914 Basement Remodeling in Larchmont & Mamaroneck, NY
Larchmont and Mamaroneck are old and flood-conscious: the typical Larchmont home was built around 1940 (90% before 1980) and the typical Mamaroneck village home around 1953. Mamaroneck publishes its own flood-preparedness handbook. Westchester County requires home improvement contractors to hold a county license, and the county does not show license numbers in its public search, so we list the license expiry we found in the county's online search and note when a number comes from the company's own site. Plumbing and electrical work in a remodel may need separately licensed trades. Your town or village building department sets permit and inspection rules, so ask which permits apply before work starts.
Remodeling companies for Larchmont & Mamaroneck
How we pick: we list up to six companies per page. Independent firms come first, then firms based outside Westchester, then franchise or network affiliates. Companies that name the town as served come before those that serve the whole county. Listings are free, not paid, and not an endorsement. Home improvement license status was looked up in the Westchester County consumer license search on Oct 26 to 27, 2026, plumber license status in the county trade license search on Oct 27, 2026, and NYS mold license status in the state Labor Department data set; each profile shows what we found.
Luigi Building & Remodeling
No rating collected yetHome remodeling and basement construction
Ant's Do It All Construction
No rating collected yetResidential and commercial construction, basement renovations
Benjamin Rose Build & Design
No rating collected yetBasement remodeling and finishing, design-build
Fernandez Home Solutions
No rating collected yetGeneral contracting, basement remodeling, kitchens, baths, masonry
Riverview General Contractors
No rating collected yetBasement remodeling and finishing, kitchen and home remodeling, roofing
Sunrise Carpentry
No rating collected yetBasement finishing, carpentry, additions and remodeling
Housing in Larchmont & Mamaroneck
| Place | Typical year built | Built before 1950 | Built before 1980 | Median home value |
|---|---|---|---|---|
| Larchmont | 1940 | 63.5% | 89.7% | $1,635,500 |
| Mamaroneck | 1953 | 44.2% | 78.4% | $717,200 |
Source: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates (tables B25035, B25034, B25077), retrieved Oct 2026. Estimates carry a margin of error.
Flooding and water in Larchmont & Mamaroneck
- Westchester County’s Long Island Sound watershed program lists this municipality in the watershed study areas for “Blind, Beaver Swamp and Brentwood Brooks; Milton and Port Chester Harbors”, “Mamaroneck and Sheldrake Rivers; Mamaroneck Harbor”, “Pine and Stephenson Brooks; Larchmont Harbor”. [source]
- The Village of Mamaroneck describes itself as especially prone to flooding, sitting at the junction of the Mamaroneck River, the Sheldrake River, Beaver Swamp Brook, three watersheds, a 250-acre underground aquifer and Long Island Sound. [source]
- The state’s Mamaroneck River study found repeat flooding driven by undersized bridges and channels and tight development along the banks. [source]
- In Ida (September 2021), news reports described up to 14 feet of water in some Mamaroneck neighborhoods and basements filling to the first floor. [source]
Permit notes for Larchmont & Mamaroneck
From the municipality’s own pages, retrieved Oct 2026. Rules change, so call the building department before work starts.
- Larchmont: new sump pumps and drainage facilities need village permits; discharge should go to an owner-maintained dry well or detention basin. Discharging onto sidewalks or streets is not permitted and sump pumps may not connect to the sanitary sewer. [source]
- Mamaroneck: Local Law 2-2024 requires a plumber’s certification, by a plumber licensed to do business in Westchester County, covering sump pump discharge and sanitary sewer laterals. [source]
What it costs
A modeled estimate for White Plains puts basement finishing at $26 to $84 per square foot, with a planning midpoint near $52 (RenoVetted). For an 800 square foot basement that works out to about $41,872, with comparable bids roughly $20,936 to $66,995. Nationally, HomeGuide cites $30 to $50 per square foot, or $15,000 to $75,000 for 500 to 1,500 square feet. These are modeled and national figures, not Westchester bid data, and we did not find any Westchester contractor price lists. Full cost guide with sources.
Frequently asked questions
How many remodeling companies serve Larchmont & Mamaroneck?
We show 6 of 8 companies we found for Larchmont & Mamaroneck: 3 name Larchmont & Mamaroneck as an area they serve, and the rest serve all of Westchester County. Always confirm a company covers your address.
Does Larchmont & Mamaroneck require a permit for this work?
Often yes. See the permit notes on this page, then call the Larchmont & Mamaroneck building department before you sign a contract.
Do I need a permit to finish a basement?
HomeGuide says a permit is required before work begins and typically costs $200 to $1,000, though some places charge a percentage of project cost. Rules and fees are set locally, so ask your town or village building department.
Should I fix water problems before finishing?
Yes. A wet basement can ruin new flooring and drywall. RenoVetted's White Plains guide suggests asking about interior drainage, rigid foam against the foundation and a dehumidifier, and lists waterproofing among typical basement finishing costs.
Nearby
Sources
- Westchester County Planning: Long Island Sound Watershed Program (watershed study areas by municipality)
- Village of Mamaroneck Building Department: Flood Preparedness Handbook
- NYS DEC / Village of Mamaroneck: Mamaroneck River Flood & Resiliency Study Report (2023)
- ABC7 New York: Ida damage, 14 feet of water in Mamaroneck (Sept. 2, 2021)
- Village of Larchmont Building Department: Sump Pumps
- Village of Mamaroneck: Local Law 2-2024 (plumber’s certification for sanitary sewer laterals)
- U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, tables B25034, B25035, B25077 (via Census Reporter)
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