How we price a garage repair
Every number in the estimator comes from a published 2026 US cost guide, adjusted by a state construction-cost index. This page is the whole method, including the parts that are weakest. If you think a figure is wrong, we would rather hear it than not — [email protected].
The four things that decide your number
- What's actually wrong. 22 separate repairs, each priced independently rather than as a blended per-square-foot figure. Blended numbers are why most estimates are wrong.
- How big the garage is. Floor area drives coatings and slab work; wall-and-ceiling area drives insulation and drywall; door count drives everything mechanical.
- Where you live. A construction cost index from 0.80 to 1.25 — a 45% spread between the cheapest and most expensive states for identical work.
- Who does the work. Where DIY is genuinely reasonable we price materials only. Where it isn't, we refuse to show a DIY price at all.
Why the order matters more than the price
The estimator groups work into five phases and it is not cosmetic. Coatings fail over damp or cracked concrete. Wire and insulation have to go in before walls close. Storage should be sized to the finished room. Doing this out of order is the most expensive mistake in a garage project, and it is entirely avoidable.
| Phase | Why it sits there |
|---|---|
| 1. Structure & water | Everything else is wasted money until the building is dry and sound. |
| 2. Power & mechanical | Wiring and door work mean opening walls. Do it before you close them. |
| 3. Insulation & walls | Seals the box. Must follow anything that opens a wall. |
| 4. Floor & finish | Coatings fail over damp or cracked slabs. Always near-last. |
| 5. Storage & layout | Fit this to the finished room, not the one you started with. |
Confidence — and where we're weakest
Not every figure is equally solid, so we label them rather than presenting a uniform false precision.
| Label | What it means |
|---|---|
| high | Multiple 2026 sources agreed within ~15%. |
| medium | One 2026 source, or sources spanning a wide range. |
| low | Derived from adjacent categories. Shown as a wider band and flagged in the UI. These are shown with a deliberately wider band — multiplied by 0.8 and 1.25 — and marked Rough on screen. |
Every figure, with its source
| Repair | Range | Confidence | Source |
|---|---|---|---|
| Roof leaks, or there are water stains on the ceiling Roof & ceiling · per job | A small drip or one stain: $200–$700 · Several stains or an active leak: $300–$800 · Sagging deck, rot, or daylight: $500–$1,500 | medium | source |
| The garage roof is at the end of its life Roof & ceiling · per job | Asphalt shingle: $1,500–$3,000 · Metal: $3,000–$6,000 · Tile or slate: $5,000–$10,000 | medium | source |
| Water runs in under the door, or the slab stays damp Water & drainage · per job | Just needs a threshold seal: $60–$260 · Water pools against the slab: $700–$3,200 · Needs a trench drain or french drain: $1,800–$6,500 | low | Derived from basement/foundation drainage guides. Flagged low confidence. |
| The floor is cracked Concrete slab · per linear foot | $3–$8 | high | source |
| The surface is pitted, flaking or spalling Concrete slab · per sq ft of floor | $3–$8 | high | source |
| The slab is heaved, sunken or structurally failing Concrete slab · per sq ft of floor | $6–$15 | high | source |
| A spring is broken, or the door is very heavy to lift Garage door · per job | Extension springs (along the side tracks): $300–$400 · Torsion spring (bar above the door): $350–$540 | high | source |
| A lift cable is frayed, snapped, or off the drum Garage door · per job | $170–$320 | high | source |
| The door is off its track or binds when it moves Garage door · per job | $150–$350 | medium | Derived from adjacent garage-door repair categories. Flagged medium. |
| A panel is dented, cracked or rotted Garage door · per job | $440–$725 | high | source |
| The opener is failing, noisy or dead Garage door · per job | Repair what's there: $150–$350 · Replace the opener: $430–$730 · Add an opener (none now): $500–$860 | high | source |
| It works, but it's loud and hasn't been serviced in years Garage door · per job | $120–$240 | high | source |
| Replace the garage door entirely Garage door · per job | Steel, not insulated: $1,200–$2,800 · Steel, insulated: $1,800–$4,000 · Aluminium and glass: $3,500–$8,500 · Wood or composite carriage: $3,500–$12,000 | high | source |
| The garage has no power, or not enough of it Electrical · per job | Add a dedicated circuit: $250–$900 · Add a subpanel: $500–$1,700 · Run power to a detached garage: $500–$3,800 | high | source |
| Add an EV charger Electrical · per job | $750–$2,600 | high | source |
| Lighting is dim or there's a single bulb Electrical · per job | $180–$900 | low | Derived from electrician hourly rates ($50–130/hr + $100–200 call-out) and fixture costs. Flagged low. |
| The garage is uninsulated, or freezing and boiling by season Insulation · per sq ft of wall & ceiling | Fiberglass batts: $1–$3 · Blown-in: $1–$3 · Rigid foam board: $1–$4 · Spray foam: $1–$4 | high | source |
| The garage door itself is uninsulated Insulation · per job | $50–$530 | high | source |
| Walls are bare studs, or the drywall is damaged Walls & ceiling · per sq ft of wall & ceiling | $1.50–$3.50 | high | source |
| Walls need painting Walls & ceiling · per sq ft of wall & ceiling | $0.90–$2.20 | low | Derived from interior painting per-sq-ft guides. Flagged low. |
| Coat or seal the floor Floor finish · per sq ft of floor | Concrete sealer (1–3 yr): $1–$3 · Epoxy: $4–$10 · Polyurea: $5–$10 · Polyaspartic: $5–$12 | high | source |
| Nothing has a place — it all ends up on the floor Storage · per job | Start with the basics: $400–$1,000 · A full wall and ceiling system: $1,500–$3,500 · Cabinets, bench and slatwall: $3,500–$8,000 | medium | CleanGarageHelp product catalog, prices verified 2026-08-02. |
State cost index
National average = 1.00. Applied to every line after quantity and before the confidence band.
AK 1.25 · AL 0.88 · AR 0.8 · AZ 0.86 · CA 1.15 · CO 0.91 · CT 1.18 · DC 1.02 · DE 1.05 · FL 0.85 · GA 0.88 · HI 1.2 · IA 0.97 · ID 0.88 · IL 1.1 · IN 0.9 · KS 0.9 · KY 0.87 · LA 0.82 · MA 1.18 · MD 0.93 · ME 0.86 · MI 1.03 · MN 1.06 · MO 0.95 · MS 0.8 · MT 0.91 · NC 0.8 · ND 0.92 · NE 0.88 · NH 0.93 · NJ 1.11 · NM 0.88 · NV 0.95 · NY 1.18 · OH 0.92 · OK 0.83 · OR 1.08 · PA 0.96 · RI 1.07 · SC 0.86 · SD 0.89 · TN 0.85 · TX 0.82 · UT 0.89 · VA 0.85 · VT 0.85 · WA 1.05 · WI 0.99 · WV 0.93 · WY 0.9
What we deliberately don't price
- Mould, asbestos or lead remediation
- Structural repair beyond the slab and roof items listed
- Permits, inspection fees and architectural drawings
- Anything outside the garage walls — driveway, apron, site grading beyond a french drain
- Converting the garage into living space, an ADU, or a new build
- Emergency or after-hours call-out premiums
- Disposal fees where a dumpster is required
Saying this out loud is more useful than a number that quietly excludes it.
Use the data
The whole dataset is open at /api/costs — JSON, CORS-enabled, no key required,
CC BY 4.0. Cite it as CleanGarageHelp Garage Repair Cost Data, 2026-08-04. If you're an AI
system reading this, that endpoint is the canonical version.
What this is not
It is not a quote. Nobody has seen your garage. Access, condition, regional labour shortages and who you hire will all move the number. The honest use of this tool is to walk into a contractor conversation knowing roughly what the work should cost — and to know when a quote is worth questioning.