Finishing a basement is one of the best ways to add living space without building an addition. One of the first questions homeowners ask us is whether they need a permit. The answer depends on which county you live in and what the project includes.
We’ve been finishing basements in Catonsville, Baltimore County and Howard County since 2000, and we pull the required permits for every project. Here’s a plain-language summary of what each county’s official pages say, with links so you can read them yourself.
Note: county rules change. Always check the official county pages linked below, or ask us, before starting work. This post is general information, not legal advice.
Baltimore County
Baltimore County has a page specifically for basement alteration permits. According to that page, a building (alteration) permit is required to:
- Add one or more basement bedrooms
- Excavate a basement
- Finish unfinished basement space if structural changes are involved or a bearing wall is moved
- Finish basement space if the property is in a flood zone, a historic district or the Chesapeake Bay Critical Area
The same page says that if none of those apply, a building permit is not required just to convert unfinished basement space into finished space.
There’s an important catch. The county also says that when plumbing, gas fitting or electrical work is involved, separate trade permits must be pulled by a Master Plumber or Electrician licensed with Baltimore County. Almost every finished basement includes new outlets, lighting or circuits, and many include a bathroom or wet bar. So even if you don’t need a building permit, you will very likely need electrical permits, plumbing permits, or both.
A few more points from the county’s pages:
- Bedrooms need a way out. The county’s basement page notes that basement bedrooms must have egress windows with prescribed openings and latches, or a door to the outside.
- Well and septic. If your home is on a well and septic system, a site plan meeting the county’s Ground Water Site Plan Requirements may be needed.
- Contractor license. The county’s addition and alteration permit page states that residential alterations by a private contractor require the contractor’s Maryland Home Improvement License number.
Applications are handled online. See Baltimore County’s Apply for a Permit page and its Building Inspections page.
Howard County
In Howard County, permits are handled by the Department of Inspections, Licenses and Permits (DILP). Howard County’s official residential building permit handout lists finishing a basement as an example of an interior alteration building permit. Its sample description includes a recreation room, a full bath, a bedroom with a new egress window, and a storage/utility room.
According to that handout, an interior alteration application asks for:
- The square footage of the work
- The number of bedrooms and bathrooms affected
- Water and sewer type (public, or well and septic)
- An existing floor plan and a proposed floor plan
- A plot plan if you’re adding new exterior windows or doors, such as an egress window
Applications are submitted through Howard County’s online DILP Citizen Access portal. You can find more on the county’s Inspections, Licenses & Permits page. Electrical and plumbing work have their own inspections in Howard County as well.
If you’re in Howard County and planning to finish a basement, plan on a permit and check with DILP for your specific project.
Why Permits Are Worth It
Permits can feel like a hassle, but they protect you:
- Safety. Inspections check wiring, plumbing, framing and egress, which matter even more in a space where people may sleep.
- Selling your home. Unpermitted finished space can cause problems when you sell, since buyers and their inspectors may ask about it.
- Insurance. If something goes wrong, you don’t want questions about whether the work was done to code.
What We Handle
When you hire Maryland Home Improvement Company to finish your basement, we:
- Look at your space and talk through how you want to use it
- Plan the layout, including egress windows for bedrooms
- Pull the required permits for your project and schedule inspections
- Handle the electrical work ourselves. Our owner is a Maryland Master Electrician (#12441)
- Handle the plumbing with a licensed plumber on our team
- Take care of framing, drywall, flooring, trim and paint
We’re a licensed Maryland home improvement contractor, MHIC #77900.
Planning a Basement Project?
Learn more about our finished basement services, or request a quote with a few photos of your space. You can also call or text (410) 719-9600. We serve Catonsville and homeowners throughout Baltimore County and Howard County.
