Gallatin County · Gallatin County Building Department
Renovation in Four Corners
County jurisdiction, acreage lots, wells and septic. A different set of constraints from in-town work.
What building here actually involves
Four Corners is unincorporated, so permits go through Gallatin County rather than a city department, and the review path is different. More importantly, most properties are on private wells and septic systems, which puts a hard constraint on any project that adds bedrooms.
A septic system is permitted for a specific number of bedrooms. Adding a bedroom in a basement or an addition can require a septic evaluation and sometimes a system expansion, and that has to be established before the design is finalised, not after. We raise it on the first site walk every time.
Well capacity matters too. Adding bathrooms to a house on a marginal well means testing the recovery rate and, occasionally, adding storage.
Local constraints
Four things that are specific to Four Corners
Jurisdiction
Gallatin County Building Department, not a city department.
Septic bedroom count
Adding a bedroom may require a septic evaluation or expansion. Confirm before design.
Well capacity
New bathrooms should be checked against the well's recovery rate.
Frost depth
36 to 42 inches depending on exposure and elevation.
Housing stock
1990s to 2010s custom homes on acreage, some older agricultural buildings
Neighbourhoods we work in
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