Structural Engineer–Owned Design-Build Contractor Serving Boulder & the Foothills
PrimeStone Construction Group brings structural engineer–owned, design-build expertise to Boulder, Colorado — a city of high property values, a strong university and tech economy, and one of the most ADU-friendly and sustainability-focused planning codes in the state. From ADUs and premium remodels to custom homes below the Flatirons, we manage design, engineering, permits, and construction throughout Boulder.
Get a Free Consultation → 720-468-0686
Serving Boulder, CO
PrimeStone serves all of Boulder and the surrounding foothills. Here’s our service area:
Why Boulder Homeowners Choose PrimeStone
- Structural engineer–owned: In-house engineering for ADUs, additions, and custom homes on Boulder’s varied and often sloped lots.
- ADU-friendly expertise: Boulder is one of Colorado’s most ADU-friendly cities — we help you take full advantage of its updated rules.
- High-value market fit: Boulder’s premium market rewards quality, energy-efficient, well-engineered construction.
- Sustainability-minded: Boulder values green building and energy performance; we design with efficiency in mind.
- Full design-build: Design, engineering, permits, and construction from one accountable team.
Our Services in Boulder
In Boulder, we focus on the services in highest demand for this market:
Looking for a different service in Boulder — such as a kitchen remodel, a basement finish, or a room addition? We do offer these throughout the Denver metro and surrounding area. Call us to discuss your project; we’re simply highlighting our most-requested Boulder services above.
Building Permits & Regulations in Boulder
Construction in Boulder is administered by City of Boulder Planning & Development Services (303-441-1880), one of Colorado’s most rigorous — and, for ADUs, most progressive — planning departments. Key points:
- Permits required: New construction, additions, structural remodels, basement finishes, decks, and trade work require permits.
- Very ADU-friendly: As of 2025 updates, Boulder allows ADUs on residentially zoned lots with NO owner-occupancy requirement and no parking minimum — reviewed administratively through the standard building permit process.
- ADU size: Detached ADUs are generally capped around 800 sq ft (market-rate), with larger allowances under the affordable-ADU program.
- Plan review timeline: Standard residential plan review in Boulder generally takes about 4–8 weeks; code-compliant ADU applications can move faster.
- Rigorous standards: Boulder emphasizes open space, stormwater, neighborhood character, and energy performance — getting the site plan right the first time avoids delays.
Boulder’s ADU and land-use rules were updated in 2025 and continue to evolve. PrimeStone confirms current requirements with Boulder Planning & Development Services for every project.
Boulder Areas We Serve
We serve homeowners throughout Boulder, including historic neighborhoods like Whittier and Mapleton Hill, the university area, and homes tucked against the Flatirons and foothills. Boulder’s housing shortage and strong rental demand make ADUs a particularly compelling investment, alongside premium remodels and custom homes.
Frequently Asked Questions
Does PrimeStone serve all of Boulder?
Yes. We serve homeowners across Boulder, from historic neighborhoods like Whittier and Mapleton Hill to homes along the foothills and Flatirons.
Is Boulder ADU-friendly?
Very. As of 2025 updates, Boulder allows ADUs on residentially zoned lots with no owner-occupancy requirement and no parking minimum, reviewed administratively through the standard building permit process. Detached ADUs are generally capped around 800 sq ft market-rate.
Do I need owner-occupancy to build an ADU in Boulder?
No. Boulder eliminated its owner-occupancy requirement in 2025, ahead of and consistent with Colorado state law. You can build and rent an ADU without living on the property.
How long does Boulder permit review take?
Standard residential plan review in Boulder generally takes about 4–8 weeks, though it varies with application volume. Code-compliant ADU applications can move faster since they’re reviewed administratively. PrimeStone prepares complete applications to avoid resubmittal delays.
Do I need a permit to remodel in Boulder?
Yes, for most projects. Additions, structural remodels, basement finishes, decks, and trade work require permits from Boulder Planning & Development Services. PrimeStone manages the full process.
Ready to Start Your Boulder Project?
Whether you’re building an ADU, remodeling below the Flatirons, or constructing a custom home in Boulder, PrimeStone’s structural engineer–owned team delivers quality, energy-efficient results.
Get a Free Consultation → 720-468-0686 · info@primestonecg.com