You love your home. You love your neighborhood. You just need more of it. A well-planned addition gives you the space you need — a primary suite, a kitchen that fits your family, a second story — without the cost and upheaval of moving.

Wes-Tec Builders has been building additions across the Denver metro since 1986. We're a family company, BBB A+ accredited with zero complaints filed — a record we believe no other Colorado home improvement company can match.

Primary suite additions

A primary suite addition is one of the most common projects we build: a larger bedroom, a walk-in closet, and a full bathroom, usually added to the ground floor or over an existing garage. Done right, it fixes the single biggest complaint in older Denver homes — one small bathroom serving the whole house — and it adds the above-grade square footage appraisers value most.

Kitchen expansions

Kitchens are where Denver families actually live, and many older homes were built with kitchens sized for a different era. A kitchen expansion — pushing out a wall, opening the kitchen into the living space, or adding a full dining area — changes how the whole house feels. Because kitchen work involves plumbing, electrical, gas, and finishes, it's also the addition type where design matters most: the layout has to work before a single wall comes down.

Multi-story additions

When your lot won't allow building out, building up is the answer. A multi-story addition adds living space on two levels at once — a family room below, bedrooms above, for example — and it's often the smartest way to add serious square footage on a smaller Denver lot. Multi-story work involves more structural engineering than a single-room addition, which is why it starts with a careful look at your foundation and framing.

Want to go all the way up? See our page on pop-top second story additions — adding a full second story to a one-story home.

What an addition costs — and why

Additions are the most expensive square footage you'll ever build, because you're pouring a new foundation, tying into the existing structure, and extending every system your house runs on. As an approximate Denver-market range (not a Wes-Tec quote), full-service addition work typically runs $250–$500+ per square foot, with most projects landing in the $350–$450 per square foot range:

What moves your number: whether you build out or up, whether the addition includes a kitchen or bathroom (plumbing changes everything), the age of your home (older Denver homes often need panel upgrades and code tie-ins), and design and engineering, which typically runs 4–8% of the project cost. Smaller additions also cost more per square foot, because many expenses are fixed no matter the size.

Every project is different, which is why final pricing comes from a free in-home estimate — we look at your actual home and lot, not a stock photo of one.

Our process

1. Free estimate and walkthrough — we look at your home, your lot, and your zoning, and tell you what's actually possible before you spend a dollar on design.
2. Floor plan and 3D model — you see your addition before we build it, and make changes while changes are still cheap.
3. Fixed bid — permits, inspections, engineering, and HOA approvals handled by us.

A typical ground-floor addition runs 3–6 months of construction, with 1–3 months of design and permitting before that. Multi-story and complex additions run longer, and permit review time varies with the season and the project.

FAQs

Do I need a permit for a home addition?

Yes — additions always need building permits, plus zoning review for setbacks, lot coverage, and height limits. We pull all permits and schedule inspections as part of every project.

Is it cheaper to build out or up?

Building out is usually cheaper when your lot and zoning allow it. Building up preserves yard space but adds structural reinforcement, roof work, and stairwell costs.

Will an addition increase my property taxes?

Added square footage gets assessed, so expect a modest increase. Most homeowners find the usable space and resale value far outweigh it.

Ready to add the room your home is missing? Call Wes-Tec Builders at 303-improve or visit westec-builders.com for a free in-home estimate. Forty years family-run, BBB A+ with zero complaints filed — a record we believe no other Colorado home improvement company can match.

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