Deck & Patio Construction in Bethesda and Rockville
Outdoor Rooms, Built Like the Indoor Ones
A deck or patio is a room without a roof, and we design it the way we design interiors: how you'll cook, sit, and move through it, then the structure to make it last. Our crews build composite and wood decks, paver and flagstone patios, screened porches, fences, and outdoor kitchens across the DMV — and because we also build home additions and sunrooms, we can tell you honestly when a screened porch will serve you better than an open deck, or vice versa.
Building outdoors here means building for the climate and the county. Montgomery County requires permits and inspections for decks, and we handle the drawings, setbacks, and footing inspections as a matter of course. The region's humid summers have pushed most of our clients to low-maintenance composite decking, while the clay-heavy soils under Bethesda, Potomac, and Rockville yards mean a paver patio is only as good as its compacted base — the shortcut jobs are the ones you see heaving every spring. Flagstone remains the signature look for Chevy Chase and Potomac properties, and screened porches earn their keep from May through September, when mosquitos otherwise own a DMV backyard. In HOA communities like Kentlands and King Farm, we prepare the architectural review submissions too.
Planning an outdoor project alongside interior work? Many clients pair a new deck with a kitchen or basement project so the construction happens in one season. Stop by the iDesign showroom in North Bethesda to look at decking, railing, and stone samples. Plan a visit to the showroom seven days a week.
Our Outdoor Construction Services Include:
- Composite and pressure-treated wood deck construction
- Paver, flagstone, and concrete patio construction
- Screened porch construction and deck-to-porch conversions
- Outdoor kitchens, built-in grills, and fire pit areas
- Fence building: wood, vinyl, and aluminum
- Deck repair, re-decking, and exterior structural repairs
Our Outdoor Build Process
- 1
Design & Materials
Layout, decking or stone selection, and a fixed-scope proposal.
- 2
Permits & HOA
County permit drawings and HOA review handled for you.
- 3
Foundation First
Inspected footings for decks; excavated, compacted base for patios.
- 4
Build & Final Inspection
Framing, surfaces, and railings built to code and signed off.
Ready for a Better Backyard?
Get a design and quote now and your deck can be ready for the next warm season.
Get a Free QuoteOne Licensed Contractor for Inside and Out
Decks and patios attach to your house, cut into its drainage, and carry real structural loads — so they deserve the same licensed, inspected construction as an addition. iDesign has built across Montgomery County and the wider DMV for 25+ years and 2,700+ projects, and our outdoor work follows the same rule as our interiors: fix the structure and the water management first, because that is what decides whether the project still looks right in year ten. Finishing touches like exterior staining and trim come from the same team behind our painting and carpentry services.
25+
Years Serving the DMV
2,700+
Completed Projects
Permits
& Inspections Handled
Frequently Asked Questions About Decks & Patios
Do I need a permit to build a deck in Montgomery County?
Yes. Montgomery County requires a building permit for decks, with plans showing footings, framing, and guardrails, and the structure must meet setback rules for your zone. We prepare the drawings, pull the permit through the county Department of Permitting Services, and schedule the required inspections. Ground-level patios generally do not need a building permit, though stormwater and lot-coverage rules can still apply.
Wood or composite decking — which is better here?
In the DMV's humid summers and freeze-thaw winters, pressure-treated wood needs staining every 2-3 years and still tends to check and splinter, which is why most of our clients now choose composite (Trex and similar). Composite costs roughly 40-60% more upfront but needs only washing, and 25-year fade-and-stain warranties are standard. We build both and will price both for you.
Why do paver patios sink, and how do you prevent it?
Most failed patios in this region sit on poorly compacted base over our clay-heavy soils, which swell when wet and shrink when dry. We excavate to stable subgrade, compact graded aggregate base in lifts, and slope the surface away from the house, so the patio sheds water instead of pumping it toward your foundation, and stays flat through freeze-thaw cycles.
Do you need HOA approval before building?
In many area communities, yes — neighborhoods like Kentlands, King Farm, and most newer subdivisions require architectural review board approval for decks, fences, and patios before county permitting. We prepare the drawings and material specs the review board asks for, and we have been through the process with HOAs across Montgomery County.
How Much Does a Deck or Patio Cost in the Bethesda Area in 2026?
| Project Scope | Estimated 2026 Cost* |
|---|---|
| Pressure-treated wood deck (250-350 sq ft)Permitted, inspected framing with wood decking and railings. | $10,000 – $20,000 |
| Composite deck (250-350 sq ft)Trex-class decking and railings; minimal maintenance. | $18,000 – $35,000 |
| Paver or flagstone patioExcavation, compacted base, and stone or paver surface. | $5,000 – $18,000 |
| Screened porchRoofed, screened outdoor room on permitted footings. | $30,000 – $70,000 |
| Fence installationWood, vinyl, or aluminum, per HOA and county rules. | $3,500 – $12,000 |
*These figures are rough planning estimates only. Your actual quote will depend on in-home measurements and the current cost of materials and labor at the time of your project, as well as the specific finishes and scope you choose. For an accurate price, schedule a free in-home consultation with our team.
Deck & Patio Construction in the DMV Area
We design and build decks, patios, porches, and fences throughout Maryland, DC, and Northern Virginia, including:
Bethesda, MD
North Bethesda, MD
Rockville, MD
Potomac, MD
Chevy Chase, MD
Gaithersburg, MD
Silver Spring, MD
McLean, VA
Explore Related Services
What Our Clients Say
Five-star reviews from homeowners across the DMV area.
Kitchen Remodel & Custom Addition
This was our fourth project with iDesign in the past couple of years, and they impress us every time — the office responds quickly and the crews show up when promised. For our full kitchen renovation and custom addition, the showroom team explained every phase and worked in everything on our list. They even matched the paint and style of the addition to the rest of the house, something other contractors had told us was impossible.
Roger
Multi-Room Home Remodel
iDesign made our dream home happen. Coordinating separate contractors for a multi-room remodel had been a struggle, but working with one design team and their own crews took all of that stress away. Communication was excellent from start to finish across nearly 2,400 square feet of renovation — including the kitchen, which had felt overwhelming before. We are grateful to the whole team.
Man J.
Full Condo Remodel
Our condo received a stunning top-to-bottom remodel: a flawless kitchen transformation, a bathtub-to-shower conversion, popcorn ceiling encapsulation, and new recessed lighting that brightens the whole space. The craftsmanship is exceptional, and the customer service made a major renovation completely stress-free.
Elena D.
Second-Story Addition & Rental Prep
We were on a hectic timeline preparing our house as a rental before moving out of the DMV, and we could not have navigated it without iDesign. They built a custom second-story addition, replaced the kitchen backsplash, installed a new bathroom vanity, and repainted several rooms — and they connected us with a licensed architect for the DC permits, which saved us a huge headache. Their attentiveness and input were invaluable.
Rami B.
Emergency Repair & Bathroom Remodel
When water started leaking through our ceiling one morning, the iDesign team and their plumber were at our house within hours and quickly traced it to a pipe under the bathroom floor. The price they offered was so good that we ended up redoing the entire bathroom. The work was wonderful, finished quickly, and barely disrupted our routine — we would call them again without hesitation.
Claudia F.
Visit Our Showroom
Compare composite decking, railing, and stone samples in person at our North Bethesda showroom.
iDesign Interior Solutions · North Bethesda, MD
(301) 881-1115 · Mon–Fri 9am–6pm · Sat 9am–6pm · Sun 10am–3pm