Material
Pressure-treated wood is the lowest upfront cost. Composite and PVC cost more on day one and usually less over ten years once you count maintenance. It is the single biggest lever on price.
Free tool
What will your project cost?
Answer a few quick questions and get a planning estimate range for your deck, screen porch or sunroom in Northern Virginia. Calibrated to real local pricing. No email wall until the end.
Prefer to talk it through? Call (571) 619-9201 for a free estimate.
How it works
What goes into the number.
A cost calculator can only get you in the ballpark. Here is what actually moves the price, so the range you see makes sense.
Elevation & stairs
A deck eight feet off the ground is a very different project than one at grade. Height drives footings, framing, railing and stairs all at once, which is why two same-size decks can differ by thousands.
Railing & finishes
Standard aluminum or wood railing is included. Cable, glass and composite railing add linear-foot cost. Lighting, under-deck drainage and screen or glass systems each add to the total.
New vs. replacement
Replacing an existing structure adds tear-out and haul-away. If the footings and framing are sound, resurfacing costs less than a full rebuild — we tell you which applies after we look.
Why we show a range, not one number
Any contractor who gives you an exact price before seeing your site is guessing. Our range is calibrated to real Northern Virginia pricing and to OSSA's own completed projects, so it is honest at the planning stage. The exact number comes after a free on-site visit, in writing, within 48 hours — with materials and labor together and no hidden costs. Permits are handled by us; permit fees vary by county and project type. Every estimate also includes a free photorealistic 3D design so you see the finished project before we build it.
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Questions
About the calculator.
Straight answers about how the estimate works and what happens next.
Explore Deck BuildingHow accurate is this calculator?
It gives a planning estimate range calibrated to real Northern Virginia pricing and OSSA's completed projects. It is not a final quote. The exact number depends on site conditions, elevation, and finishes, which we confirm during a free on-site visit and put in writing within 48 hours.
What does the estimate include?
Materials and labor together, with no hidden costs. Permits are handled by us; permit fees vary by county and project type and are quoted separately once we scope the project.
Why is it a range instead of one price?
Two decks of the same size can cost very differently depending on elevation, railing, stairs and finishes. A range is honest at the planning stage; the exact number comes after we see the site.
Do I have to pay for an estimate?
No. The on-site estimate and the 3D design are both free, with no obligation.
What happens after I get my estimate?
We reach out to schedule a free on-site visit, design your project in 3D, and send a fixed-price written proposal within 48 hours. You are never obligated to move forward.
Ready for the real number?
Turn your estimate into a plan.
We will walk your space, design it in 3D, and put a fixed price in writing within 48 hours. Free, no obligation.
Get My Free Estimate