Attached ADU

Attached ADU construction in Denver.

+1-720-605-7785

TRUSTED BY DENVER HOMEOWNERS

Our Credentials & Reviews

★★★★★

5.0 Rating

★★★★★

5.0 Rating

Preferred Contractor

A+ Rating

★★★★★

5-Star Business

NRCA Member

Connected Yet Independent

Peak Builders constructs attached ADUs throughout Denver. An attached ADU is built as an addition to your existing home, sharing at least one wall. This approach often costs less than detached construction while still providing independent living quarters.

Lower construction costs

Shared utility connections

Easier to age in place

Internal or external access options

Simpler permitting process

Peak Builders & Roofers of Denver provides professional attached adu services throughout Denver. Our experienced team delivers quality workmanship and reliable results for every project. We understand the specific needs of Colorado homes and tailor our approach accordingly.

We stand behind our work with clear communication, fair pricing, and attention to detail. Every project receives the same level of care, from initial consultation through final walkthrough. Your satisfaction is backed by our warranties and responsive service team.

Our Work

Attached ADU Construction in Denver — Project Photos

Why Choose Us

Quality Craftsmanship You Can Trust

With over 15 years of experience serving Denver homeowners, we bring expertise, quality materials, and exceptional craftsmanship to every project. Our team is fully licensed, bonded, and insured for your peace of mind.

Your project, our proven process.

Free Consultation

We visit your home, discuss your vision, and provide a detailed estimate with no obligation.

Design & Planning

Our team creates custom plans and handles all permits with the city of Denver.

Expert Construction

Licensed craftsmen bring your project to life with quality materials and workmanship.

Final Walkthrough

Inspection, quality assurance, and warranty coverage ensure your complete satisfaction.

Attached ADU Options

Testimonials

Real projects. Real results.

Hear from Denver homeowners who trusted Peak Builders with their most important investment.

Sarah M.

Peak Builders transformed our outdated kitchen into a stunning modern space. Their attention to detail and craftsmanship exceeded our expectations.

Kitchen Remodel, Denver

Michael & Jennifer T.

We hired Peak Builders to finish our basement and couldn't be happier. They handled permits, design, and construction seamlessly.

Basement Finishing, Highlands Ranch

Robert K.

After a hail storm damaged our roof, Peak Builders made the insurance process easy. They documented everything and installed a beautiful new roof.

Roof Replacement, Aurora

Lisa & David P.

Our master bathroom went from dated to spa-like thanks to Peak Builders. The frameless shower and heated floors are exactly what we envisioned.

Master Bath Renovation, Lakewood

James H.

Peak Builders built an ADU in our backyard that's now generating rental income. They navigated Denver's permit process expertly.

ADU Construction, Denver

Amanda R.

We bought a 1970s home and Peak Builders helped us transform every room. It's like a brand new house. Amazing team!

Full Home Remodel, Centennial

Carlos & Maria G.

Our outdoor kitchen from Peak Builders is the envy of the neighborhood. Built-in grill, pizza oven, and beautiful stone counters.

Outdoor Kitchen, Arvada

Patricia W.

Peak Builders remodeled our kitchen and two bathrooms. Having one contractor for the whole project made everything easier.

Kitchen & Bath Combo, Westminster

Thomas & Susan B.

We added a second story to our ranch home. Peak Builders matched the new addition perfectly to our existing home.

Home Addition, Parker

Read All 12+ Reviews

Attached ADU FAQs

An attached ADU shares one or more walls with the main house but has its own entrance, kitchen, and living space. It's fully separate inside while being physically connected to the existing structure.

Often yes — you share one or more foundation walls and sometimes a roof section, which reduces framing and weatherproofing costs. The savings vary by design. A detached ADU gives more privacy; an attached ADU is typically faster and less expensive.

Usually yes — we open a shared wall for access (if desired), add a separate exterior entrance, and may reinforce the shared structure. A structural engineer reviews every attached ADU project.

Yes. Attached garage conversions are one of the most cost-effective ADU paths. The slab, walls, and roof structure already exist. The work involves insulation, interior framing, plumbing, electrical, and HVAC.