Deck Builders in Thornton, CO

Deck Builders in Thornton tend to hear the same request: a deck the whole family can actually use. Census estimates count 2.84 people in the average Thornton household and put a full quarter of residents under 18. That shapes how we design here. We think about where the kids will run, where the grill goes so it is not in a traffic lane, and how the stairs land so nobody has to cut across a flower bed to reach the yard.

Two very different housing eras

Thornton started in 1953, when Sam Hoffman bought land off Washington Street about seven miles north of Denver and laid out what Wikipedia describes as the first fully planned community in Adams County. By the end of 1955 the new town held about 5,500 people in more than 1,200 homes. Since then the city has kept growing, and E-470 now runs through its northern end: the 2020 census counted 141,867 residents, up 19.4% from 2010. A deck behind an original Hoffman-era ranch and a deck behind a house finished a few years ago are not the same project. The older house may need a freestanding frame or a new ledger detail; the newer one often has a builder-grade patio door, a walkout and a grading plan we have to respect.

What families ask us to build

• Composite decks for low-maintenance surfaces that stay splinter-free under bare feet
• Wood decks in pressure-treated or cedar when you want a natural look and plan to refinish
• Railings and stairs with tight baluster spacing, graspable handrails and a lit top landing
• Covered decks and pergolas that put shade over the table during summer afternoons
• Repairs and replacements for tired decks that came with a resale home
• Staining and sealing on a schedule that matches Front Range sun

Railings and stairs come first in a kid-heavy yard

The American Wood Council's DCA 6 deck guide, which follows the International Residential Code, calls for a guard on any deck more than 30 inches above grade, a handrail on stairs with four or more risers set between 34 and 38 inches high, and a light at the top landing that lights every step. We treat those as the floor, not the goal. For a young family we often suggest wider stairs with a landing, a gate at the top, and railing infill with no horizontal rails that turn into a ladder.

Building around hail season

Colorado State University climate data, as reported by FOX31, shows hail starting to pick up in late April and early May, with severe hail days peaking in early to mid-June and tapering by mid-August. If you want the deck ready for summer, the best time to plan is winter, so permits and materials are lined up before storm season. Composite and capped boards shrug off small hail better than soft woods, and we can talk through how different railing tops and post caps hold up.

Thornton soils and footings

The Colorado Geological Survey calls expansive soil the state's most significant geologic hazard and notes that most of Colorado's homes are in areas with potentially expansive clay. Lightly loaded structures, which describes a deck, are exactly what this soil pushes around. We size and depth footings to the local design criteria and the inspector's direction, and we keep downspouts and sprinkler heads from soaking the ground around posts.

Permits and HOA paperwork

Raised and attached decks commonly need a building permit, and we confirm the city's requirements for your plan before work starts. If your subdivision has an HOA, it may run its own design review as well. We draw a plan with dimensions, materials and colors that you can submit to both. Call (720) 604-3036 or

Get a Free Estimate

and we will walk the yard with you and put a written quote in your hands.