914 Basement Remodeling & Finishing Cost in Westchester, NY
Short answer
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.
Published cost ranges
| Item | Range | Source |
|---|---|---|
| Per square foot, White Plains (low / typical / high, modeled) | $26 / $52 / $84 | RenoVetted |
| 400 sq ft basement, White Plains (low / typical / high, modeled) | $10,468 / $20,936 / $33,498 | RenoVetted |
| 800 sq ft basement, White Plains (low / typical / high, modeled) | $20,936 / $41,872 / $66,995 | RenoVetted |
| 1,200 sq ft basement, White Plains (low / typical / high, modeled) | $31,404 / $62,808 / $100,493 | RenoVetted |
| Basic finish, per square foot (modeled) | $26 | RenoVetted |
| High-end finish, per square foot (modeled) | $83 | RenoVetted |
| Basement apartment, per square foot (modeled) | $104 | RenoVetted |
| Finishing a basement, per square foot (national) | $30 to $50 | HomeGuide |
| Total cost, 500 to 1,500 sq ft (national) | $15,000 to $75,000 | HomeGuide |
| 1,000 sq ft, open plan / three rooms (national) | $30,000 to $40,000 / $40,000 to $50,000 | HomeGuide |
| Basement bathroom addition (national) | $10,000 to $25,000 | HomeGuide |
| Egress window, installed (national) | $2,000 to $5,000 | HomeGuide |
| Building permit (national) | $200 to $1,000, or 1% to 2% of total cost | HomeGuide |
| Waterproofing as part of a finish (national) | $1,900 to $6,300 | HomeGuide |
These are published estimates retrieved October 2026, not quotes from 914 Basement. Your price depends on your house.
Modeled sources combine national cost data with a local labor factor (about 9% above the national average for White Plains and Yonkers); they are not surveys of Westchester bids. Actual quotes for Westchester homes, especially large houses, finished basements and hard-to-access sites, may be higher. Get written quotes.
What drives the price
- Finished square footage and number of rooms: an open plan costs less than several bedrooms and bathrooms
- Moisture control, waterproofing and drainage before walls and floors go in
- Plumbing for a bathroom or kitchenette, and electrical and HVAC changes
- Egress windows, ceiling height and stairs
- Flooring and finish level, from basic to high-end
- Permits, inspections and engineering if structure changes
Frequently asked questions
Why is there such a wide range?
Scope and finish level. RenoVetted shows basic, standard and high-end finishes at about $26, $52 and $83 per square foot in White Plains, and a basement apartment near $104.
Is waterproofing included?
Not always. HomeGuide lists waterproofing as a separate factor, so ask each bid whether drainage, a sump pump, insulation against the foundation and a dehumidifier are in or out.
Is the cheapest quote OK?
RenoVetted advises not comparing prices until scope, materials, cleanup, permits and warranty are included the same way in each written estimate.
Sources
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