Deck Contractor in Bethesda and Rockville, MD
Decks Built Like the Rest of Your House
A deck is a structure bolted to your home, carrying people, furniture, and snow loads several feet off the ground — so we build it with the same licensed, inspected framing as a home addition. Our crews design and build composite and pressure-treated wood decks, multi-level decks, re-decking projects, and screened porches across the DMV. Because we also build sunrooms, we can tell you honestly when a screened porch will serve you better than an open deck.
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 in Bethesda, Potomac, and Rockville to low-maintenance composite decking, and screened porches earn their keep from May through September, when mosquitoes otherwise own a DMV backyard. In HOA communities like Kentlands and King Farm, we prepare the architectural review submissions too.
Want a ground-level outdoor space instead, or a patio beneath the deck stairs? See our patio contractor services for paver and flagstone patios. Compare decking and railing samples at the iDesign showroom in North Bethesda, open seven days a week.
Our Deck Services Include:
- Composite (Trex-class) deck construction
- Pressure-treated wood and multi-level decks
- Re-decking and railing replacement on sound frames
- Deck repair, ledger flashing, and structural fixes
- Screened porch construction and deck-to-porch conversions
- Deck stairs, lighting, and built-in benches
Our Deck Building Process
- 1
Design & Materials
Layout, decking and railing selection, and a fixed-scope proposal.
- 2
Permits & HOA
County permit drawings and HOA review handled for you.
- 3
Footings & Framing
Inspected footings, flashed ledger, and code-compliant framing.
- 4
Decking & Final Inspection
Surfaces, railings, and stairs built to code and signed off.
Ready for a New Deck?
Get a design and quote now and your deck can be ready for the next warm season.
Get a Free Deck QuoteA Licensed Contractor, Not Just a Deck Crew
iDesign has built across Montgomery County and the wider DMV for 25+ years and 2,700+ projects. Our deck work follows the same rule as our interiors: get the structure and water management right first — footings below frost depth, a properly flashed ledger — because that decides whether the deck is still solid in year twenty. 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
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 footing, framing, and final inspections.
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.
Can you re-deck over my existing deck frame?
Sometimes. If the joists, beams, ledger connection, and footings are sound and meet current code, replacing only the decking and railings is the most economical upgrade. If the ledger is not properly flashed and bolted, or the framing shows rot, we recommend rebuilding the structure — new decking on a failing frame is money spent twice.
Do you need HOA approval before building a deck?
In many area communities, yes — neighborhoods like Kentlands, King Farm, and most newer subdivisions require architectural review board approval for decks 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 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 |
| Screened porchRoofed, screened outdoor room on permitted footings. | $30,000 – $70,000 |
*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 Builder Serving the DMV Area
We design and build decks and screened porches 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
Planning Guides for Covered Outdoor Space
Screened Porch vs. Covered Patio in Maryland
2026 cost ranges, why mosquitoes decide it for most Montgomery County homeowners, the DPS permit line, and what each does for resale.
Screen Porch Enclosure vs. Sunroom in Maryland
Three-season and four-season costs, the structural surprises in a porch conversion, and how conditioned space changes your assessment.
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 and railing 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