Home Additions in Sheridan, CO

A home addition in Sheridan has to clear two separate official checks: the Building Department’s permit process, and the zoning rules that set how close a new addition can sit to the lot lines. The City of Sheridan Zoning Code publishes exact setback, height, and lot-coverage numbers for its residential districts, and our crew designs every Sheridan addition to fit inside them before the permit application goes in.

Res-SF Setbacks Set the Building Envelope

Most Sheridan single-family lots sit in the Res-SF district, where the zoning code sets a front setback of not less than 20 feet and a rear setback of not less than 20 feet. Side setback is 5 feet on each side as a baseline, with an additional 6 inches for every foot of building height above 15 feet — so a taller addition needs more side clearance than a single-story one.

There is one narrow-lot exception: on a lot that was less than 40 feet wide at its last recorded sale, the side setback drops to a minimum of 3 feet. We check the lot’s recorded width early, since it changes how much buildable width an addition actually has on a narrow parcel.

The Res-SFLL (large-lot) district follows the same setback structure with a larger minimum lot size. We confirm which district a property sits in before sketching an addition, since the zoning designation — not just the address — determines the setback math.

Height and Lot Coverage Limit How Big an Addition Can Be

Sheridan caps building height in the Res-SF district at 35 feet or two stories, whichever comes first. Lot coverage — every building on the lot, including accessory structures — cannot exceed 35% of the total lot area in Res-SF, or 40% in Res-SFLL and Res-MF.

On a Sheridan lot that already carries a house, a garage, and a shed, the coverage math can be tighter than the setbacks alone suggest. We run the coverage calculation against the existing structures before finalizing an addition’s footprint, since a design that clears every setback can still fail the coverage limit if the lot is already built up.

The Res-SF district also sets a minimum lot area of 6,000 square feet and minimum lot frontage of 60 feet, figures worth knowing if an addition project is paired with any lot-line or subdivision question.

Accessory Additions Follow Their Own Rules

A detached garage or accessory-structure addition is not held to the same setback line as the main house. Accessory buildings in Sheridan are capped at 15 feet in height, cannot sit in the front yard of the principal building, and need a rear and side setback of not less than 5 feet — except that a direct-entry garage needs a driveway of not less than 20 feet so a parked vehicle clears the right-of-way.

We plan garage and accessory additions against this separate rule set rather than the principal-building setback table, since applying the wrong numbers to a detached structure either wastes buildable area or risks a setback violation.

Floodplain Development Permits Near Mapped Flood Areas

Sheridan’s zoning code requires a floodplain development permit before construction or development begins within any area of special flood hazard shown on the city’s flood insurance study and flood insurance rate map. The application goes to the Building Department with scaled plans showing the structure, any fill or material storage, and drainage facilities, and the Zoning Administrator reviews it to confirm whether the site sits in a floodway.

Most Sheridan additions will not touch a mapped flood hazard area, but for a lot near a drainage corridor, we check the flood map before design work goes far, since a floodplain permit adds its own review step and documentation on top of the standard building permit.

Permitting, Fees, and Historic Review

An addition follows the same Contractor License and Building Permit Application process as any other Sheridan remodel: a licensed general contractor or a homeowner self-permit for an owner-occupied single-family home, with licensed electrical, plumbing, and mechanical subcontractors named on the application. The permit fee is valuation-based, plan review is a separate 65% of the permit fee due before review starts, and permit fees may be doubled if construction begins before the permit is issued.

We did not find a Sheridan-specific historic preservation or landmark-district ordinance on an official city page, so we treat that as an open question rather than assume it does not apply — if a property carries any National Register or State Inventory listing, we confirm directly with the Building Department whether any separate review applies before design work is finalized.

How We Sequence a Sheridan Home Addition

We start by confirming the zoning district, pulling the recorded lot width and area, and running the addition’s footprint against the front, rear, and side setbacks along with the lot coverage limit. If the site sits near a mapped flood hazard area, we check the floodplain permit requirement before finalizing the design.

Once the design fits the zoning envelope, we submit the building permit application with a full scope description, licensed trade contractors, and project valuation, and pay the plan review fee to start the process. After the permit is issued, construction follows standard order — foundation and framing first, then rough electrical, plumbing, and mechanical under the adopted 2021 IRC, IPC, and IMC, each inspected, followed by insulation, drywall, and finish work, closing with a final inspection.

Common Questions

How far does a Sheridan home addition have to sit from the property line?
In the Res-SF district, front and rear setbacks are not less than 20 feet, and side setbacks are not less than 5 feet, plus 6 additional inches for every foot of building height above 15 feet. Lots under 40 feet wide at their last recorded sale get a reduced 3-foot side setback.

How much of a Sheridan lot can be built on?
In the Res-SF district, all buildings on the lot, including accessory structures, cannot exceed 35% of the total lot area. Res-SFLL and Res-MF districts allow up to 40% lot coverage.

Does a Sheridan addition need a floodplain permit?
Only if the property falls within an area of special flood hazard on the city’s flood insurance rate map. A floodplain development permit is required before construction begins in that case, reviewed by the Zoning Administrator.

Does Sheridan have historic district review for additions?
We did not find a Sheridan-specific historic preservation or landmark-district ordinance on an official city page. If a property has any historic listing, we confirm directly with the Building Department whether separate review applies before finalizing a design.

Talk to Us About Your Project

Tell us about the addition you are planning in Sheridan, especially the lot size, existing structures, and how close you want to build to the property line. We handle the zoning check, permit application, and inspection scheduling from foundation through final sign-off.