Boulder's #1 Deck Builder - Since 2013

Custom Deck and Fence Building in Boulder

DECKS

From redwood to cedar, and of course composite, we will design and build a deck of your dreams.

FENCES

Whether you choose wood, vinyl, or metal, we will design and build a fence that looks great and has utility.

Adding the perfect deck can give you extra space for all of your backyard needs for years to come!

And improve the curb appeal of your home. We are located in Boulder, Colorado, and cater to the needs of those in Boulder and the Front Range. Sit down with Alex Cosman to discuss the best options for both your family and home at no cost. We work with you to design and build the best decking and fencing, with the optimal materials selected for your space, needs and budget.

Why Choose Cosman Construction?

Experience and Details Matter

We’ve been building decks since 2013 and have completed thousands of projects. (hyperlink projects) All of our work is professionally done and we pride ourselves on our craftsmanship. At the end of each day, our team will clean up the site, making sure everything is safe and clean for children, pets, and family alike.

We Give You the Power to Make Decisions

Cosman Construction gives you options. We offer multiple material choices from lumber to composite decking and keep you, the homeowner behind the wheel, giving you the power to design your deck. If you like, we can even get down to the specifics like hardware choice. And we’ll make recommendations, based on your needs and our experience, every step of the way.

We Use Highest Quality, Long Lasting Materials

Whether we are using composite or hard wood, we select the highest quality options for your project that will last for years to come, with least amount of maintenance. Our materials withstand the harsh Colorado climate.

Your Satisfaction, Guaranteed!

Cosman Construction will always be one phone call away and be ready to meet your needs. Alex Cosman takes pride in his work. Check out our reviews to see the experience of our customers. We won’t finish a job until you are satisfied.