Buying a home in a historic district in Montgomery County means every exterior change — windows, porches, additions, demolition — needs a Historic Area Work Permit, heard by the Historic Preservation Commission within 45 days. There's no HAWP fee, interior work is exempt, and approved exterior restoration earns a 25% county tax credit.
If you're under contract on a 1920s cottage in Kensington, a Victorian in Garrett Park, or a shingled house in Chevy Chase Village, there's a question worth answering before your inspection contingency expires: is this house inside a designated historic district — and if it is, what are you actually allowed to do to it?
The answer changes what you'll spend, how long your renovation takes, and in some cases whether the project you're picturing is possible at all.
Here's the honest version. Buying a home in a historic district in Montgomery County does not stop you from renovating. It changes what gets reviewed, who reviews it, and how long it takes. Buyers who understand the rules going in are usually fine. The ones who get hurt are the ones who found out at the permit counter, six weeks after settlement, with a contractor already booked.
What Buying a Home in a Historic District Actually Restricts
Montgomery County adopted its Historic Preservation Ordinance — Chapter 24A of the County Code — in 1979, along with the Master Plan for Historic Preservation. If your property is a designated historic site or sits inside a designated historic district, exterior work requires a Historic Area Work Permit (HAWP) reviewed by the county's Historic Preservation Commission (HPC).
What triggers a HAWP:
- Additions and any change to the building's footprint
- Removing or replacing character-defining elements — windows, doors, porches, steps, shutters, and decorative trim
- Demolition or moving a structure
- Changes to the environmental setting — driveways, fences, and significant landscape features, depending on the district
What doesn't:
- All interior work. Gut the kitchen, redo the baths, finish the basement, replace the HVAC — none of it goes to the HPC.
- Ordinary maintenance in the same materials. Painting wood surfaces, repairing a porch, replacing a roof with the same material.
The process itself is faster than most buyers expect. You file the HAWP application with the Department of Permitting Services, preservation staff review it, and the HPC hears it at a public hearing — typically within about three weeks and no more than 45 days after filing. There is no fee for the HAWP (you still pay standard building permit fees). If the Commission denies your application or attaches conditions you can't live with, you can appeal to the Board of Appeals.
So the real cost isn't the permit. It's two things: time and design. Add roughly one to three months to the front end of any exterior project for drawings and the hearing cycle. And expect the Commission to push back on the change most buyers want most — swapping original wood windows for vinyl. Repair, restoration, or wood replacements that match the original profiles are the usual outcome. That's a real budget difference, and it belongs in your numbers before you write the offer, not after.
National Register Listing and County Designation Are Not the Same Thing
This is the confusion that costs people money in both directions — and it's the single most useful thing to understand here.
The National Register of Historic Places is a federal listing. It's largely honorific. It does not restrict what you do to your own house with your own money. What it does is unlock access to state rehabilitation tax credits.
The Montgomery County Master Plan for Historic Preservation is the local designation with teeth. That's the one that triggers HAWP review.
Carderock Springs — the 275-home modernist neighborhood northwest of Bethesda, built between 1962 and 1966 — is the perfect example. It's been on the National Register since 2008, which is why plenty of people assume it's regulated. It isn't. It is not currently designated in the county's Master Plan for Historic Preservation. But in October 2025, the Carderock Springs Citizens Association asked Montgomery Planning to study the neighborhood for county designation. If that moves forward, the rules change for every house in it — including the one you might be buying this year.
There's one more layer worth knowing. In 1976, M-NCPPC created the Locational Atlas & Index of Historic Sites, a list of resources identified as potentially historic. Properties on the Atlas are protected from demolition and substantial alteration under Chapter 24A even though they have not been formally designated. So a house can be "not in a historic district" and still not be freely demolishable. If your plan involves a teardown or a major addition, check the Atlas — not just the Master Plan.
The Tax Credits That Offset the Rules
Historic designation gives something back, and it's usually undersold by the listing agent.
Montgomery County historic preservation tax credit. Worth 25% of qualified exterior restoration and preservation expenses, applied against your county real property tax bill. The Council raised it from 10% to 25% for eligible work completed after January 1, 2013. Exterior work only; no credit for new construction. The work has to be covered by an approved HAWP — or qualify as ordinary maintenance where you spend more than $1,000. The credit is capped each year at your county real property tax amount, and any unused portion carries forward for up to five years.
Maryland Historical Trust Homeowner Tax Credit. A 20% state income tax credit on eligible rehabilitation expenses, with a $5,000 minimum spend and a cap of $50,000 in credit over a 24-month period. You have to own and occupy the home, it has to be a certified historic structure, and — this is the part people miss — MHT must approve the work before it starts. Start first, and the credit is gone.
The two stack. On a $60,000 exterior restoration under an approved HAWP, that's a $15,000 county credit against property taxes plus a $12,000 state income tax credit. In a market where Bethesda-area homes run $700,000 to $2 million and Montgomery County property tax bills land harder than most buyers expect, a five-figure credit carried forward five years is not a rounding error. It's also money the buyer two streets over, outside the district, will never see.
How to Check a Property Before You Write the Offer
Buying a home in a historic district is a due-diligence question, and it's answerable in an afternoon.
- Look the address up on the county's historic preservation map (mcatlas.org/hp2). It shows Master Plan historic sites and districts and Locational Atlas resources. Do this before you tour a second time, not after you're ratified.
- Check the municipality separately. Chevy Chase Village, the Town of Chevy Chase, Kensington, and Garrett Park can impose building requirements stricter than county zoning — fences, walls, hedges, setbacks, and the location of structures. County HAWP approval is not municipal approval. They are two different lines to stand in.
- Read the disclosures, but don't rely on them. The Maryland Residential Property Disclosure and Disclaimer Statement is a useful document, and designation is public record either way. Verify it yourself.
- Price the plan, not just the house. If your offer quietly assumes a rear addition and 22 new windows, get an architect who has actually presented to the HPC to sanity-check the concept while your contingencies are still alive.
- Build the timeline into your contingency period. You will not get a HAWP approved inside a 10-day inspection window. You can absolutely find out in that window whether what you want to build is realistic — and that's the decision that matters.
This is exactly the kind of question I walk buyers through before we go under contract, because the cost of getting it wrong shows up as a renovation that can't happen, not as a line item on the settlement sheet.
A historic district is not a trap, and buying a home in a historic district isn't a mistake. For a lot of buyers it's the reason the street looks the way it does — and the reason it will still look that way in twenty years. But it's a set of rules you should choose on purpose, with your renovation plan and your budget already tested against them.
If you're weighing a home in Kensington, Garrett Park, Chevy Chase Village, Takoma Park, or anywhere else in Montgomery County where designation might be in play, I'm happy to pull the record and walk through what it means for what you want to do. Reach out anytime.
About Pey Behin
Pey Behin is a residential real estate agent serving the Washington, DC metro area, with a focus on Bethesda, Montgomery County, and Northern Virginia. He works with buyers and sellers who want clear strategy, data-driven pricing, and direct guidance throughout the transaction process.