Service 03 / Residential construction
Residential Construction in Denver
New homes, additions and whole-house rebuilds designed around expansive soils, radon, snow and hail, and the zoning rules that decide what fits on the lot.
- Sheet
- S-03
- Discipline
- Residential Construction
- Scope
- New homes
- Additions
- Whole-house rebuilds
Decide what kind of project you have
Residential construction in Denver usually means one of three things: a new home on a vacant or cleared lot, an addition to an existing house, or a whole-house rebuild that keeps little more than the address. On a napkin sketch they look alike. In permitting, foundation work, cost exposure and time out of the house, they are very different projects.
An addition ties new construction to an old structure, so the existing foundation, framing, roof and utilities all have to accept new loads and connections. A rebuild trades those unknowns for demolition, new utility services and a full new-construction permit. A new home on an empty lot has the fewest surprises above grade and the most decisions below it.
Addition, rebuild or new home
If the existing house is sound and you need more space, not a different house
Then an addition usually costs less and keeps the parts of the house that already work.
If the foundation, framing and systems all need major work and the floor plan fights you
Then price a whole-house rebuild next to the remodel, because the numbers are often closer than expected.
If you are buying land or a teardown lot
Then get a soils report and a zoning check before closing, since both shape what you can build and what it costs.
If you plan to keep most of the existing house, our remodeling and renovation page covers older Denver homes in more depth. For architect-led, one-of-one houses, see custom home construction.
Front Range soils decide the foundation
Much of the Denver area sits on clay soils and claystone bedrock that swell when wet and shrink when dry. Expansive soil is why Front Range basement slabs crack, why interior basement walls are often built to float above the slab, and why foundation design starts with a site-specific geotechnical report rather than a standard detail.
The geotechnical engineer drills test borings, tests samples for swell potential and bearing capacity, and recommends a foundation system along with drainage details. The structural engineer designs from those recommendations. We price foundations from the report, not before it, because the cost gap between systems can be large.
| Criterion | How it works | Where engineers tend to recommend it |
|---|---|---|
| Spread footings | Footings bear directly on native soil | Sites with low swell potential |
| Over-excavation and replacement | Expansive soil below the foundation is removed and replaced with moisture-conditioned, compacted fill | Moderate swell where removing a layer of problem soil is practical |
| Drilled piers and grade beams | Concrete piers are drilled to a design depth, often into bedrock, and the house bears on beams spanning between them | High swell potential or variable soil conditions |
| Structural floor over a crawlspace | The lowest floor is a suspended system that never rests on the soil | Lower levels where a slab on expansive soil would heave |
Plan for radon before the slab goes in
Radon is a naturally occurring radioactive gas that comes from uranium in soil and rock. Colorado has widespread high radon potential, and the EPA recommends fixing homes that test at or above 4 picocuries per liter. High readings show up in new and old houses alike, and a neighbor's test result tells you little about yours.
In new construction, the inexpensive move is to build radon-resistant features in from the start: a gas-permeable layer under the slab or a sealed membrane over crawlspace soil, a vent pipe running from below the floor up through the roof, and an electrical outlet in the attic near the pipe. That is a passive system. If a test after move-in comes back high, adding an inline fan makes it active without opening floors. Some jurisdictions require these features and others leave them optional, so we confirm the local rule and plan to test after move-in either way.
Energy code, air sealing and the blower door
Denver and most nearby jurisdictions build to recent editions of the International Energy Conservation Code with local amendments. For a new house that means minimum insulation levels, window performance, mechanical ventilation and measured airtightness. A blower-door test uses a calibrated fan to pressurize or depressurize the house and measure how much air leaks through the envelope. Duct leakage is often tested as well.
The test only measures what framing and rough-in already decided. Sill plates, rim joists, top plates, window rough openings, attic hatches and every penetration for pipes, wires and flues need sealing before insulation and drywall hide them. A tight house also needs planned fresh air, which is why the code pairs airtightness with mechanical ventilation. Running a test before drywall, while leaks are still easy to find, costs little and avoids a failed final.
Roofs built for snow, hail and high-altitude sun
Roof framing is designed for the ground snow load the local jurisdiction sets, which climbs with elevation toward the foothills. Drifting at roof steps, valleys and parapets concentrates load, and an addition that sits below an existing roof can collect snow sliding or drifting off the taller roof above it. That deserves an engineer's look before framing is ordered.
Hail is the more frequent problem. The Front Range sees hail often, and many owners choose roofing rated for impact resistance under UL 2218, where Class 4 is the highest rating. Impact-rated options exist in asphalt shingles, metal and composite products. Freeze-thaw cycles cause ice dams when heat escapes into the attic, so air sealing and insulation at the ceiling plane, roof ventilation and an ice barrier membrane at the eaves all matter. Strong sun at altitude also ages sealants, membranes and exterior finishes faster, which affects material choices on south and west exposures.
Permits, zoning and design review
In Denver, a new home, a rebuild or an addition needs a residential permit from Community Planning and Development, including zoning review. For additions, zoning is often the harder conversation: setbacks, building coverage, height and, in many residential zone districts, a bulk plane that limits how tall walls can be near the side property lines. A second-story addition that looks simple on paper can run straight into those limits.
Demolition for a rebuild has its own permit and review steps. Properties in a Denver historic district or designated as landmarks need design review from Landmark Preservation before exterior changes, which adds time and can shape materials and massing.
HOA and architectural review outside the city
Many suburban subdivisions have homeowners association covenants and an architectural review committee that must approve plans before construction starts. Review can cover height, setbacks beyond zoning, roofing, exterior colors, fencing and landscaping. HOA approval and the building permit are separate, and one does not grant the other. Check which jurisdiction and association apply to your lot; our Front Range service areas page lists the communities we work in.
Sorting out soils, zoning and review requirements before design is final is the core of pre-construction planning, and the step-by-step construction process shows where each approval lands in the schedule.
The bottom line
- Choose between an addition, a rebuild and a new home based on the condition of the existing house.
- The geotechnical report sets the foundation type, and drainage is part of the foundation.
- Radon-resistant features cost least when they go in before the slab.
- Zoning limits such as bulk plane often decide what an addition can be.
New homes face different local rules across the corridor. See new homes and water budgets in Castle Rock, Aurora's landscaping rules for new homes and testing requirements for homes in Fort Collins, or every city we build in.
Residential Construction: common questions
Why do new homes around Denver need a soils report?
Many Front Range sites have expansive clay soils or claystone bedrock that swell when wet and shrink when dry. A geotechnical report tests the soil on your specific lot and gives the structural engineer the information needed to choose a foundation system and drainage details that limit movement.
What is a structural floor?
A structural floor is a lowest-level floor built as a suspended system supported by the foundation, with a crawlspace beneath it, instead of a concrete slab resting directly on the soil. Engineers often specify one where expansive soils could lift a slab.
Should a new home in Colorado include a radon system?
Much of Colorado has high radon potential, and building in passive radon-resistant features during construction costs far less than retrofitting later. Some jurisdictions require these features in new homes. Either way, test the house after move-in; the EPA recommends mitigation at 4 picocuries per liter or higher.
Do I need a permit for a home addition in Denver?
Yes. An addition needs a residential permit from Denver Community Planning and Development, which includes zoning review for setbacks, height, lot coverage and bulk plane where it applies, along with review of the structural, mechanical, electrical and plumbing work.
What is a blower-door test?
A blower-door test uses a calibrated fan mounted in an exterior door to pressurize or depressurize a house and measure how much air leaks through the building envelope. Energy codes commonly require it for new homes to verify airtightness.
Next step
Start witha conversation.
Tell us about the residential construction project you are planning. We will walk through scope, permits and timing with you.
Request a consultation