Welcome to


by Mile High Designs


Renovations & Additions

Start living the life you deserve in your reimagined space. 


Decks, Covers, Pergolas

Create the perfect home base for all your outdoor activities.


Designed with you in mind.

Home renovations as unique as you are.


by Mile High Designs

Mile High Designs started as a small two man subcontracting crew in 2005. With a lot of hard work, we’ve grown into a highly rated family business with a team of valued employees and trade partners ready to transform homes throughout the Denver metro area and mountain communities along Hwy 285 and I-70.

After lots of consideration, in 2019 we started making the transition to doing business as Highline. There are so many ‘Mile High’ service companies out there and we don’t want to be mistaken for other less than stellar competitors.

But don’t worry, Highline is still delivering the same award winning service that made your friends and family refer you to Mile High Designs. 


Our clients love us — we love them more.




GOOGLE Reviews

Yelp, BBB, Insta & More


Check out what we’re building in your neighborhood.

What can we build for you?

Interior Remodeling Project Gallery

Basements, Kitchens, Bathrooms & More

Take Me Indoors
Exterior Remodeling Project Gallery

Decks, Covers, Pergolas & More

Take Me Outdoors

The details are not the details. They make the design.

We’ve given thought to every detail within our company to provide truly exceptional value and service on each and every project. And we want you to have complimentary access to those details too!

24/7 access on the BUILDERTREND site and app.

Secure messaging and access to files.

View scheduling and project progress photos. 


The Highline Team

Over 30 combined years of industry experience.

Ray Dertz

Owner & General Manager

All Employee Classified Team Members

Covered by Workers Comp Insurance

Ben Campbell

Project Foreman


Words of praise from some of our favorite homewowners.

We did a lot of research on all the organizations and selected Highline based on recommendations, BBB ratings and most of all on the personalized involvement by Ray. Ray’s willingness to come back several times as well as his creativity in both design and color selection made the decision even easier. Beyond the creativity and involvement was the exceptional work ethic and professionalism of the construction crew. In the construction industry it is unusual to find individuals that start when they say they will, work until it is dark and beyond and deliver a quality product that exceeds your expectations. The attention to detail was exceptional. As homeowners, one of the best decisions we have ever made was selecting Highline for our home improvement project.

Skip & Cathy K.

Highlands Ranch, CO

Ray and the crew from Mile High Designs are amazing! I would not go with any other company!
Ray has done a master bath remodel for us and now a kitchen remodel and both jobs were beyond expectations! The quality of work was exceptional and the kitchen was done ahead of schedule…something that never occurs and was truly appreciated!! Ray is great about giving you ideas about what you can do, where to go look at fixtures and samples of things and where to find the best quality for the right price. This is most helpful for those of us who are unsure of exactly what to do or have trouble deciding! Next on the list is to replace our large above ground deck and maybe add a permanent covered structure. After seeing all the photos and in person work that he has done…I wouldn’t trust anyone else!! 

Vic & Mark W.

Littleton, CO

We used Highline to remodel our kitchen last year and because we were so impressed, we had them back this year to build a deck in our backyard. I could not be happier with the quality of work, the professionalism of Ray and his staff and how much they cared about the projects they worked on.  They were very helpful in providing advice on design elements and constantly communicated about everything through the duration. They developed a timeline and stuck to it. We bid out both projects and Highline’s pricing was competitive with other bids from comparable companies. We are planning on bringing them back again this fall to expand and remodel our bedroom closets.* I would recommend them to any family member, friend or anyone else. We are very impressed and everyone that comes over compliments us on the kitchen and deck. 

*We did go back and remodel their closets!

Shaun & Katie W.

Denver, CO

We’re open for business!

Outdoor remodeling consults and projects are being scheduled as usual.

Indoor at home consults are available on a case by case basis.   

As always, we welcome online inquiries, design consults and estimates. 

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Mailing Address

P.O. Box 631596 Littleton, CO 80163