Home Additions in Denver, Colorado

Home additions in the Denver metro

When you love your neighborhood but need more space, an addition beats moving. BH Builders designs and builds additions throughout the Denver metro, extra bedrooms, expanded kitchens, primary suites, sunrooms, in-law suites and full second stories. The craft of an addition is making new construction look like it was always part of the house: matching rooflines, siding, window styles and floor heights so the seam disappears.

As a licensed, insured general contractor in Greenwood Village, we manage design, structural engineering coordination, permitting, foundation, framing, roofing, and every finish trade, with one point of contact and a fixed written scope.

Types of additions we build

• Room additions: a new bedroom, family room or expanded kitchen on the main level.
• Primary suite additions: bedroom plus bath and closet, often over or beside the garage.
• Bump-outs: a few feet of extra depth to enlarge a kitchen, bath or dining area.
• Second-story additions: a full floor added above an existing single-story home.
• In-law & guest suites: independent living space with its own bath and entry.
• Sunrooms & four-season rooms: light-filled space built for Colorado weather.

Second-story additions in Denver

A second-story addition is the biggest thing you can do to a house without moving off the lot, and in the Denver metro it is often the only way to double the living space of a ranch on a lot you love. It is also the addition that separates real builders from box-bolters, because the house has to keep standing while a new floor lands on it.

• The structure below decides everything. A new floor adds load to walls, headers and foundation that were sized for a roof. A structural engineer evaluates the existing framing and footings, and the drawings show exactly what gets reinforced, sometimes a few posts and beams, sometimes new footings. We open up and verify before the price is final, so the reinforcement is in the number, not a change order.
• Zoning sets the height. Denver’s bulk-plane and height limits, and the equivalent rules in Greenwood Village, Cherry Hills Village and the suburbs, decide whether a full second story fits or whether the design needs a partial story, dormers or a lower plate height. We confirm the envelope for your exact lot before design starts.
• The roof comes off once. The tear-off, new floor system and new roof are sequenced to happen in the shortest weather window we can plan, with the house tarped and protected in between. Colorado’s afternoon storms are part of the schedule, not a surprise.
• Living through it. Most families stay in the house for a second-story addition, but the noisiest weeks, demolition and framing, are loud, and there is usually a stretch without upstairs plumbing or HVAC while systems are rerouted. We tell you which weeks those are before you sign.
• What it typically costs. Full second stories in the Denver metro generally run $200k to $500k+ depending on size, how much reinforcement the existing structure needs and the finish level (see the cost section below). Partial second stories and additions over a garage land lower.

Second-story projects are especially common in Greenwood Village and Lone Tree, where original single-story homes sit on lots that easily justify the investment. If your home is a candidate, the phase-by-phase calculator above prices the second-story type with the engineering and reinforcement phases included.

Adding on vs. moving

When you are out of space, the real choice is add on or move. Both cost money; they buy very different things. An addition keeps you in the neighborhood, schools and yard you already love, avoids the transaction costs of selling and buying (agent commissions, closing costs, moving), and lets you build exactly the space you want. Moving gets you more all at once but rarely gets you a home that fits perfectly. For many Denver-metro families, especially where the lot and location are excellent but the floor plan is dated or cramped, a well-designed addition is the better long-term investment. We are happy to talk through the honest trade-offs for your situation during the free consultation.

Our step-by-step home addition process

1. Free consultation: we assess feasibility, your goals and your lot.
2. Design & engineering. Plans are drawn and a structural engineer sizes the new loads.
3. Written estimate with a line-item scope and price.
4. Permits & zoning. We confirm setbacks and height limits and pull the permit.
5. Foundation. Footings and foundation are poured to match the structure.
6. Framing & roof. The shell goes up and is tied into the existing roofline.
7. Dry-in. Windows, roofing and siding make it weather-tight.
8. Rough-in of plumbing, electrical and HVAC, inspected.
9. Insulation, drywall & finishes matched to the rest of the home.
10. Final walkthrough and punch list.

Home addition cost in Denver: what drives the price

Additions in the Denver metro start at about $100,000 for a straightforward single-room addition and run to $500,000+ for a full second story. Within that spread, the price is driven by square footage, structural complexity (second stories most of all), foundation work, how the new roof ties into the old, and finish level. Planning ranges:

Per square foot, additions in the metro generally land around $300 to $600+ all-in depending on type and tier, higher than remodeling an existing room because you are building foundation, structure, roof and envelope, not just finishes. The four things that move your number most: the foundation (a crawlspace bump-out versus a full basement under the addition), plumbing (a bath or kitchen in the new space), the roof tie-in (a simple shed roof versus matching a complex existing roofline), and finish tier. Our Denver home renovation cost guide names exactly what each tier buys, and the calculator above prices your addition phase by phase.

What to expect during construction

An addition is a bigger disruption than an interior remodel because it starts outside and works in. Here is the honest picture so there are no surprises:

1. Site & foundation phase. Excavation and concrete are noisy and weather-dependent; your yard becomes a work zone for a few weeks.
2. Framing & dry-in. The shell goes up fast and is exciting to watch; once it is weather-tight, work moves inside.
3. Connecting old to new. The point where we open the existing wall into the addition is the most disruptive interior day, we contain it tightly and schedule it deliberately.
4. Finishes. The quiet, detailed phase where the addition starts to feel like part of your home.

Throughout, you keep living in the house. We stage the work so your daily routine is protected as much as possible, and your single point of contact keeps you ahead of what is happening next.

Want your project priced this way? The calculator above builds your estimate phase by phase with these exact sequences. For how the design and permit weeks before construction add up across every project type, read how long a Denver remodel takes.

The craft of a seamless addition

Anyone can bolt a box onto a house. Making an addition look like it was always there is where craftsmanship earns its keep, and it is what we obsess over:

• Roofline & pitch. We match the existing roof pitch and tie the new ridge and valleys in cleanly so the profile reads as one continuous roof, not two.
• Siding & masonry. We match profile, exposure and color, and when siding has weathered, we blend the transition so the new material doesn’t stand out as obviously fresh.
• Windows & trim. New windows match the style, proportion and trim detail of the originals.
• Floor heights. We plan the new floor system so finished floors meet flush with the existing home, no awkward step between old and new.
• Interior transitions. Ceiling heights, trim profiles and flooring carry through so the inside flows as naturally as the outside.

When it is done right, the highest compliment is that no one can tell where your original home ends and the addition begins. That is the standard we build to.

Denver permits, zoning & codes for additions

Additions are the most heavily regulated residential projects because they change the building footprint and structure. We handle it all, under our own license:

• Denver: zoning review comes with the permit. In the City and County of Denver an addition permit goes through Community Planning and Development, and zoning is checked as part of that review: setbacks, lot coverage, height and the bulk plane that limits how tall a second story can be near the side property lines. We confirm the envelope for your exact zone district before design is final. The Denver card in our permit guide covers fees, timing and the quirks of that desk.
• Licensed to pull it. Denver issues the permit to the license that files it. BH Builders holds Residential Contractor Class C license LIC00255323 in Denver (and Class C 2026-2651997 in Aurora), so your addition permit is filed under our own name.
• Outside Denver. Every suburb runs its own desk, in our home city, Greenwood Village Building Permits & Inspections; elsewhere, the office linked on your city page. Setback, height and coverage rules differ from Denver’s, and HOA design review is common in the southern suburbs.
• Structural permits. New foundations and framing require engineered, stamped plans and staged inspections, footing, framing, rough trades, insulation, final.
• Egress. New bedrooms need code-compliant escape openings per IRC R310.
• Licensed trades. Verify via Colorado DORA.

Why choose BH Builders for your addition

• Seamless integration: rooflines, siding and floor heights matched to the existing home.
• Full project management from design and engineering through finishes.
• Licensed & insured, permitted and inspected.
• Local to Greenwood Village and the Denver metro.