Basement Finishing in PA & NJ

A finished basement adds a family room, office or rental unit inside walls you already own, as long as the water, the ceiling and the permit are handled first. Underhill Lions LLC handles basement finishing and basement remodeling across Philadelphia, Bucks and Montgomery Counties and South Jersey. Our own crew does the framing, insulation, drywall, flooring, trim and paint, and licensed partners handle the electrical and plumbing.

What a finished basement can be

Most basement jobs end up as one of a few things: a family room, a home office, a gym, a guest or in-law suite, or a rental-ready unit with its own bathroom. The use shapes the job more than the size does.

• Family room or office: mostly light, outlets, a good ceiling and a floor that can handle below-grade conditions.
• Gym: a durable floor and enough ceiling clearance where you will actually move.
• Bedroom or guest suite: an emergency exit, which usually means an egress window cut into the foundation.
• Rental unit: a bathroom, often a separate entrance, and the egress and ceiling-height rules that come with sleeping rooms.

Tell us at the walk-through what the space is for and we lay it out around that, not around a template.

Water comes first

We will not frame over an active leak. Drywall over a wet wall turns into a mold problem within a year, so every job starts with a moisture check of the walls, floor, sump and grading outside. If water is coming in, drainage or sealing has to happen before finish work, and we tell you that before we quote. A basement that is only a little damp is handled with framing set off the foundation, a vapor barrier and a floor chosen for it. The full list of what we look at before anyone frames a wall is in our basement finishing checklist.

Low ceilings, ducts and the main drain

Basements in older rowhomes and twins often have low joists with ductwork and the sewer line hanging below them. We measure every low point at the walk-through and plan the ceiling around them: a soffit boxed around the drain line, ducts moved toward the walls where possible, drywall where nothing needs to be reached, and drop-ceiling panels where a plumber needs access to a shutoff. The International Residential Code sets the finished ceiling heights for habitable space, and we check your basement against them before the layout is final, so nothing surprises you at inspection.

Built like a real floor of the house

A finished basement should read as another floor, not a cellar with carpet. That means framed and insulated walls, a proper ceiling, recessed lighting on its own circuit, outlets and switches by our licensed electrical partner, doors, trim and paint. A bathroom, wet bar or laundry goes in with our licensed plumbing partner under permit. The furnace, water heater and panel get a framed utility room with a door, with shutoffs left reachable.

For the floor, luxury vinyl plank is what we install most below grade: it handles moisture, feels warm enough and looks like wood. Tile suits a basement bathroom or laundry area. We do not put solid hardwood or glued-down carpet in a basement. Flooring is our own trade, and the same crew handles flooring installation upstairs too.

What drives the cost to finish a basement

We do not price a basement from square footage alone. The things that move the number most are:

• Water work needed before framing, if the moisture check finds any.
• A bathroom or wet bar, and how far it sits from the main drain.
• An egress window, since cutting into a foundation is real work.
• Mechanicals in the way: how much ductwork and piping has to be boxed in or rerouted.
• Finish choices: ceiling type, flooring, lighting and trim.

After the walk-through you get a written scope, so you can see what each choice adds before work starts.

Permits, partners and one crew

Finishing a basement is permitted work. We pull the permit under our license and schedule the rough and final inspections, and our licensed electrical and plumbing partners pull theirs. A permitted basement is also what lets the square footage count when you sell. Underhill Lions LLC is licensed and insured, PA HIC #PA203239, and based in Northeast Philadelphia. You can see our finished work on the projects page.

Thinking about your basement? Request a free estimate and we will walk the space, check for moisture and give you a layout to react to.