Westchester County · build cost
What it costs to build a house in Westchester County, NY
A standard-finish new build in Westchester County runs about $242–318/sq ft all in - that is the number before you add a foundation, a hard site, or a winter pour. On a typical 1,800 sq ft build that is roughly $435k–570k, general-contractor margin included. Westchester County is the priciest county we model - it carries the highest labor and materials index of the group. The figures below come straight from the same cost engine Aldo uses to price a real parcel, broken out by system so you can see where the money goes.
Cost per square foot by finish level
All-in, general-contractor margin included, for a slab-on-grade build on a flat, clear lot. Per square foot holds steady whether you build 1,200 or 2,500 sq ft.
| Finish level | $ / sq ft | 1,800 sq ft total |
|---|---|---|
| Standard | $242–$318 | $435k–570k |
| Custom | $323–$481 | $580k–865k |
| Luxury | $493–$851 | $885k–1.53M |
Standard — Builder-grade but solid - stock cabinetry, mid-range windows, standard fixtures. What most spec cabins and rental builds run.
Custom — Better envelope, upgraded windows and doors, semi-custom millwork and fixtures. The typical Hudson Valley owner-build.
Luxury — High-performance envelope, custom cabinetry, designer fixtures and specialty finishes. Architect-driven, no stock parts.
Where the money goes
A standard-finish build in Westchester County, broken out by trade as dollars per square foot. Foundation and site work shown here are the slab / flat-lot baseline - see below for what a harder site adds.
| System | $ / sq ft |
|---|---|
| Site work | $9–$13 |
| Foundation | $19–$27 |
| Framing | $30–$38 |
| Envelope - roof, siding, windows | $38–$49 |
| Plumbing | $19–$24 |
| Electrical | $15–$19 |
| HVAC | $17–$22 |
| Insulation | $9–$11 |
| Interior finishes | $32–$43 |
| Millwork & cabinetry | $13–$19 |
What moves the number
The baseline assumes the easy case. Each of these stacks on top, per square foot, at Westchester County pricing:
- Crawlspace instead of slab+$16–23/sq ft
- Full basement instead of slab+$36–58/sq ft
- Moderately sloped or wooded lot+$10–19/sq ft
- Steep or ledge-rock site+$26–52/sq ft
- Winter foundation & site work+$3.4–4.8/sq ft
Whole-project totals
Standard finish, slab on a flat lot, all in. A harder site or a higher finish level moves these up - use the tables above to layer it in.
| Home size | Estimated total |
|---|---|
| 1,200 sq ft | $290k–380k |
| 1,800 sq ft | $435k–570k |
| 2,500 sq ft | $605k–795k |
Before you price it, check what you can build
Cost only matters once zoning says the build is allowed. See the districts, lot minimums, setbacks and short-term-rental rules for all 43 Westchester County municipalities before you run the numbers on a parcel.
Cost to build by town in Westchester County
The regional index above is county-wide, but the lot you have to buy to use it is not. Each town sets its own minimum lot size and coverage cap, and vacant land swings hard from one town line to the next, so the town pages carry the land cost and the zoning ceiling alongside the same build numbers.
ADU cost by town: Harrison (City) · Mount Vernon (City) · New Rochelle (City) · Peekskill (City) · Rye (City) · White Plains (City) · Yonkers (City) · Bedford · Cortlandt · Eastchester · Greenburgh · Lewisboro · Mamaroneck · Mount Pleasant · New Castle · North Castle · North Salem · Ossining · Pound Ridge · Somers · Yorktown · Ardsley (Village) · Briarcliff Manor (Village) · Bronxville (Village) · Buchanan (Village) · Croton-on-Hudson (Village) · Dobbs Ferry (Village) · Elmsford (Village) · Hastings-on-Hudson (Village) · Irvington (Village) · Larchmont (Village) · Mamaroneck (Village) · Mount Kisco (Village) · Ossining (Village) · Pelham (Village) · Pelham Manor (Village) · Pleasantville (Village) · Port Chester (Village) · Rye Brook (Village) · Scarsdale (Village) · Sleepy Hollow (Village) · Tarrytown (Village) · Tuckahoe (Village)
Sizing up a specific parcel in Westchester County?
Aldo pulls the exact zoning district, setbacks, and build feasibility for any parcel — before you buy. Enter your email to open Aldo and run your free report.
Build cost in other counties
Figures are modeled estimates from Offsite's construction cost engine, in current 2026 dollars, and include general-contractor margin. They are planning numbers for decision-support only - not a bid, quote, or guarantee. Actual cost depends on the specific parcel, design, site conditions, and market at the time you build. Get a real estimate before you commit. Source: Offsite / Aldo cost engine, costEngine.js + constants.js.