Before You Build in Boulder, CO: Permit & Rule Checklist (2026)
Everything you need to know before starting a home improvement project
Building a fence, installing a pool, or adding a shed? Each project has its own set of local permits and rules in Boulder. This guide consolidates fence, pool, ADU, shed, fire pit, and landscaping regulations into one checklist so you know what to expect before you start.
Quick Permit Checklist
At-a-glance overview of permit categories in Boulder. Click any card for details.
Fences & Walls
5 rules on file
Swimming Pools
5 rules on file
ADUs & Granny Flats
2 rules on file
Sheds & Outbuildings
3 rules on file
Fire Pits & Outdoor Structures
2 rules on file
Landscaping & Tree Removal
3 rules on file
Fences & Walls
Heavy RestrictionsHeight limits, materials, permits, and shared fence rules.
Neighbor Fence Rules
Few RestrictionsColorado has no shared fence cost statute. Each property owner is responsible for their own fence. No equivalent to California’s Good Neighbor Fence Act.
Permit Requirements
Some RestrictionsStandard fences under 6 to 8 feet typically don’t require permits in Boulder. Taller and masonry fences may need building permits.
Height Limits
Some RestrictionsBoulder limits residential fences: typically 6 feet in rear/side, 4 feet in front yard. Corner lots have visibility requirements.
Retaining Walls
Some RestrictionsBoulder requires permits for retaining walls above a certain height, typically 4 feet. Engineering review may be required for taller walls.
Pool Barriers
Heavy RestrictionsBoulder requires pool barriers meeting safety codes to prevent drowning. Fences must be at least 4 to 5 feet tall with self-closing, self-latching gates.
Swimming Pools
Heavy RestrictionsPool permits, safety fencing, and drainage requirements.
Safety Rules
Heavy RestrictionsBoulder enforces pool safety requirements including anti-entrapment drain covers (VGB Act), barriers, alarms, and depth markers.
Fencing Requirements
Heavy RestrictionsBoulder requires pool barriers to prevent unsupervised child access. Minimum 48-inch height. Self-closing, self-latching gates required.
Pool Permits
Some RestrictionsBoulder requires building permits for pools, spas, and hot tubs. Inspections required for electrical, plumbing, and barriers.
Hot Tub Rules
Some RestrictionsBoulder regulates hot tub and spa installation including electrical permits, barrier requirements, and placement rules.
Above-Ground Pools
Some RestrictionsBoulder regulates above-ground pools including permit requirements, setbacks, and barrier standards. Pools over a certain depth or capacity typically require permits.
ADUs & Granny Flats
Some RestrictionsAccessory dwelling unit rules and garage conversion permits.
ADU Rules
Some RestrictionsBoulder allows ADUs on most residential lots. The city adopted progressive ADU regulations permitting both attached and detached units with streamlined permitting for smaller units under 500 square feet.
Garage Conversions
Some RestrictionsBoulder may allow garage conversions with permits. Colorado has no statewide garage conversion mandate. Replacement parking may be required.
Sheds & Outbuildings
Some RestrictionsShed permits, setback limits, and outbuilding size rules.
Shed Rules
Few RestrictionsBoulder allows small sheds without permits (typically under 120 to 200 sq ft). Larger structures need building permits. Setback requirements apply.
Carport Rules
Some RestrictionsBoulder requires permits for carport construction. Setback requirements, height limits, and lot coverage maximums apply.
Tiny Homes
Some RestrictionsBoulder regulates tiny homes differently based on whether they are on a permanent foundation or on wheels. Zoning and minimum square footage requirements apply.
Fire Pits & Outdoor Structures
Some RestrictionsFire pit placement, outdoor burning restrictions, and permits.
Fire Pit Rules
Some RestrictionsBoulder allows recreational fire pits with conditions. County burn bans apply during fire season. Gas pits typically exempt from burn bans.
Outdoor Burning
Some RestrictionsOutdoor burning regulated locally and by county. Boulder may prohibit most outdoor burning. County burn bans common during fire season.
Landscaping & Tree Removal
Heavy RestrictionsTree removal permits, heritage tree protections, and water rules.
Water Restrictions
Heavy RestrictionsBoulder enforces mandatory watering schedules through the city water utility. Odd/even address watering days, no watering 10 AM to 6 PM. Xeriscape rebate programs actively promoted.
Tree Trimming
Some RestrictionsBoulder may protect certain tree species. Street trees are city property. Heritage trees may require permits for removal.
Tree Removal & Heritage Trees
Some RestrictionsBoulder regulates tree removal on private property through permits and size thresholds. Street trees are city-managed and cannot be removed by residents.
General Permit Tips
When do you typically need a permit?
Most cities require permits for structural work, including fences over a certain height, pools, ADUs, and sheds above a size threshold. Even projects that seem minor can trigger permit requirements, so it is always best to check first.
How to apply for a building permit
Visit your local building department or their website. Most jurisdictions accept online applications. You will typically need a site plan, project description, and may need contractor information. Processing times vary from same-day for simple projects to several weeks for larger builds.
Common permit violations to avoid
Building without a permit, exceeding approved dimensions, and ignoring setback requirements are the most common violations. Penalties can include fines, required removal of the structure, and complications when selling your home.
Looking for rules beyond permits? View all ordinances we track for Boulder.