Welcome to HIGHLINE by Mile High Designs.

Modified outdoor at home consults and online quote/design consults available.
Our outdoor remodeling projects are still on schedule.


Renovations & Additions 

Don’t settle for ordinary. Highline can help you create a space that allows you to live the life you deserve. 


Decks, Covers & Pergolas

Partner with us to design an  ideal outdoor living space to fit your unique definition of the perfect Colorado lifestyle. 


Remodeling for your life. 

Highline knows that you don’t have a cookie cutter life so you don’t want a cookie cutter home. 

Who is Highline?

HIGHLINE by Mile High Designs

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

Coloradans love our Mile High nickname. Maybe a little too much and we’re tired of getting confused for other Mile High service businesses. Don’t worry, Highline is still delivering the same award winning service your friends and neighbors have come to expect over the years from Mile High Designs.

Fully Licensed 
Fully Insured 
EPA Lead Safe techniques to protect your family.
A+ rating with the BBB 
BBB Gold Star Certificate recipient 
Best of Houzz


Our clients 
love us. We love our clients more.

Don’t take our word for it. Find out for yourself. 




We’re all over the place!

Visit us on Instagram, Pinterest, Yelp & BBB

Hey Google…

See what else our clients have to say about us.
GOOGLE Reviews


Here’s some good old fashioned hand written testimonials from some of our favorite people.

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


Check out what we built for your neighbors. What can we create 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. 


Our Team Leaders

Over 30 combined years of industry experience.

Ray Dertz


Ray Dertz

Owner & Company Manager

Ben Campbell

Project Foreman

Ben Campbell

Project Leader 


All Inclusive Designs

Love our look but you’re not ready to commit?

Our a la cart design services start at only $250 for the most basic designs and include an on-site design consultation, project layout and a 3D rendering of your finalized design. Complex layouts, revisions and full framing plans are available for an additional fee. 

Go ahead and shop around. If you decide Highline is the contractor for you, and we think you will, design charges up to $500 are credited towards your down payment.*

*Terms and conditions apply


We’re open for business!

Modified outdoor at home consults are being scheduled on a case by case basis. As always, online quotes and design consults are available to all.  

This Coronavirus situation won’t last forever. Contact us today and give yourself the gift of something to look forward to.

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Mailing Address

P.O. Box 631596 Littleton, CO 80163