Home Size Limits
In 2024, Boulder County imposed new restrictions on how much homeowners in unincorporated areas can expand their own homes — over the objections of its own Planning Commission.
The Previous Rule
Since 2008, Boulder County's Site Plan Review standards allowed homeowners in unincorporated areas to remodel or expand their homes up to 125% of the median residential floor area of their surrounding neighborhood. This was called the Presumptive Size Maximum. Homeowners could also request to exceed even the 125% threshold through a review process — and were approved 91% of the time.
For many families, this was part of their planning. You buy a house in Niwot, your family grows, you add a bedroom or expand the kitchen. The 125% standard gave reasonable room to grow.
The Moratorium
September 17, 2024
The Boulder County Commissioners approved a temporary six-month moratorium on processing applications for residential development larger than the neighborhood median — effectively dropping the limit from 125% to 100% overnight. The moratorium took effect January 17, 2025.
For homeowners who had been planning additions or renovations, the moratorium froze their projects with no warning. Sound familiar? It was the 2018 downtown development moratorium all over again — this time applied to people's homes instead of their businesses.
The Planning Commission Says No
March 20, 2025
When Boulder County staff proposed making the new limits permanent, the Boulder County Planning Commission voted unanimously to recommend denial. The commission also recommended lifting the moratorium early.
This was not a close call. The county's own advisory body — the group specifically tasked with evaluating land use policy — rejected the proposal outright.
The Commissioners Override
April 22, 2025
Despite the Planning Commission's unanimous recommendation, the Boulder County Commissioners voted 2-1 to approve permanent new limits. Commissioner Claire Levy dissented, citing inequities in the policy.
Old rule: Expand up to 125% of neighborhood median (with option to request more)
New rule: Expand up to the neighborhood median (100%) — with limited exceptions for smaller homes
Effective: May 13, 2025
"Neighborhood" defined as: Everything within 1,500 feet of your property
The new rules cap home expansions at the neighborhood median, with a sliding scale that provides some additional allowance for smaller homes. Residential floor area includes basements, garages, and storage sheds — not just living space. The practical effect is that many Niwot homeowners who had planned to expand their homes now cannot.
The Pattern
The home size limits follow a pattern that Niwot residents have seen before:
In 2018, the county imposed a development moratorium on downtown Niwot without consulting the businesses it affected. In 2023, the county imposed a minimum wage ordinance without consulting the businesses it applied to. In 2024, the county imposed home size restrictions on unincorporated homeowners — and when its own Planning Commission unanimously recommended against making them permanent, the commissioners overrode the recommendation.
In each case, Niwot had no authority to shape the decision, no standing to negotiate, and no recourse except to petition the same body that made the decision. This is what it means to be unincorporated: someone else decides what you can do with your own property, your own business, and your own home.
An incorporated town sets its own land use policy. Its residents decide what their neighborhoods should look like — not a county government where they hold 1.3% of the vote.