Building a Deck in One Loudoun
One Loudoun is the mixed-use Metro-corridor development at the heart of Ashburn — a walkable urban planning concept that blends townhomes, detached single-family homes, condos, retail, restaurants, and the One Loudoun Plaza commercial core. Deck projects here split into three distinct categories: compact rear decks on the townhomes, full-size rear decks on the detached estate-section homes, and rooftop terrace builds on the Metro-corridor townhomes designed with rooftop access.
Whichever category your home falls into, the approval path goes through the One Loudoun community ARC + the Loudoun County building permit. We file both in parallel from contract day. See our broader Ashburn deck builder page for context, and rooftop deck builder page if your project is elevated.
How One Loudoun Architectural Review Works
One Loudoun is managed by FirstService Residential, one of the largest residential community management firms in Northern Virginia. The ARC review follows FirstService's standardized process:
- Application form (FirstService submission template)
- Material samples (physical or photo-verified for accepted manufacturer codes)
- Color specifications with manufacturer codes
- Structural drawings showing footings, framing, ledger, railings
- Site plan with setbacks verified against the lot's certified plat
- Homeowner authorization signed for the contractor to file
Townhome sub-sections (compact rear decks): typical review 18-21 days. Detached estate sub-sections: 21-28 days due to wider design vocabulary.
One Loudoun's Modern Design Aesthetic
One Loudoun leans contemporary. The Metro-corridor architecture sets the design vocabulary, and approved deck specifications consistently skew modern:
- Composite tones: Trex Transcend Lava Rock, Dark Hickory, Vintage Lantern; TimberTech AZEK Vintage Mahogany or Coastline (the cool counterpoint)
- Railings: black aluminum cable, black aluminum horizontal, or glass railings (preserves Metro-corridor views from upper-level decks)
- Lighting: integrated low-voltage LED is nearly universal — recessed step lights, post-cap lights, and under-rail strip lighting
- Picture-frame borders: contrasting darker borders around lighter field boards (or vice versa) are popular and approved
- Traditional balustrade railings: also approved but less common in One Loudoun than the modern systems
Two Approvals You Need
A One Loudoun deck project requires two separate approvals in parallel. The FirstService ARC review controls appearance. The Loudoun County building permit controls structure and safety. We file both packages from the day you sign — never serially. Full county process: Loudoun County deck permit guide.
Typical One Loudoun Deck Projects + Pricing
- Townhome rear deck (180-280 sqft): $22,000-$38,000
- Detached single-family rear deck (400-600 sqft): $38,000-$65,000
- Rooftop terrace (Metro-corridor townhomes): $28,000-$58,000 — see rooftop deck builder
- Multi-level estate-section deck (600-800 sqft): $58,000-$95,000
- Full outdoor-living package (deck + screened porch + outdoor kitchen): $85,000-$140,000+
How Loudoun Decks Handles One Loudoun Approvals
We carry the current FirstService Residential submission template, prepare the full ARC packet with material samples and renderings, file the Loudoun County permit in parallel, and coordinate every inspection. We've completed multiple One Loudoun projects across both the townhome and estate sub-sections. See more on our Ashburn deck builder page.
FAQ — One Loudoun HOA deck approval
Do I need HOA approval for a deck in One Loudoun?
Yes. Every deck, balcony rebuild, rooftop terrace, pergola, and exterior structure in One Loudoun requires approval through the community's architectural review process before construction begins. One Loudoun is mixed-use (townhomes + detached homes + condos near the Metro corridor) and the design review intensity varies by sub-section — but the requirement is universal.
How long does One Loudoun ARC review take?
One Loudoun's review typically clears in 18-28 days when the submission packet is complete on first submission. The townhome sub-sections often run on the faster end (18-21 days) given more standardized rules. The detached estate sub-sections take longer (21-28 days) because they support a wider design vocabulary.
Who manages the One Loudoun ARC?
One Loudoun is managed by FirstService Residential, one of the largest residential community management firms in Northern Virginia. Our submissions go through their established process — material samples, color specs, structural drawings, and homeowner authorization. We carry the current FirstService submission template and our packets clear first-round review.
What's the One Loudoun design aesthetic?
One Loudoun leans contemporary — Metro-corridor mixed-use architecture, walkable urban planning, modern home styles. Approved deck materials skew toward darker composite tones (Trex Transcend Lava Rock, Dark Hickory, Vintage Lantern; TimberTech AZEK Vintage Mahogany or Coastline). Black aluminum or cable railings are common. Integrated low-voltage lighting is nearly universal. Traditional balustrade railings are also approved but less popular than the modern systems.
Do townhome rear decks need full ARC review?
Yes — even compact 180-280 sqft townhome rear decks need the same architectural review process as larger detached-home decks. The good news: townhome submissions tend to clear faster because the rules are more standardized and the design vocabulary is narrower. We've completed many One Loudoun townhome rear-deck builds and the typical timeline is 18-21 days from submission to approval.
What does a One Loudoun deck cost?
Townhome rear decks (180-280 sqft): $22,000-$38,000. Detached single-family decks (400-600 sqft): $38,000-$65,000. Rooftop terrace builds on Metro-corridor townhomes: $28,000-$58,000 (see our dedicated rooftop deck builder page for the structural + approval details). Premium estate-tier projects with outdoor kitchens and multi-level designs: $65,000-$120,000+.
Can Loudoun Decks handle the One Loudoun ARC paperwork?
Yes. We maintain the current FirstService Residential submission template for One Loudoun, prepare the full ARC packet with material samples + color specs + structural drawings, file the Loudoun County building permit in parallel, and coordinate every inspection. Homeowners never deal with the portal or the committee directly. Call 571-655-7207.