Dormer cost guide
What does a dormer cost in Suffolk County?
Typical price ranges for shed, gable, and full second-story dormers — and the factors that move your number up or down. These are planning ranges, not quotes; your real price comes from an on-site estimate.
Free estimates · Serving Suffolk County, NY
Typical cost ranges by dormer type
Ranges shown are typical for Suffolk County and are for planning only. Your estimate depends on your home and the scope you choose.
Shed dormer (single room)
Mid-five to low-six figures
Most square footage for the dollar. Adds one full upstairs room; cost rises fast with plumbing for a bath.
Gable / doghouse dormer
Lower end of the dormer range
Smaller bump-out for windows and headroom. Keeps the roofline clean; adds less floor space.
Hip-to-gable / full second-story dormer
Low-six figures and up
Largest build — a full second floor. Driven by structure, stairs, plumbing, and full interior finish.
These are not quotes. Cost depends on your home's structure, your lot, your town's zoning, and the finishes you choose. Get a free on-site estimate for a number tied to your house.
What drives the price?
- Size of the dormer and added floor space
- New plumbing (a dormer bath adds meaningfully to cost)
- Roof tie-ins, structural reinforcement, and stairs
- Permitting and zoning review for your Suffolk County town
- Interior finishes — flooring, windows, trim, HVAC runs
Want a number for your house?
Tell us about your home and what you want to add. We'll connect you with local Suffolk County contractors for a free on-site estimate.
Get a free estimateQuestions & answers
Cost questions homeowners ask before calling.
Get a real number for your dormer.
Tell us about your home and goals. We'll connect you with local Suffolk County contractors and a free, no-pressure estimate.