Basement Renovation Cost in Yonkers, NY: 2026 Price Guide

Serving Yonkers and all of Westchester County

If you’re considering a basement renovation in Yonkers or elsewhere in Westchester County, the starting condition of your basement matters as much as the finishes you choose. Here’s a realistic breakdown of what to expect.

Basement Renovation Cost by Finish Level

For a typical 1,000 square foot basement, that works out to roughly $30,000 to $80,000 depending on finish level, though smaller basements naturally cost less in total even at the same per-square-foot rate.

Why Starting Condition Matters So Much

A completely unfinished basement, meaning bare concrete, no framing, and no existing electrical or plumbing rough-in, requires the most work and sits at the higher end of the cost range. A partially finished basement that already has some drywall, flooring, or basic utilities in place typically costs less to complete, since some of the foundational work is already done. Before you budget a project, it’s worth having a contractor assess exactly what condition your basement is starting from rather than assuming a number from a general guide.

What Drives Basement Renovation Costs

Moisture and Waterproofing

Basements in older Westchester homes often need moisture control addressed before any finish work makes sense. Skipping this step to save money upfront is one of the most common reasons a basement renovation needs expensive rework later.

Egress Windows

If you want a basement bedroom or plan to use the space as a legal living area, most towns require an egress window for safety and code compliance. Adding one where none exists is a meaningful line item, but it’s often necessary rather than optional depending on how you plan to use the space.

Electrical and Plumbing

Adding a bathroom, wet bar, or extensive lighting circuits to a basement that doesn’t already have the rough-in for it adds cost beyond the basic per-square-foot finish numbers above.

Permits

Basement renovations that add living space, a bathroom, or electrical work typically require permits. Budget for permit fees and factor in lead time, since requirements and timelines vary by Westchester town.

Popular Basement Upgrades

In-Law Suite or Guest Suite

Adding a bedroom, full bathroom, and small kitchenette or wet bar turns a basement into a self-contained living space, useful for multigenerational households or rental potential. This is one of the more involved basement projects since it typically requires an egress window, full electrical and plumbing rough-in, and depending on scope, may need to meet additional code requirements for a legal secondary living unit.

Home Theater or Media Room

Basements are naturally suited to home theaters since they’re already enclosed and typically quieter than above-grade rooms. Costs here vary widely based on how much audio-visual equipment and custom seating are included, on top of the base finish work.

Home Gym

A basement home gym is one of the more budget-friendly upgrades, often needing little beyond flooring suited to equipment use, mirrors, and adequate ventilation, without the plumbing costs a bathroom or wet bar would add.

Wet Bar or Entertainment Space

A wet bar adds plumbing to a specific corner of the basement rather than the whole space, which keeps costs more contained than a full kitchenette while still adding a meaningful entertaining feature.

How Long Does a Basement Renovation Take

A basic finish (framing, drywall, flooring, basic electrical) on an average-size basement typically takes 3 to 6 weeks. Mid-range projects with a bathroom rough-in often run 6 to 10 weeks. High-end projects involving full waterproofing, egress windows, and custom layouts can take 10 to 16 weeks or longer, especially when permits and inspections are factored into the schedule.

Getting an Accurate Number for Your Basement

These figures are a starting point, not a fixed quote. The real cost for your project depends on your basement’s current condition, ceiling height, moisture history, and what you want the finished space to do. An in-person walkthrough is the only reliable way to get a number you can actually plan around.