Roof Replacement Timeline Checklist — Milestones from Contract to Completion

Your contract should specify: total price, material brand and product line (e.g., GAF Timberline HDZ in Charcoal), underlayment type, ventilation changes, flashing approach, number of layers being removed, warranty terms, and payment schedule. Never pay more than 30–40% upfront — the industry standard is a deposit at signing, a progress payment at tear-off completion, and final payment after inspection and walkthrough.

Popular shingle colors and specialty materials can have 2–4 week lead times, especially during peak roofing season (late spring through fall). Your contractor should confirm material availability before scheduling the start date. If your chosen color is backordered, decide early whether to wait or select an alternative — not after the crew is scheduled and the dumpster is on your driveway.

Permit processing times vary from same-day (small towns) to 2–3 weeks (busy metro areas). Your contractor should apply immediately after contract signing. Work cannot legally begin without an approved permit. Ask for the permit application number so you can check status with your building department if needed. Delays here are the most common reason projects start later than planned.

A roofing dumpster (typically 20–30 cubic yards) needs to be in place before the crew arrives. Confirm the delivery date, placement location, and any HOA or municipal restrictions on dumpster placement. Some neighborhoods require dumpsters to be off-street; others have time limits. Your contractor handles this, but knowing the schedule prevents surprises when a large dumpster appears on your property.

The crew (typically 4–8 workers for a residential roof) arrives with equipment: compressors, nail guns, safety harnesses, and hand tools. They'll stage materials, set up ladder access points, and install roof safety equipment. The first hour is setup — the noise starts in earnest when stripping begins. Material pallets may be crane-lifted to the roof if the contractor uses a boom truck.

The crew removes old shingles, underlayment, and flashing down to the bare wood sheathing. This is the loudest, dirtiest phase — debris slides and drops into the dumpster continuously. Once stripped, the foreman inspects the sheathing for rot, delamination, and structural damage. This is a critical decision point: rotted sheathing must be replaced before new roofing goes on, and this is an additional cost ($50–$100 per sheet of plywood).

Your contractor should show you any rotted or damaged sheathing and get verbal approval for the repair cost before proceeding. Most contracts include a per-sheet price for sheathing replacement, but the total depends on how many sheets need replacing — this is unknown until tear-off reveals the deck condition. Typical homes need 0–10 sheets replaced; neglected roofs may need more.

After sheathing repairs, the crew installs ice and water shield at eaves, valleys, and penetrations (required by code in most states for at least the first 3 feet from the eave). Synthetic underlayment covers the remaining deck. This creates a temporary waterproof layer — if the project spans multiple days, your roof is protected from rain at this stage. Most contractors will not leave a stripped roof overnight without underlayment.

Metal drip edge goes on first along the eave (under the underlayment) and rakes (over the underlayment). Starter strip shingles go along the eave and rakes to provide adhesive backing for the first course of field shingles. This foundation course determines the alignment for the entire roof — proper installation here prevents wavy shingle lines visible from the ground.

Shingles are installed from the eave up toward the ridge in staggered courses. A 4–6 person crew with nail guns can install 20–30 squares per day (a 'square' covers 100 square feet). A typical 2,000 sq ft home has 25–35 squares — often completable in a full day if weather and sheathing condition cooperate. The crew works in sections, completing one roof plane at a time.

Flashing is installed as shingle courses reach each penetration and transition point. This is the most skill-dependent part of the installation — poor flashing is the leading cause of leaks on new roofs. Watch for proper step flashing at walls (individual pieces woven with shingle courses, not a single bent piece), counter-flashing at chimneys, and properly layered boot flashing at vents.

Ridge cap shingles are installed last, covering the ridge vent (if used) and the peak where two roof planes meet. Ridge ventilation is critical for attic temperature and moisture control. If your old roof had inadequate ventilation, this is when upgrades happen — ridge vent installation, additional soffit vents, or powered ventilators. The ridge cap line is the most visible part of your roof from the ground.

The crew should run a magnetic roller across every surface within 30 feet of the house, including lawn, garden beds, sidewalks, and the street. A missed roofing nail will puncture a tire or injure a barefoot child. Run your own magnetic sweeper after the crew finishes — they're available at hardware stores for $20–$40 and are worth owning regardless.

Your permit requires a final inspection by the building department. The contractor should schedule this — but confirm it's been requested and track the inspection date. Building inspectors verify proper installation, code compliance, and ventilation. If the inspector identifies issues, your contractor corrects them at no additional cost. Do not make final payment until the building inspection passes.

Walk the entire perimeter and check: consistent shingle lines with no waviness, proper drip edge overhang (¼ to ¾ inch), clean ridge cap lines, sealed flashing at all penetrations, and no exposed nails or lifted shingle tabs. Check gutters for shingle debris and granule accumulation. Document anything that looks incorrect with photos before addressing with the contractor.

Before final payment, collect: the manufacturer warranty registration (or confirmation it's been submitted), contractor workmanship warranty, signed permit final inspection approval, and a lien waiver from the contractor confirming all subcontractors and suppliers have been paid. The lien waiver protects you from a material supplier placing a mechanic's lien on your property if the contractor doesn't pay their bills.