ADU Foundations

An ADU has to fit on a lot that already has a house, a yard, and tight access. We pour the foundation for backyard units and additions where a crew and a pump truck have to thread past a fence and a garden to reach the pour.

Built for a tight lot

Access is half the job on an infill ADU. We plan the pour route, protect the existing home and landscaping, and form a clean foundation in the footprint you have, whether that is a slab, a stem wall, or piers.

Matched to the ADU type

Site-built, modular, or garage conversion, each one wants a different foundation. We pour to your plans and to Denver-area code, with the drainage and reinforcement the clay soil here demands.

What this service covers

• Stem-wall and slab foundations
• Pier foundations for modular ADUs
• Garage-conversion footings
• Tight-access pours
• Utility trenching and sleeves
• Poured to local code

Built for the Front Range

Concrete behaves differently at altitude. Our expansive clay soils swell with moisture and shrink when they dry, and the freeze and thaw cycle works on any surface that takes on water. Every adu foundations project we pour accounts for both, from base preparation and drainage to air-entrained mixes, proper reinforcement, and control joints cut on time. That is how the work holds its shape and finish through Colorado winters instead of failing by spring.

You also get a written estimate before anything starts, a structural engineer on staff for the jobs that need one, and a crew that pulls and manages permits when the project calls for them. Licensed, bonded, and insured, with finishes that range from a clean broom texture to stamped, colored, and sealed.

What shapes your ADU Foundations project

Foundations are engineered, not estimated, and that is exactly why they hold up on Front Range soil. Here is what shapes a ADU Foundations project.

• The soils report. Expansive clay reacts differently lot to lot. A soils report tells the engineer how reactive the ground is and how to detail the foundation for it.
• Engineering and design. Footing depth, reinforcement, and slab details are designed to the load and the soil. This is the work that keeps a foundation from heaving and cracking.
• Depth and footings. Footings sit below frost and, on reactive soils, may reach down to stable material with piers or caissons. Depth is set by conditions, not convenience.
• Reinforcement. Steel ties the system together and resists the forces the soil and structure put on it. Placement follows the drawings.
• Site access and permits. Excavation access and the permitting and inspections the build requires both factor into the schedule and the cost, and we manage them.

Caring for your concrete

The single most important thing you can do for a adu foundations is control water. Keep gutters and downspouts carrying water well away from the foundation, maintain positive grading so the ground slopes away from the house, and watch for any new horizontal or stair-step cracking, which is worth a professional look. And whatever the project, the same rule applies across the Front Range: keep water from sitting on or soaking into the surface, and the concrete will reward you with decades of service.