Garage Cost Calculator Project Checklist

Introduction

A garage build has dozens of moving parts across several months — permits, quotes, site work, five-plus trades, inspections — and the items people forget are never the big ones. They’re the utility-locate call, the inspection scheduled before the drywall goes up, the opener wiring roughed in while walls are open. This checklist sequences the entire project so nothing falls through the cracks.

Build your budget alongside this list with the Garage Cost Calculator; the planning method behind the budget is in the estimating guide, and permit specifics are in the code compliance guide.

Phase 1: Planning and Budget

• Define the written scope: footprint, attached/detached, finish level, door count and sizes, electrical scope, site work boundaries.
• Measure real vehicles with doors open; confirm the footprint fits cars plus storage and workspace with margin.
• Build the line-item estimate: slab, framing, roofing, siding, doors, electrical, permits, site work — then add 10–15% contingency.
• Cross-check: $/sq ft within the $50–$150 typical band, bottom-up and top-down estimates in agreement.
• Confirm financing if needed — have the budget before soliciting bids, not after.
• Check HOA architectural rules early; HOA denial after permit approval wastes both.

Phase 2: Permits and Approvals

• Confirm zoning: setbacks, lot coverage, height limits, and use restrictions — get answers in writing.
• Prepare or commission construction drawings to the building department’s requirements.
• Submit the building permit application with site plan and drawings; pay the application fee.
• Apply for the separate electrical permit (usually through the electrician).
• Respond to plan-review comments promptly; track the 2–8 week review window in your schedule.
• Receive the permit card — post it on site as required before any work begins.

Phase 3: Bidding and Contractor Selection

• Issue the identical written scope to at least three bidders; require itemized bids (slab, framing, roofing, siding, doors, electrical separated).
• Verify licenses and insurance; call references and, if possible, view past work.
• Scrutinize allowances — price actual selections against each allowance line.
• Sign a written contract: scope, price, payment schedule tied to milestones, start/completion windows, change-order procedure, warranty terms.
• Never pay in full up front; structure progress payments around completed phases.

Phase 4: Pre-Construction Site Prep

• Call the utility-locating service before any excavation is planned.
• Confirm electrical service capacity and panel space; schedule any service upgrade as its own project.
• Finalize material selections: door styles, siding color, roofing, lighting fixtures, outlet locations — decide now, not mid-build.
• Order long-lead items: trusses (2–3 weeks typical), custom doors, windows.
• Photograph the existing site conditions for your records.
• Establish site access, material storage, and debris handling with the contractor.

Phase 5: Construction — Verification Points

• Excavation and forms: verify dimensions, setbacks, and slab thickness before the pour; confirm reinforcement and vapor barrier placement.
• Slab pre-pour inspection: passed before concrete arrives — never pour over an uninspected base.
• Slab pour: confirm mix, thickness, control joint layout; protect the curing slab from traffic and rapid drying.
• Framing: verify wall heights, door opening sizes (against actual stock door dimensions), and roof pitch.
• Framing inspection: passed before insulation or siding covers the structure.
• Electrical rough-in: confirm every outlet, switch, light, and 240V circuit location while walls are open — this is the last cheap moment to add one.
• Electrical rough-in inspection: passed before insulation/drywall.
• Roofing: confirm underlayment, flashing, and ventilation details — not just the visible shingles or panels.
• Siding and trim: verify flashing at every penetration and proper clearances at grade.
• Doors and openers: test every door’s balance, safety reverse, and opener function before sign-off.
• Insulation/drywall (if finishing): insulation inspection before drywall where required.
• Grading and drainage: confirm water runs away from the slab on all sides; verify roof runoff routing.

Phase 6: Final Inspection and Closeout

• Walk a full punch list before calling the final inspection: paint touch-ups, caulking, hardware, cleanup, door operation, every light and outlet.
• Pass the final building and electrical inspections; obtain the certificate of completion/occupancy if your jurisdiction issues one.
• Collect warranties (roofing, doors, openers), manuals, and the contractor’s final lien waiver before releasing final payment.
• File all photos, permits, inspection records, and receipts in one project folder — future buyers, insurers, and your own future repairs will thank you.
• Release the final payment only after the punch list is complete and paperwork is in hand.
• Compare actual costs to the estimate line by line — that variance analysis is what makes the next estimate better.

Ongoing: First-Year Watch List

• After the first heavy rain, check for water intrusion at the slab edge and door thresholds.
• After the first seasonal cycle, check for slab cracks beyond normal hairline control-joint behavior and for siding or trim movement.
• Test door safety-reverse mechanisms every few months.
• Keep gutters and runoff routing clear — drainage maintenance is what protects the slab investment.

For the budgeting errors this checklist prevents, see the common mistakes guide; for money-saving sequencing during the build, the pro tips guide.

Keep a printed copy on site during construction — a checklist in a drawer helps nobody. Check off each verification point as it happens, note the date and who confirmed it, and you’ll have both a smoother build and a complete project record when it’s done.

Related Guides

• Garage Cost Complete Guide — the full overview with size tables and FAQ.
• Estimating Guide — build the budget this checklist executes.
• Code Compliance — permits and inspections in detail.
• Pro Tips — sequencing and savings during the build.
• Common Mistakes — what goes wrong when steps are skipped.

Get Your Number

A checklist only works if the numbers behind it are real. Build your line-item budget with the Garage Cost Calculator, then work this list phase by phase from written scope to final lien waiver. The most expensive garage problems — unpermitted work, uninspected cover-ups, forgotten rough-ins — are all checklist failures, and all preventable.

Disclaimer: Calculator results are planning estimates based on the dimensions and selections you enter. Actual garage construction costs vary with local labor markets, material prices, site conditions, and permit fees. Verify pricing with local suppliers and contractors, and consult a licensed professional or your local building authority for structural, electrical, and code-related decisions.