Fire rules that favor metal
After the Marshall Fire destroyed 550 homes in Louisville in December 2021, according to Boulder County's damage assessment, the city adopted a Fire Hardening Code. Louisville's fence requirements handout spells out what it means for fences: all fencing within 5 feet of a building's exterior walls must be fire-resistant, with a flame spread index of 25 or less (Class A). The city notes that most metal fences qualify. Fencing beyond 5 feet can still be wood.
That rule applies to new construction and to replacements, so it affects anyone in Louisville replacing a fence next to the house. The site plan has to show where the Class A fence is and what it is made of.
Metal panels next to the houseHousing from the 1980s and 1990s
The American Community Survey (2020–2024) counts about 20,800 people and 8,500 housing units in Louisville. Most were built in the 1980s and 1990s, about 2,230 and 2,390 homes, with another 1,440 in the 2010s. Old Town Louisville around Main Street has the city's oldest houses, including about 300 built before 1940.
Louisville homes by decade built
American Community Survey, 2020–2024 five-year estimates
Built before 1990 Newer
Louisville's height and permit rules
Where a property has no PUD, fences follow Louisville Municipal Code 17.16.120: no more than 4 feet in any front yard and 6 feet elsewhere. Many neighborhoods have PUDs with their own fence designs and heights, which the city publishes on its land use and planning GIS map. The Fire Hardening Code overrides PUD design standards where they conflict.
Fence permit applications go through the city's Citizen Self Service portal, with a site plan drawn to scale. Louisville does not review private covenants, so HOA approval is separate.
Mixing metal and wood
Plenty of Louisville owners keep a wood fence along the back of the lot and switch to metal for the first 5 feet or more from the house. The transition is easiest at a post, with matching heights so the line reads as one fence. Steel panels with solid infill can give privacy similar to the wood fence beyond.
Neighborhoods near Coal Creek and Harper Lake often back onto open space, where an open metal fence keeps the view. Louisville is about 20 minutes from Westminster via US 36. See ornamental iron and steel fences for styles.
