Buying a Teardown or Lot in Arlington or Fairfax: Costs and Due Diligence

Buying a teardown or vacant lot in Arlington or Fairfax County can work well, but only if you verify what you can build and what it will cost before you are committed. The key due diligence items are zoning and setbacks, lot coverage, easements and title, stormwater and grading requirements, trees, soils, floodplain and utilities, plus a realistic all-in budget. Here is the checklist I walk buyers through, along with the local rules that tend to surprise people.

Why buyers look at teardowns here

Close-in neighborhoods in Arlington and eastern Fairfax County are largely built out, so a modest older house on a good lot is often the only way to get new construction on a particular street. Builders compete for the same properties, which is why some owners consider selling to a builder directly. As an individual buyer, you are up against people who estimate costs for a living, so your homework needs to be just as good.

The due diligence checklist

Item	What to check	Who helps
Zoning district	Minimum lot size, setbacks, height limits, lot coverage and allowed uses	County zoning office, your architect
Survey and title	Boundaries, easements, rights of way, covenants, encroachments	Surveyor, title company, real estate attorney
Stormwater and grading	Whether a grading or land disturbance plan is required and what detention it will need	Civil engineer
Trees	Tree preservation, canopy or replacement requirements, protected trees near the line	Arborist, engineer
Floodplain and Resource Protection Areas	Mapped floodplain, streams and Chesapeake Bay buffers that limit where you can build	Engineer, county GIS
Utilities	Public water and sewer availability, connection or availability fees, electric service relocation	Utility providers, builder
Soils	Marine clay, rock, fill or high groundwater that affects foundations	Geotechnical engineer
Demolition	Permit, utility disconnections, hazardous material survey where required	Demolition contractor, builder

Arlington specifics

• Zoning. Most single-family neighborhoods are zoned R-5, R-6, R-8, R-10 or R-20, with minimum lot sizes in square feet matching the number (R-6 means 6,000 square feet, for example). Lot coverage limits cap how much of the lot buildings and paved areas can occupy.
• Land disturbance permit. Arlington requires a Land Disturbing Activity / Stormwater permit when total disturbance reaches 2,500 square feet or more, which covers nearly every new house. Single-family projects must meet state stormwater quantity and quality standards and avoid pushing runoff onto downhill neighbors.
• Expanded Housing Option zoning. Arlington’s rules allowing some multi-unit buildings on lots that were single-family only have been tied up in litigation since 2024, and their status has shifted with court rulings. If your plan depends on building more than one unit, confirm the current status with the county’s zoning office before you rely on it.
• Trees and drainage. Expect your engineer to address existing trees, grading and drainage as part of the plan review.

Fairfax County specifics

• Zoning. Residential districts vary widely, from large-lot R-1 to denser districts, and some neighborhoods carry proffers or older subdivision conditions recorded with the plat.
• Infill lot grading plan. A new single-family home or addition that disturbs more than 2,500 square feet of land needs an infill lot grading plan with stormwater management, often using the county’s standardized detention methods such as rain gardens, planter boxes or underground pipes.
• Resource Protection Areas. Lots near perennial streams may include a protected buffer where building is restricted under the county’s Chesapeake Bay preservation rules.
• Tree conservation. Plans typically must show how the site will meet tree canopy requirements, which can mean preserving existing trees or planting new ones.

Budgeting the whole project

The purchase price is only the first line. A realistic budget includes:

1. Lot or teardown price, plus buyer closing costs.
2. Survey, design, civil engineering and geotechnical work.
3. Demolition and hauling, plus utility disconnects.
4. Permit and plan review fees.
5. Water and sewer connection or availability fees, and any electric service relocation.
6. Stormwater facilities required by the approved plan.
7. Construction, including a contingency for surprises (many builders suggest 10% or more).
8. Construction loan interest and carrying costs while nothing is livable.
9. Temporary housing if you are moving out of a current home.

Lot and construction loans generally require larger down payments and stronger reserves than a standard purchase. Talk to a lender who regularly closes construction-to-permanent loans before you write an offer, and compare the full cash picture with our post on how much cash you need to buy.

A worked example

These numbers are purely illustrative, not quotes or a real project. A buyer pays $900,000 for a small 1940s house on a 6,000 square foot Arlington lot planning to tear down and build.

Line item	Illustrative amount
Purchase price	$900,000
Buyer closing costs	$20,000
Design, survey, engineering	$60,000
Demolition and utility disconnects	$40,000
Permits, fees, utility connections	$45,000
Construction (including stormwater facilities)	$900,000
Contingency	$90,000
Carrying costs during the build	$75,000
Illustrative total	$2,130,000

The real question is whether the finished home would be worth comfortably more than that total in its neighborhood. Run those figures through the deal analysis tool and check recent new construction sales nearby before committing.

Common mistakes

• Signing without a feasibility contingency, or with one too short to get engineering input.
• Assuming the existing footprint can be rebuilt larger without checking setbacks and lot coverage.
• Missing an easement, sewer line or stream buffer that cuts through the buildable area.
• Underestimating stormwater and utility costs.
• Hiring a builder before checking their license, insurance and completed projects.
• Counting on multi-unit zoning that is in litigation or not available on that lot.

Considering a renovation instead? Compare with my posts on renovations that add value and accessory dwelling units. A Virginia real estate attorney should review any lot purchase contract with unusual title or zoning conditions.

Frequently asked questions

Do I need a permit to tear down a house in Arlington or Fairfax County?

Yes. Demolition requires a permit, utility disconnections and, for the new house, an approved grading or land disturbance plan when disturbance reaches the 2,500 square foot threshold.

How long does it take to build on a teardown lot?

It varies a lot. Design, engineering and plan approval can take several months before construction starts, and building a custom home often takes a year or more.

Can I get a mortgage to buy a teardown?

Many buyers use a lot loan or a construction-to-permanent loan rather than a standard mortgage, because the existing house may not meet lender property standards. Expect a larger down payment.

What is a feasibility study contingency?

It is a contract contingency that gives you a set period to investigate zoning, survey, engineering and costs, and to cancel if the project doesn’t work.