Cost breakdown
This estimate converts a 1,800 sq ft footprint into roof area using a standard pitch multiplier, adds a moderate waste factor, then applies the installed cost range for PVC Membrane. It is a planning range, not a contractor bid, but it gives homeowners a fast baseline before comparing local quotes.
PVC Membrane installed roof system
Low, average, and high allowance
$14,370–$31,135
Tear-off, disposal, and site cleanup
Low, average, and high allowance
$1,980–$4,950
Pipe/chimney/skylight flashing (2×)
Low, average, and high allowance
$300–$900
What 1,800 Sq Ft Means on a Roof
A 1,800 sq ft footprint is about 18 roofing squares. That is the unit roofers actually quote in, order in, and pay disposal by.
An 1,800 sq ft house is usually a ranch with an attached garage or an L-shaped footprint. That first valley and the garage-to-house transition are where the labor and the leak history live.
Waste factor
8-12%. The valley where the garage ties in eats material in cuts and salvage drops.
Tear-off and dumpster
One layer assumed. 18 squares calls for a 15-yard dumpster; valley debris and old flashing add bulk past what a 10-yarder holds. One haul covers it if the debris stays clean.
Crew and days (membrane)
3-4 person crew, 1-2 days
Schedule reality
Permit runs a few days to two weeks. Plan one to two install days for shingles and the inspection inside the following week.
Planning checklist at this size
- Watch the garage tie-in valley during tear-off. That junction catches water from two directions and is the most common rot spot on this footprint.
- Install new step flashing at the sidewall instead of reusing the old. The transition wall is where these roofs leak in year five.
- Keep a bundle allowance in the plan. L-shaped layouts burn more cap and starter than the square count suggests.
What changes the price?
Pitch and access
Steeper roofs require more safety setup, more labor time, and often more waste.
Tear-off layers
Old shingles, decking surprises, and disposal fees can move the final quote.
Valleys and penetrations
Chimneys, skylights, pipe boots, vents, and valleys add flashing detail and labor.
Material grade
PVC Membrane ranges widely by manufacturer, warranty, color, thickness, fasteners, and trim package.