(Roof cost estimator)
What would a new roof cost?
Five questions give you a realistic guide price with every line shown. The fixed price comes after we have been on the roof, because decking and flashing are where estimates go wrong.
How big is the house?
The ground-floor footprint, including an attached garage if it shares the roof. Property records or your house plans usually give it.
How many stories?
Taller houses need more safety kit and longer hauls: +8% for two stories, +16% for three.
How steep is the roof?
Steeper roofs have more surface for the same footprint. If you could not walk on it comfortably, choose steep.
How many layers come off?
Look at the edge of the roof from a ladder: two sets of shingle edges means two layers. None is for new builds and bare decks.
Which material?
Guide installed rates per square (100 sq ft) before tear-off. The materials library explains each one.
(How it works)
Nothing hidden in the maths
The same formula runs the estimator on our homepage. Here it is, line by line.
- Roof area in squares
footprint × pitch × 1.12 ÷ 100, rounded up
Pitch adds surface: a medium roof has about 18% more area than its footprint. The 1.12 covers overhangs, and a square is 100 sq ft of roof.
- Materials and install
squares × rate × height factor
The rate is our guide installed price per square for the material. Two stories add 8%, three add 16%.
- Tear-off and disposal
squares × $90 × layers
Removing each existing layer down to the deck, plus the dumpster and tipping fees.
- Fixed costs
$650
Permit, dumpster delivery and a flashing kit. On every replacement, whatever the size.
- The range
midpoint −8% to +15%
Skewed upward on purpose: the things an estimate cannot see (rotten deck, extra chimneys) only ever add cost.
(After the inspection)
What the fixed price adds that this cannot
These are the lines that separate a guide price from a real one. They are all on our written scope, priced before you sign.
- Deck sheets
$88 each, only if needed, each one photographed
- Chimneys
From $640 each for new step and counter flashing
- Skylights
Reflash from $690, or replace from $1,850
- Missing soffit intake
$12–18 per foot
- Low-slope porch or dormer roofs
Membrane priced per square
- Gutters, if you want them done too
From $1,450
(Free inspection)
Turn the guide price into a fixed one.
Book a free inspection. The written scope follows within 48 hours, and there is no deposit until materials arrive.