician roster: tenure, pay, certifications, specialties, non-competes where enforceable, and who owns key customer relationships.
- Fleet list: vans, lifts, trailers, mileage, title/liens, repair history, decals, GPS, and replacement capex.
- Inventory list: springs, rollers, hinges, closers, operators, locks, sensors, weather seals, fire-door hardware, serialized items, slow-moving stock.
- Safety/insurance: GL, auto, workers comp, umbrella, OSHA logs, ladder/lift training, lockout/tagout, incident history.
- Compliance documentation: NFPA 80 inspection reports, automatic door inspection forms, customer deficiency notices, AHJ correspondence.
Customer proof
- Sample invoices and signed work authorizations.
- Property-manager/vendor-list status and certificate-of-insurance requirements.
- Referral sources: glass shops, locksmiths, dock equipment vendors, GCs, facility managers, commercial real estate managers.
- Reviews, complaints, warranty disputes, chargebacks, and unresolved claims.
6) What to Watch For
- Owner is the only estimator, salesperson, and senior technician.
- Revenue is mostly one-off installs, not repeat service/inspection work.
- PM contracts are informal verbal relationships with no schedule, pricing, or renewal terms.
- Technician utilization below 4.5 billable hours/day with no clear dispatch reason.
- Parts are billed inconsistently, sold at cost, or missing from inventory records.
- After-hours emergency calls are priced like normal business-hours calls.
- Fire-door inspection claims exist, but reports are incomplete or not AHJ-ready.
- Customer concentration above 25% in one property manager, retailer, school district, or GC.
- Callback/warranty rate above 5-8% of jobs without root-cause tracking.
- Fleet is old and deferred capex consumes the first year of buyer cash flow.
- Safety shortcuts around springs, lifts, automatic doors, or energized operators.
- Big installation backlog with fixed-price bids written before material/labor inflation.
7) How to Finance the Acquisition
- SBA 7(a)/bank loan: strongest fit when tax returns support cash flow, seller stays for transition, AR is collectible, and DSCR clears 1.25x after normalized owner replacement.
- Seller note: push for 10-25% seller financing over 3-5 years. Tie part of the note to technician retention and top-customer retention.
- Buyer equity: expect 10-20% down depending on lender, collateral, and business quality. Keep separate working capital for payroll, parts, and insurance renewals.
- Equipment/vehicle financing: finance vans, lifts, and major equipment separately only if titles are clean and utilization justifies it.
- Earnout/holdback: use for uncertain PM contracts, customer concentration, or owner-controlled relationships. Example: 10% holdback released if top 20 customers produce 85%+ of trailing revenue in the first 12 months.
- Tuck-in structure: if buying a tiny owner route, pay lower cash at close and use seller financing plus a customer-introduction schedule instead of overpaying for goodwill.
8) Valuation & Deal Structure Cheatsheet
Multiple ranges
- Owner-dependent repair book, weak records, few contracts: 1.8x-2.6x SDE.
- Clean 2-5 tech operator with diversified repeat accounts: 2.6x-3.8x SDE.
- Larger 6-12 tech operator with PM contracts, management layer, clean dispatch KPIs, and low concentration: 3.8x-5.0x SDE.
- Strategic/tuck-in buyers may pay more, but a financial buyer should not underwrite strategic synergies as base-case cash flow.
Example deal
- TTM revenue: $1.65M.
- Normalized SDE: $350k after add-backs and realistic manager replacement.
- Base value at 3.4x: $1.19M.
- Structure: $240k buyer equity, $770k SBA/bank debt, $120k seller note, $60k retention holdback.
- Conditions: seller transition for 90 days, top 20 customer introductions, key tech retention bonuses, clean fleet titles, working capital peg for AR/AP/inventory.
Price reducers
- Subtract required year-one fleet capex dollar-for-dollar.
- Discount low-margin install backlog if fixed-price bids cannot be repriced.
- Reduce multiple for owner-controlled sales, undocumented PM work, or technician churn risk.
- Treat inventory at lower of cost or realizable value; obsolete hardware should not be paid for at book value.
9) 10 Questions to Ask the Owner
- What percentage of revenue is repeat service/PM/inspection versus one-off install projects?
- How many active commercial accounts bought from you in the last 12 months?
- Who are the top 10 customers, and which relationships depend personally on you?
- What are billable hours per technician per day, average ticket, first-time-fix rate, and callback rate?
- Which technicians can estimate and complete complex jobs without the owner?
- How do you price emergency, after-hours, and minimum-trip calls?
- Can I see job-level margin by repair, inspection, PM, parts, and install work?
- What certifications, inspection credentials, safety training, and insurance are required by your best customers?
- What fleet, lift, tool, and inventory capex is needed in the next 12-24 months?
- Will you introduce me to top property managers, facility directors, referral partners, and key technicians before closing?
10) 7-Day Action Plan
- Pull 30 local operators from Google Maps, trade directories, BizBuySell, broker sites, and property-manager vendor lists.
- Build a buy box: $500k-$2.5M revenue, 2-8 technicians, 15%+ SDE margin, under 25% customer concentration, documented repeat commercial work.
- Call 10 property managers/facility managers and ask who handles doors, response-time pain, and whether fire-door inspections are scheduled annually.
- Mystery-shop three competitors for a stuck warehouse door, annual fire-door inspection, and quarterly PM quote.
- Build an underwriting model with billable hours/tech/day, average ticket, parts margin, emergency premium, PM contract count, callbacks, and fleet capex.
- Contact 20 owners with a simple angle: confidential succession conversation, keep technicians employed, preserve customer service, seller-financed transition.
- Issue one indication of interest only after receiving dispatch logs, customer revenue by account, payroll, fleet list, inventory list, and 24-36 months of financials.
BizBite Deep Dive | July 20, 2026 | Commercial Door Service
Where to Buy
Commercial door and specialty contractor businesses for sale nationally
M&A advisory firm specializing in service business acquisitions including mechanical/specialty contractors
Industry association for commercial door and hardware professionals with buyer/seller contacts
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