Buying or Building in McLean: Teardowns, Large Lots, Trees and Backyard Cottages
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Zoning, Grading Plans, Tree Canopy, Stream Buffers, Taxes and the Proposed Accessory Living Unit Rules, Explained for Buyers and Sellers
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Quick Answer: What Does It Take To Rebuild in McLean?
Last updated October 15, 2026.
Quick answer: replacing an older McLean house is a Fairfax County process, not a town one. Check the zoning district first (R-1 lots need at least 36,000 square feet), expect an infill lot grading plan if you disturb more than 2,500 square feet with stormwater measures, plan for the county’s 10-year tree canopy requirement and any Resource Protection Area along a stream, and budget for a higher assessment. A proposed county amendment, with hearings Oct. 29 and Nov. 17, 2026, could open detached backyard cottages to lots of 36,000 square feet or more.
Back to the Living in McLean, VA guide.
Named #1 Selling Realtor in Northern Virginia by Units Sold Since 2020
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The Rules That Shape a McLean Rebuild
| Step | What the county looks at | Where to check |
|---|---|---|
| Zoning district | Lot size, density, setbacks and height. In the R-1 district the minimum lot area is 36,000 square feet and density is one home per acre. | Zoning Ordinance, R-1 District and the county zoning map |
| Land disturbance | New single-family homes and additions that disturb more than 2,500 square feet need an infill lot grading plan; up to 5,000 square feet without stormwater facilities may use a conservation plan instead. | Infill Lot Grading Plans |
| Trees | Development sites must preserve or plant trees to meet the 10-year tree canopy requirement in Chapter 122 of the County Code. | Public Facilities Manual, Chapter 12 |
| Streams | Resource Protection Areas include land within 100 feet of protected water features and major floodplains; building there is limited. | RPA FAQs and guidance maps |
| Backyard cottage | Detached accessory living units currently need a lot of at least two acres; a proposed amendment would lower that to 36,000 square feet by right. | ALU amendment page |
Start With the Zoning District
Many McLean streets are zoned for single-family homes, but the district matters. In the R-1 district, the Zoning Ordinance sets a maximum density of one home per acre and a minimum lot area of 36,000 square feet, which is why two side-by-side older houses cannot always be replaced with three new ones. Before you pay a premium for “lot value,” confirm the zoning district, any proffers or special conditions, and whether the lot was created before or after current rules.
Height, setbacks and lot coverage also apply, and corner lots, pipestem lots and lots on private streets have their own quirks. Have a builder or land-use attorney read the plat before you commit.
Grading Plans, Stormwater and Tree Canopy
Fairfax County Land Development Services requires an infill lot grading plan for single-family construction that disturbs more than 2,500 square feet and includes stormwater management improvements. Smaller projects that disturb no more than 5,000 square feet and propose no stormwater facilities may use a conservation plan. New homes and large additions are also reviewed for the 10-year tree canopy requirement in Chapter 122 of the County Code, so mature trees on a lot can be an asset in the review, not just an obstacle.
Wooded stream valleys add another layer. Resource Protection Areas cover land within 100 feet of protected water features plus major floodplains, and development there is limited; lots subdivided after the ordinance dates can lose buildable area. Check the county’s RPA guidance map, then get a site-specific delineation if a stream is close.
Backyard Cottages (Accessory Living Units)
Today, a detached accessory living unit (ALU) in Fairfax County requires a lot of at least two acres. The staff report dated Sept. 29, 2026 proposes:
- allowing a detached ALU by right on lots of 36,000 square feet or more, with special permits for some smaller lots;
- keeping a 1,200-square-foot cap (or 40 percent of the main house, whichever is less), with larger sizes by special permit;
- a 35-foot height limit on lots of 36,000 square feet or more and 20 feet on smaller lots;
- removing the owner-occupancy requirement and the administrative permit for by-right units.
The Planning Commission hearing is Oct. 29, 2026 and the Board of Supervisors hearing is Nov. 17, 2026. Nothing changes until the Board adopts it, and the final text can differ. We will update this guide after the vote.
What a New House Does to Your Tax Bill
Fairfax County taxes the assessed value of land and buildings, so a new house generally raises the bill. For tax year 2026 the rates per $100 of assessed value are $1.12 (base real estate), $0.0325 (stormwater service district), $0.001 (infestation prevention) and, inside the McLean Community Center’s Small District 1A, $0.023. Check any home’s assessment on the county’s real estate site before you budget.
Before You Buy a Teardown or Large Lot
- Pull the plat, the zoning district and any recorded easements or covenants.
- Look up the parcel on the county’s RPA guidance map and FEMA’s flood maps.
- Confirm whether the lot is on public water and sewer or a private well and septic system.
- Have a builder price demolition, utility connections, tree work and stormwater measures before you settle on a land value.
- Check the FCPS boundary locator for the exact address; assignments can change.
- Search nearby parcels for pending rezonings in the county’s PLUS portal; see the development tracker.
Before You Sell an Older House on a Big Lot
- Price both ways: as a renovated or move-in home and as a lot. Nikki can pull Bright MLS sales for both kinds of buyers on your street.
- Gather permits, surveys, septic records and any tree or drainage work done over the years.
- Know your zoning district and whether the lot could be subdivided before you set a price; a land-use attorney can confirm.
Contact Nikki, call 703-596-5065 or text Nikki to talk through your lot.
More McLean Guides
- Living in McLean, VA: the full McLean guide
- McLean neighborhoods explained: downtown McLean vs. Langley vs. Chesterbrook vs. West McLean vs. Tysons
- McLean luxury homes: estates, custom builds and the $2M+ market
- McLean and Tysons development tracker
- McLean events calendar
- Great Falls Park, Scott’s Run and the Potomac Heritage Trail
Nearby area pages: Vienna, Falls Church, Arlington, Reston and Oakton, or see all areas served. Nikki’s results are on the Rankings & Data page. Questions? Contact Nikki, call 703-596-5065 or text Nikki.
McLean Building and Teardown FAQ
Do I need a grading plan to build a new house in McLean?
Usually. Fairfax County requires an infill lot grading plan for single-family construction that disturbs more than 2,500 square feet and includes stormwater management improvements. Smaller projects without stormwater facilities may use a conservation plan.
What is the minimum lot size in the R-1 district?
The Fairfax County Zoning Ordinance sets a minimum lot area of 36,000 square feet in the R-1 district, with a maximum density of one home per acre.
Can I build a backyard cottage in McLean?
Under current rules a detached accessory living unit needs a lot of at least two acres. A proposed amendment would allow one by right on lots of 36,000 square feet or more; hearings are Oct. 29 and Nov. 17, 2026.
What is a Resource Protection Area?
It is a regulated corridor along streams and other waterways under Fairfax County’s Chesapeake Bay Preservation Ordinance, including land within 100 feet of protected water features and major floodplains. Building inside an RPA is limited.
What is the real estate tax rate in McLean?
For tax year 2026, Fairfax County’s base rate is $1.12 per $100 of assessed value, plus $0.0325 for stormwater, $0.001 for infestation prevention and $0.023 for the McLean Community Center district.
Get in Touch With Your
McLean Real Estate Expert Today
Nikki Lagouros is your go-to real estate partner for buying or selling in McLean, VA. Schedule a consultation and start your journey toward a successful real estate experience.
Sources
Sources checked October 15, 2026.
- Fairfax County Land Development Services: Infill Lot Grading Plans; Chesapeake Bay Preservation Ordinance; FAQs: Resource Protection Areas; Public Facilities Manual, tree canopy
- Fairfax County Zoning Ordinance: R-1 District; Accessory Living Units proposed amendment and staff report (Sept. 29, 2026)
- Fairfax County Tax Administration: Real Estate Tax Rates
- Fairfax County Public Schools: Boundary Locator
- Hero photo: Georgetown Pike in McLean, by Famartin, CC BY-SA 4.0 via Wikimedia Commons.
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