PE-stamped structural engineering for homeowners, builders, and architects across Denver, the Front Range, and Colorado’s mountain communities.
- Pillar height = service pages in that city
- Denver HQ
ISTA Engineers is headquartered in Denver and prepares PE-stamped structural plans, inspections, and reports for projects across Colorado, from Front Range suburbs to mountain towns.
Every jurisdiction adopts its own code edition and local amendments, so we confirm the governing code, snow load, and soil conditions for each address rather than relying on generic assumptions. Ground snow loads run roughly 30 psf in the Denver metro area and 40 to over 100 psf in mountain communities, and expansive clay soils are common along the Front Range. Find your city below to see the services we offer there.
Explore Our Service Areas
Select a city on the map to see the services we offer there. The Denver metro cities are zoomed in on the right.
5 service pages
Wheat Ridge, Colorado
- ADU in Wheat Ridge
- Foundation Inspection in Wheat Ridge
- Home Addition in Wheat Ridge
- Structural Inspection in Wheat Ridge
- Structural Modification in Wheat Ridge
Need something else in Wheat Ridge? ISTA Engineers takes on Wheat Ridge projects beyond the pages listed here. Tell us what you need.
5 service pages
Littleton, Colorado
- ADU in Littleton
- Foundation Inspection in Littleton
- Home Addition in Littleton
- Structural Inspection in Littleton
- Structural Modification in Littleton
Need something else in Littleton? ISTA Engineers takes on Littleton projects beyond the pages listed here. Tell us what you need.
5 service pages
Highlands Ranch, Colorado
- ADU in Highlands Ranch
- Foundation Inspection in Highlands Ranch
- Home Addition in Highlands Ranch
- Structural Inspection in Highlands Ranch
- Structural Modification in Highlands Ranch
Need something else in Highlands Ranch? ISTA Engineers takes on Highlands Ranch projects beyond the pages listed here. Tell us what you need.
5 service pages
Greeley, Colorado
- ADU in Greeley
- Foundation Inspection in Greeley
- Home Addition in Greeley
- Retaining Wall in Greeley
- Structural Inspection in Greeley
Need something else in Greeley? ISTA Engineers takes on Greeley projects beyond the pages listed here. Tell us what you need.
5 service pages
Fort Collins, Colorado
- ADU in Fort Collins
- Foundation Inspection in Fort Collins
- Home Addition in Fort Collins
- Retaining Wall in Fort Collins
- Structural Inspection in Fort Collins
Need something else in Fort Collins? ISTA Engineers takes on Fort Collins projects beyond the pages listed here. Tell us what you need.
5 service pages
Centennial, Colorado
- ADU in Centennial
- Foundation Inspection in Centennial
- Home Addition in Centennial
- Structural Inspection in Centennial
- Structural Modification in Centennial
Need something else in Centennial? ISTA Engineers takes on Centennial projects beyond the pages listed here. Tell us what you need.
5 service pages
Castle Rock, Colorado
- ADU in Castle Rock
- Deck Design in Castle Rock
- Foundation Inspection in Castle Rock
- Home Addition in Castle Rock
- Structural Inspection in Castle Rock
Need something else in Castle Rock? ISTA Engineers takes on Castle Rock projects beyond the pages listed here. Tell us what you need.
5 service pages
Vail, Colorado
- Drone Inspection in Vail
- Foundation Inspection in Vail
- Retaining Wall in Vail
- Structural Inspection in Vail
- Walk-Out Basement in Vail
Need something else in Vail? ISTA Engineers takes on Vail projects beyond the pages listed here. Tell us what you need.
7 service pages
Lakewood, Colorado
- ADU in Lakewood
- Drone Inspection in Lakewood
- Foundation Inspection in Lakewood
- Home Addition in Lakewood
- Structural Inspection in Lakewood
- Structural Modification in Lakewood
- Walk-Out Basement in Lakewood
Need something else in Lakewood? ISTA Engineers takes on Lakewood projects beyond the pages listed here. Tell us what you need.
9 service pages
Boulder, Colorado
- ADU in Boulder
- Deck Design in Boulder
- Drone Inspection in Boulder
- Foundation Inspection in Boulder
- Home Addition in Boulder
- Retaining Wall in Boulder
- Structural Inspection in Boulder
- Structural Modification in Boulder
- Walk-Out Basement in Boulder
Need something else in Boulder? ISTA Engineers takes on Boulder projects beyond the pages listed here. Tell us what you need.
7 service pages
Aurora, Colorado
- ADU in Aurora
- Drone Inspection in Aurora
- Foundation Inspection in Aurora
- Home Addition in Aurora
- Retaining Wall in Aurora
- Structural Inspection in Aurora
- Walk-Out Basement in Aurora
Need something else in Aurora? ISTA Engineers takes on Aurora projects beyond the pages listed here. Tell us what you need.
6 service pages
Westminster, Colorado
- ADU in Westminster
- Drone Inspection in Westminster
- Foundation Inspection in Westminster
- Structural Inspection in Westminster
- Structural Modification in Westminster
- Walk-Out Basement in Westminster
Need something else in Westminster? ISTA Engineers takes on Westminster projects beyond the pages listed here. Tell us what you need.
4 service pages
Broomfield, Colorado
- Drone Inspection in Broomfield
- Foundation Inspection in Broomfield
- Structural Inspection in Broomfield
- Walk-Out Basement in Broomfield
Need something else in Broomfield? ISTA Engineers takes on Broomfield projects beyond the pages listed here. Tell us what you need.
7 service pages
Golden, Colorado
- ADU in Golden
- Construction Inspection in Golden
- Drone Inspection in Golden
- Foundation Inspection in Golden
- Retaining Wall in Golden
- Structural Inspection in Golden
- Walk-Out Basement in Golden
Need something else in Golden? ISTA Engineers takes on Golden projects beyond the pages listed here. Tell us what you need.
7 service pages
Thornton, Colorado
- ADU in Thornton
- Construction Inspection in Thornton
- Drone Inspection in Thornton
- Foundation Inspection in Thornton
- Retaining Wall in Thornton
- Structural Inspection in Thornton
- Walk-Out Basement in Thornton
Need something else in Thornton? ISTA Engineers takes on Thornton projects beyond the pages listed here. Tell us what you need.
5 service pages
Aspen, Colorado
- Construction Inspection in Aspen
- Drone Inspection in Aspen
- Foundation Inspection in Aspen
- Structural Inspection in Aspen
- Walk-Out Basement in Aspen
Need something else in Aspen? ISTA Engineers takes on Aspen projects beyond the pages listed here. Tell us what you need.
6 service pages
Breckenridge, Colorado
- Construction Inspection in Breckenridge
- Drone Inspection in Breckenridge
- Foundation Inspection in Breckenridge
- Retaining Wall in Breckenridge
- Structural Inspection in Breckenridge
- Walk-Out Basement in Breckenridge
Need something else in Breckenridge? ISTA Engineers takes on Breckenridge projects beyond the pages listed here. Tell us what you need.
4 service pages
Colorado Springs, Colorado
- ADU in Colorado Springs
- Home Addition in Colorado Springs
- Retaining Wall in Colorado Springs
- Walk-Out Basement in Colorado Springs
Need something else in Colorado Springs? ISTA Engineers takes on Colorado Springs projects beyond the pages listed here. Tell us what you need.
6 service pages
Denver, Colorado
- ADU in Denver
- Deck Design in Denver
- Home Addition in Denver
- Retaining Wall in Denver
- Structural Modification in Denver
- Walk-Out Basement in Denver
Need something else in Denver? ISTA Engineers takes on Denver projects beyond the pages listed here. Tell us what you need.
Find Your City
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Boulder9 services
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Aurora7 services
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Golden7 services
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Lakewood7 services
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Thornton7 services
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Breckenridge6 services
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Denver6 services
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Westminster6 services
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Aspen5 services
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Castle Rock5 services
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Centennial5 services
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Fort Collins5 services
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Greeley5 services
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Highlands Ranch5 services
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Littleton5 services
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Vail5 services
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Wheat Ridge5 services
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Broomfield4 services
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Colorado Springs4 services
How We Work Across Colorado
- Local code first. We confirm the adopted code edition and local amendments for your jurisdiction before designing, so the stamped package matches what the plan reviewer expects.
- Site conditions, not averages. Snow load, frost depth, and soil conditions are checked for your actual address, from Front Range clay to high-country snow.
- One team for your project. We coordinate directly with your architect, general contractor, landlord, or builder so the structural scope keeps the permit moving.
Areas We Serve FAQ
Which areas does ISTA Engineers serve?
ISTA Engineers serves homeowners, builders, architects, and property owners across Colorado, including the Denver metro area, the Front Range, and mountain communities such as Aspen, Vail, and Breckenridge. The city pages above list the services available in each area.
Do you work in mountain towns like Aspen, Vail, and Breckenridge?
Yes. Mountain projects are designed for the higher ground snow loads and local design review common in those towns, and several of our services have dedicated pages for them.
My city is not listed. Can you still help?
Yes. The list shows cities with dedicated pages, not the limit of our service area. Contact us with your address and project, and we will confirm the governing code and scope.
Are the plans accepted by my local building department?
We prepare PE-stamped, permit-ready drawings and calculations tailored to the requirements of the jurisdiction where the project is built, and we respond to plan-review comments.
Start Your Project
Tell us your address and what you are building, and we will confirm the code, snow load, and scope for your area. Request a consultation or call (720) 740-4060.
Looking for the full service list instead? See all ISTA Engineers services.