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Decks & Porches — Northern Virginia
Decks & Porches Engineered to Outlast the Warranty
Composite, hardwood, and screened porches built to Northern Virginia code — proper footings, permitted framing, hidden fasteners, and finishes engineered for wet springs, hot summers, and freezing winters.
The Short Answer
A standard pressure-treated or composite deck in Northern Virginia runs $45–$65 per square foot, a premium composite build with upgraded railings and lighting runs $65–$95 per square foot, and a fully screened porch with a roof structure runs $95–$200+ per square foot. Virtually every attached deck in Fairfax, Loudoun, Arlington, and Prince William County requires a building permit and inspection — footings must bear on solid ground at least 24 inches below grade, and guardrails are required once the deck surface sits more than 30 inches above grade. Most single-project builds take 1–3 weeks of on-site construction once permits clear, with 4–8 weeks of lead time recommended for design and permit approval ahead of your target season.
Every Deck & Porch Build, Handled In-House
From a simple grilling deck to a four-season porch with electric, ceiling fans, and a fireplace — design, permitting, framing, and finish are all handled by our own crew, not subcontracted out.
- Engineered footings sized and poured to county code, inspected before framing starts
- Permits & HOA review pulled and managed for you, county-by-county
- Hidden-fastener decking in Trex, TimberTech, Fiberon, cedar, or IPE
- Code-compliant railings including cable, aluminum, or composite baluster systems
- Screened & three-season porches with roof structures tied into existing framing
- Final inspection & care guide so you know exactly how to maintain the finish
How We Work
From First Call to Finished Build
A clear, three-step process — no surprises, no subcontractor shuffle.
On-Site Walkthrough
We measure your space, review code and HOA requirements, and talk through material tiers and layout options.
Line-Item Quote
A written, itemized quote in your inbox within 24–48 hours, plus a permit and timeline plan.
Build & Inspection
Footings, framing, decking, railing, and trim — completed by our crew, then walked through with you at final inspection.
Local Knowledge
What Northern Virginia Homeowners Should Know
- Permits are the rule, not the exceptionAny deck attached to the house, over roughly 200 sq ft (256 sq ft in Loudoun), or more than 16–18 inches above grade requires a county building permit and inspection in Fairfax, Loudoun, and Prince William County.
- Footing depth is code, not a preferenceFootings must bear on solid ground at least 24 inches below grade in Fairfax County, verified by an inspector before concrete is poured — and if a footing sits within 5 feet of the house, it must match the home's existing footing elevation.
- Guardrail height is enforcedAny deck or porch surface more than 30 inches above grade requires a guardrail at least 36 inches high, with baluster spacing that won't pass a 4-inch sphere — inspectors check this at final.
- HOA review runs in parallel with permittingCommunities across Loudoun, Fairfax, and Prince William County (Brambleton, South Riding, Broadlands, and similar HOAs) require architectural review before county permits are pulled — we submit both at once so your timeline doesn't stack up.
- Plan around plan review lead timeCounty plan review typically runs 2–4 weeks once submitted; we recommend budgeting 4–8 weeks total from design sign-off to permit-in-hand ahead of your target build season.
Why Lawn Theory
Built By the Crew That Signs the Permit
Permits Handled In-House
We pull every county and HOA permit ourselves — no waiting on a subcontractor to file paperwork.
Engineered Footings
Every footing is sized for its span and verified by inspection before a board goes down.
Premium Material Partners
Trex, TimberTech, Fiberon composite, plus cedar, mahogany, and IPE hardwoods.
Written Quotes, Fast
Line-item pricing delivered within 24–48 hours of your walkthrough — no vague estimates.
Where We Build
Proudly Serving Five Northern Virginia Counties
Every county has its own dedicated Decks & Porches page. Pick a county to see the areas we serve.
Serving Fairfax County
What Homeowners Say
Real Projects, Real Reviews
"They pulled the Fairfax County permit, scheduled the footing inspection, and never once made us chase the paperwork ourselves. Our screened porch has held up through two humid summers with zero issues."
"We got three quotes and Lawn Theory's was the only one that actually explained footing depth and HOA review upfront. The composite deck looks better than the sample boards."
"Old deck was rotting at the ledger board. They caught it, re-flashed everything to code, and the new build passed inspection on the first try. Would hire again without a second thought."
Pairs Well With
Complete Your Outdoor Living Space
Frequently Asked Questions
Decks & Porches — Common Questions
How much does it cost to build a deck in Northern Virginia?
A standard pressure-treated or entry composite deck runs $45–$65 per square foot. A premium composite build with upgraded railings, lighting, and framing runs $65–$95 per square foot. A fully screened porch with a roof structure runs $95–$200+ per square foot, depending on electrical, ceiling fans, and finish level.
Do I need a permit to build a deck in Fairfax, Loudoun, or Prince William County?
Yes. Any deck attached to the house, over roughly 200–256 square feet, or more than 16–18 inches above grade requires a county building permit and inspection in Fairfax, Loudoun, and Prince William County. We pull and manage every permit as part of the build.
How deep do deck footings need to be in Northern Virginia?
Footings must bear on solid ground at least 24 inches below grade per Fairfax County's typical deck details, and deeper still if solid bearing soil isn't found at that depth. If a footing sits within 5 feet of the house, it must match the home's existing footing elevation — an inspector verifies this before concrete is poured.
Composite or natural wood — which is better for a NoVA deck?
Composite (Trex, TimberTech, Fiberon) wins for low maintenance and longevity in Northern Virginia's humidity and freeze-thaw cycles, typically backed by 25–50 year manufacturer warranties. Premium hardwoods like IPE, cedar, or mahogany still beat composite for natural beauty if you're willing to oil the surface annually.
How long does it take to build a deck or screened porch?
Most single-feature composite decks take 1–2 weeks of on-site construction once permits clear; screened porches add another 1–2 weeks for roof framing and screening. Plan on 4–8 weeks of lead time for design, HOA review, and permit approval ahead of your target build season.
Can I build on top of my existing deck footings?
Sometimes — it depends on the depth, size, and age of the existing footings relative to current code. We inspect the existing structure before we quote, so you'll know whether footings can be reused or need to be replaced.
Does my HOA need to approve my deck or porch separately from the county?
In most Loudoun, Fairfax, and Prince William County communities, yes — HOAs such as those in Brambleton, South Riding, and Broadlands require architectural review before construction, independent of the county permit. We submit both applications in parallel so one doesn't delay the other.
Free Interactive Tool
Deck Cost Calculator
Pick your size and build tier for an instant installed-cost range.
Ready to Build a Deck or Porch That Lasts?
Get a written, line-item quote in 24–48 hours — permits, footings, and finish all handled by our own crew.