Deck Builders Near Me in Boulder, CO? Build Your Own Deck With an A-DIY Kit

Both routes work. Boulder deck contractors handle custom, attached and elevated decks along with the permit paperwork; ask for written quotes, proof of insurance and recent Boulder County work. For a freestanding ground-level deck, A-DIY delivers professionally engineered wood and composite deck kits that you or a local handyman can assemble with just a drill.

Contractor pricing reflects size, materials, height, footings, permits and Boulder-area labor costs. A-DIY kits range from $3,699 for a 6x12 pressure-treated deck to $12,799 for a 16x28 composite deck. Building it yourself removes most of the labor cost, and homeowners typically spend 30–50% less than hiring a contractor. Permits, site prep and hired help aren’t included in kit prices.

With A-DIY, a 12x12 deck kit is $4,899 in pressure-treated wood or $5,700 in composite. A 12x16 composite kit is $6,600; the closest wood size is 12x18 at $5,969. A 16x20 kit is $7,600 in wood or $10,199 in composite. Framing, decking, footings and hardware are included.

Inside city limits, City of Boulder Planning & Development Services reviews deck permits. The City adopted the 2024 International Code Council codes with local amendments, effective Aug. 1, 2025, and its residential deck checklist covers both attached and freestanding decks. Homes in unincorporated areas go through Boulder County Community Planning & Permitting instead.

Under the model residential code, freestanding decks no larger than 200 sq ft, no more than 30 inches above grade and not serving the required exit door are typically exempt, but Boulder adopts its own amendments and adds wildfire rules in its WUI area. Contact Planning & Development Services to confirm whether your deck is exempt before you build. In unincorporated Boulder County, check with Community Planning & Permitting.

Many customers use their A-DIY decks for hot tubs and saunas. Applicable configurations are engineered to hold up to 15,000 lbs when properly assembled and supported, but tub weight, placement and wiring vary, so talk to a deck specialist before you order and check local electrical and permit rules.

Footings for attached decks must reach below the frost line. The City’s published design criteria have listed a 32-inch frost depth, and Boulder County calls for footings at least 30 inches deep. Expansive clay soils are common around Boulder, so ask the building department what it expects for your site. Whether freestanding footings like the Tuff Blocks included with A-DIY kits are accepted on a permitted deck is up to the building official.

They can. Building permits issued on or after Aug. 1, 2025 for properties in the City’s wildland-urban interface (WUI) area must meet ignition-resistant construction requirements based on the 2024 International Wildland-Urban Interface Code with local amendments, and a permitted deck replacement must meet the deck-specific rules. Boulder County has its own wildfire building amendments that address decking. Check your address and the requirements before choosing materials.

Boulder averages close to 90 inches of snow a year, much of it in heavy spring storms, along with strong high-altitude sun, dry air, powerful downslope winds and summer hail. Seal pressure-treated wood every one to two years or choose composite, clear snow with a plastic shovel and check the deck for level each spring.

Pressure-treated wood kits come in 15 sizes: Standard 12x12, 12x18, 12x20, 12x24, 12x28, 16x16, 16x20, 16x24 and 16x28, plus Compact 6x12, 6x16, 6x20, 8x12, 8x16 and 8x20. Composite kits come in 9 sizes from 12x12 to 16x28 in Amazon Gray or Forest Wood. Custom sizes are available on request.

Most homeowners build between May and October, once the snowy spring months have passed. Ordering over the winter gets your kit to you as soon as the ground dries, and morning build sessions help you avoid afternoon thunderstorms in summer.

Yes. A-DIY ships by LTL freight to Boulder and nearby communities including Louisville, Lafayette, Superior, Longmont, Gunbarrel and Niwot, with curbside delivery typically in 10–14 business days. Pay in full, use 0% split payments for up to 8 months, or build now and pay later with Affirm, Klarna or Shop Pay, subject to approval. A-DIY Reserve holds today’s price with a $250 non-refundable deposit.