Home Additions & Outdoor Living
PrimeStone Construction Group is a licensed, structural engineer–owned design-build contractor that adds space to Colorado homes. From a bump-out or second-story addition to a detached ADU, an attic conversion, or a new deck, one team handles design, engineering, permits, and construction, so every addition is tied into your existing home correctly.
Why Choose PrimeStone for Your Addition
An addition has to work with the home you already have: its foundation, roofline, and mechanical systems. That is where engineering matters most:
- Structural engineer–owned: New loads, openings, and tie-ins to your existing structure are engineered in-house.
- True design-build: Design, engineering, permits, and construction under one contract.
- Permits handled for you: We prepare applications and coordinate inspections with your local building department.
- Built for Colorado: Expansive soils, snow loads, and local codes are part of every plan.
Our Addition Services
Explore the ways we add space to Denver-area homes:
- Room Additions: bump-outs, ground-level additions, and second-story expansions
- ADU Construction: detached, garage, and basement accessory dwelling units
- Attic Conversion: bedrooms, offices, and living space under the roof
- Deck & Patio: engineered outdoor living spaces
Our Addition Process
A clear process keeps your addition on budget and on schedule, from the first site visit to the final inspection.
Consult & Feasibility
We review your property, goals, and budget and confirm what your lot and local zoning allow.
Design, Engineer & Permit
Plans and structural engineering are completed, and we prepare and manage the permits.
Build & Hand Over
We build to the engineered plans, coordinate inspections, and walk the finished space with you.
Helpful Guides: Home Addition Guides
Room Additions Near You
ADU Construction Near You
All Service Areas
Aspen · Aurora · Avon · Boulder · Breckenridge · Broomfield · Castle Rock · Centennial · Cherry Hills Village · Golden · Greenwood Village · Highlands Ranch · Lakewood · Silverthorne · Thornton · Vail · Westminster
Frequently asked questions
Quick answers about adding space with PrimeStone.
What is the difference between a room addition, an ADU, and an attic conversion?
Does an addition need structural engineering?
Do I need a permit for a home addition in Colorado?
Service List
Need any helps?
Questions about your project? Call us for a free consultation.