Home / Roofing Calculators / New Roof Installation Cost Calculator
🏗️ New Roof Installation Cost Calculator
Estimate new roof installation cost for new construction — by house size, roof material, pitch complexity, and decking type
Who Should Use This
New home builders, custom home buyers, and contractors estimating roofing costs for new construction projects.
Purpose
Calculate cost of roofing a new home including decking, underlayment, shingles, ridge cap, and flashing — without tear-off costs.
Example
A 2,000 sq ft home footprint with 6/12 pitch and architectural shingles costs roughly $7,000–$12,000 for new installation — about $3.50–$6/sq ft of roof area.
New Installation Details
💡 Builder Tip: On new construction, roofing is typically bid per square (100 sq ft). Architectural shingles at 4/12–6/12 pitch are the most cost-effective choice for most residential builds.
Installation Cost Estimate
Total Installation Cost
$— – $—
— sq ft roof area
Cost Per Roofing Square
$— – $—
Per 100 sq ft of roof area
Cost Breakdown
Roof Decking (OSB/Plywood)$—
Underlayment & Ice Shield$—
Roofing Material$—
Installation Labor$—
Flashing & Ridge Cap$—
Roof Details
House Footprint—
Actual Roof Area—
Roofing Squares—
How It Works
4 Steps to Your New Roof Estimate
1
Enter House Size
Input your home's footprint dimensions to calculate total roof area.
2
Select Pitch & Complexity
Choose your roof pitch and complexity — simple gable or complex multi-valley design.
3
Choose Materials
Pick roofing material and decking type for accurate material cost estimates.
4
Get Full Estimate
See complete breakdown of decking, underlayment, material, labor, and flashing costs.
New Construction vs. Replacement
New construction roofing is typically 15–25% cheaper than replacement roofing because there's no tear-off cost, no disposal fees, and the fresh decking is clean and ready to work on. Contractors can work more efficiently without the constraints of an occupied home.
The biggest cost variable in new construction is roof complexity. A simple gable roof over a rectangular home is the most economical. Each additional valley, dormer, turret, or change in pitch adds material waste and labor time.
What's Included in New Installation
- Roof decking: OSB or plywood sheathing nailed to trusses/rafters
- Drip edge: Metal edge flashing around all eaves and rakes
- Ice and water shield: In valleys and eaves (first 3–6 ft)
- Synthetic underlayment: Over entire deck surface
- Roofing material: Shingles, metal panels, or tile
- Ridge cap: Seals the peak of the roof
- Flashing: Around any penetrations — chimneys, vents, walls
Builder's Guide
New Construction Roofing Tips
Material selection, timing, and contractor tips for new builds
📋
Spec the Right Material
Architectural shingles are the builder's standard — they offer the best value, long warranty, and wide style selection. Upgrade to metal if the budget allows — the lifetime savings in maintenance and longevity often justify the premium on a new build.
⏱️
Timing is Critical
Roofing must be completed before interior work begins. Poor scheduling delays framing, HVAC, electrical, and insulation crews. Coordinate roofing contractor availability early — top crews book 4–8 weeks ahead in busy seasons.
🔍
Decking Quality
Don't skimp on decking thickness — 7/16" OSB is builder-grade minimum. 5/8" OSB or 3/4" plywood provides better fastener holding for shingles and is required by some metal roofing systems. Upgrade for tile or slate.
🌬️
Attic Ventilation
Proper ventilation extends shingle life by 5–10 years and reduces cooling costs. Code requires 1 sq ft of vent area per 150 sq ft of attic. Balance ridge vents with soffit vents for optimal airflow — don't mix ventilation types.
📝
Get Itemized Bids
Request bids broken down by: material cost, labor, decking, underlayment, and flashing. This lets you compare apples-to-apples between contractors and identify where savings can be made without compromising quality.
🏆
Warranty Matters
Choose manufacturer-certified installers for the best warranty coverage. GAF Master Elite and Owens Corning Preferred contractors can offer 50-year system warranties. Always get a written workmanship warranty of 5+ years.
Common Questions
New Roof Installation FAQ
Roofing is installed immediately after the roof decking (sheathing) is nailed to the trusses or rafters. The typical sequence is:
- Foundation → Framing → Roof trusses/rafters → Roof decking → Roofing installation
- After roofing: Windows and doors, then interior rough-in (HVAC, plumbing, electrical)
- Getting the roof "dried in" quickly is critical — it protects the entire structure from weather
The most common and cost-effective residential roof pitch is 4/12–6/12 (rises 4–6 inches per foot of horizontal run). Reasons:
- Compatible with all shingle types at these pitches
- Good water drainage without being excessively steep
- Moderate attic space for insulation and ventilation
- Workers can walk without fall protection in most states (below 6/12)
- Steeper pitches look dramatic but significantly increase labor cost
Both are code-compliant for most applications. Comparison:
- OSB: Less expensive ($8–$12/sheet vs $18–$25 for plywood), performs well when dry, standard in production homes. Swells if repeatedly wet before roofing is installed.
- Plywood: More moisture-resistant, holds fasteners better, preferred for tile, slate, and metal roofing systems. Worth the premium in wet climates or for premium roofing materials.
Keep Exploring
Related Roofing Calculators
More tools for your roofing project