Before You Build in Westminster, 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 Westminster. 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 Westminster. 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.
Retaining Walls
Some RestrictionsWestminster requires permits for retaining walls above a certain height, typically 4 feet. Engineering review may be required for taller walls.
Permit Requirements
Some RestrictionsStandard fences under 6 to 8 feet typically don’t require permits in Westminster. Taller and masonry fences may need building permits.
Height Limits
Some RestrictionsWestminster limits residential fences: typically 6 feet in rear/side, 4 feet in front yard. Corner lots have visibility requirements.
Pool Barriers
Heavy RestrictionsWestminster 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.
Fencing Requirements
Heavy RestrictionsWestminster requires pool barriers to prevent unsupervised child access. Minimum 48-inch height. Self-closing, self-latching gates required.
Above-Ground Pools
Some RestrictionsWestminster regulates above-ground pools including permit requirements, setbacks, and barrier standards. Pools over a certain depth or capacity typically require permits.
Pool Permits
Some RestrictionsWestminster requires building permits for pools, spas, and hot tubs. Inspections required for electrical, plumbing, and barriers.
Safety Rules
Heavy RestrictionsWestminster enforces pool safety requirements including anti-entrapment drain covers (VGB Act), barriers, alarms, and depth markers.
Hot Tub Rules
Some RestrictionsWestminster regulates hot tub and spa installation including electrical permits, barrier requirements, and placement rules.
ADUs & Granny Flats
Some RestrictionsAccessory dwelling unit rules and garage conversion permits.
ADU Rules
Some RestrictionsWestminster regulates ADUs through local zoning. Colorado HB 24-1152 requires certain municipalities to allow ADUs. Rules vary by city.
Garage Conversions
Some RestrictionsWestminster 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.
Carport Rules
Some RestrictionsWestminster requires permits for carport construction. Setback requirements, height limits, and lot coverage maximums apply.
Tiny Homes
Some RestrictionsWestminster regulates tiny homes differently based on whether they are on a permanent foundation or on wheels. Zoning and minimum square footage requirements apply.
Shed Rules
Few RestrictionsWestminster allows small sheds without permits (typically under 120 to 200 sq ft). Larger structures need building permits. Setback requirements apply.
Fire Pits & Outdoor Structures
Some RestrictionsFire pit placement, outdoor burning restrictions, and permits.
Fire Pit Rules
Some RestrictionsWestminster 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. Westminster may prohibit most outdoor burning. County burn bans common during fire season.
Landscaping & Tree Removal
Some RestrictionsTree removal permits, heritage tree protections, and water rules.
Tree Removal & Heritage Trees
Some RestrictionsWestminster regulates tree removal on private property through permits and size thresholds. Street trees are city-managed and cannot be removed by residents.
Water Restrictions
Some RestrictionsWestminster enforces water conservation under local water provider rules. Watering days designated. CRS §37-60-126 protects xeriscaping from HOA bans.
Tree Trimming
Some RestrictionsWestminster may protect certain tree species. Street trees are city property. Heritage trees may require permits for removal.
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.
Permit Guides for Nearby Cities
Looking for rules beyond permits? View all ordinances we track for Westminster.