Finished basement in Maryland by K & S Construction

Basement Finishing

Basement Finishing & Remodeling Across Baltimore, Carroll & Howard County

Add a full living level to your home. K & S finishes basements throughout Maryland with the same craftsmanship we put into the rooms above — proper framing, full code-compliant electrical, real bathrooms, and the trim work that makes a basement feel like part of the house instead of an afterthought.

What we build in Maryland basements

A finished basement is one of the highest ROI projects you can take on. Done right, it adds 600–1,500+ square feet of livable space without the cost of an addition. Done wrong, it traps moisture, fails inspection, or looks like a garage. We build basements the right way — from the framing schedule and vapor barriers to the lighting plan and trim detail.

  • Open rec rooms and family rooms
  • Full basement bathrooms and powder rooms
  • In-law suites and basement apartments
  • Home theaters and bars
  • Home offices and gyms
  • Bedroom suites with egress windows
  • Storage rooms, laundry rooms, and mechanical rooms

Code, permits, and inspections

Maryland basement projects involve framing, electrical, plumbing, and egress inspections — sometimes structural, depending on the home. We pull the permits in Baltimore County, Carroll County, or Howard County, coordinate the inspectors, and make sure the project closes out clean.

Waterproofing first — finishing second

If a basement has any history of water, we address it before we frame a single stud. That means proper drainage at the perimeter, sealing where needed, sump-pump verification, and vapor barriers behind framed walls. Skipping this step is the #1 reason finished basements fail; we don't skip it.

Process

Walkthrough. We assess moisture, ceiling height, mechanicals, and existing framing.

Layout & estimate. Itemized written estimate with allowances for bath, bar, flooring, doors, lighting.

Permits. We pull them.

Build. 5–8 weeks typical for a fully finished basement.

Inspections & final walkthrough.

Service area

We finish basements throughout Towson, Cockeysville, Timonium, Perry Hall, Reisterstown, Owings Mills, Westminster, Sykesville, Eldersburg, Ellicott City, and Catonsville.

FAQ

Frequently Asked Questions

How much does basement finishing cost in Carroll County or Baltimore County?

Most fully-finished basements we complete run $45,000–$120,000 depending on square footage, ceiling height, and whether the project includes a bathroom, bar, or in-law suite. Open rec-room finishes with no bath start lower; basement apartments and full in-law suites can run higher.

Do I need a permit to finish my basement in Maryland?

Yes — Baltimore County, Carroll County, and Howard County all require permits for finishing a basement (framing, electrical, plumbing, and egress). We pull the permits and coordinate inspections so you don't have to.

Can you add a bathroom in the basement?

Yes. We add full and half baths in basements regularly. Where there's already a rough-in, the cost is much lower; where we need to break the slab and tie into the main line or install an ejector pit, the cost is higher but very doable.

How long does basement finishing take?

Typical finished basements run 5–8 weeks on site. Bathrooms, bars, and in-law suites add time depending on scope.

What about egress windows and code compliance?

Any basement bedroom requires a code-compliant egress window. We handle the excavation, window install, framing, and waterproofing as part of the project.

Service Area

Areas We Serve Across Maryland

Family-owned remodeling contractor serving Baltimore County, Carroll County, Howard County, and surrounding communities — kitchen, bath, basement, and whole-home renovations done by our own team.

Don't see your town? We work throughout the greater Baltimore metro — ask if we cover your area.

Ready When You Are

Turn the basement into your favorite room.

Free, no-pressure estimates. Speak directly with Chris the owner/contractor who will personally handle your project from start to finish.