4 Bedroom Barndominium Floor Plans in Colorado

A four-bedroom barndominium is where the plan starts to decide the building. Spread across one level it becomes a long ranch with a large roof that has to carry your jurisdiction's snow load; stacked on two levels it gets taller and meets more wind. Add a guest suite with its own door and kitchen and, on many rural Colorado parcels, you have created a second dwelling that the well permit may not allow. Sorting those three questions early is what makes a four-bedroom plan buildable.

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What actually changes with this feature

The look is the easy part. These are the decisions that follow from it.

Ranch plan: one level, big roof

A single-level four-bedroom typically runs 2,200 to 3,000 square feet of living space, often on a 40-foot-wide clear span. It is the easiest plan to live in and to build on flat ground, and the roof is a simple gable. The cost is roof area: at higher elevations the purlins, frame spacing and connections all grow with the snow load.

Two-story: smaller roof, taller wall

Putting two or three bedrooms upstairs halves the footprint and roof. It also raises the sidewall, and taller walls mean more wind load on the frame and more bracing. On an exposed plains or foothill site, ask the building supplier to design to the wind speed your jurisdiction publishes for the parcel, not a default.

Guest suites and the well permit

A fourth bedroom used as a guest room is still part of one house. The Division of Water Resources' Guideline 2023-1 says an auxiliary living space with a separate entry and kitchen is generally considered a second single-family dwelling, and most exempt wells on parcels under 35 acres may serve only one. If the fourth bedroom is meant to become an in-law apartment, check the well permit and zoning before you add the kitchenette.

Egress for every bedroom, upstairs too

The IRC's emergency escape and rescue opening rule applies to every sleeping room, including upstairs bedrooms and lofts used for sleeping. Upstairs, the sill height and the window size have to work with the steel girts or post-frame wall framing, so set window positions before the building package is ordered.

The biggest family plan

Four bedrooms means choosing between more roof and more height

Every bedroom added to a one-level plan adds roof, and in Colorado the roof is the part your jurisdiction's snow load governs. Unincorporated Larimer County's design table shows how steeply that load rises with elevation — 55 psf of ground snow at 5,000 feet, 70 at 6,000, 110 at 8,000 — and the county limits IRC prescriptive construction to sites where ground snow does not exceed 70 psf and wind speeds are under 140 mph. Above that, the design moves to the building code and ASCE 7, which in practice means engineered framing. A two-story four-bedroom cuts the roof area roughly in half, but the taller wall catches more wind, and Larimer County's published basic wind speeds range from 115 to 225 mph depending on the site. Neither choice is wrong. The right one depends on your parcel's elevation and exposure, which is why we ask for the parcel before we draw.

Common ways to build this

Common configurations. Yours does not have to match one exactly — this is a starting point for the conversation, not a catalog.

One-level ranch with a split primary suite

2,600 sq ft living / 800 sq ft garage

Primary suite at one end, three bedrooms and two baths at the other, with the kitchen, dining and great room between them. Garage attached at the kitchen end. The simplest four-bedroom to build on a flat lot at modest elevation.

Two-story with bedrooms upstairs

1,400 sq ft main / 1,200 sq ft upper

Primary suite on the main floor for ageing in place, three bedrooms and a bath upstairs over part of the plan, with a vaulted great room on the rest. Roof area is roughly half of the ranch, which helps at high elevations; the taller sidewall is designed for the site's wind.

Main house plus attached guest wing

2,200 sq ft main house / 500 sq ft guest wing

The fourth bedroom and its bath sit in a wing reached from the main hall. Keep it inside the house — shared kitchen, no separate exterior entry and kitchen — if the parcel is on a household-use well, because a self-contained unit is generally a second dwelling to the Division of Water Resources.

Ways to build this

This can go together several ways. These are the service lines most relevant to it.

Custom Plans

Custom barndominium plans for Colorado: floor plans drawn around your land, snow load and soils, ready for a licensed engineer's seal where required.

Turnkey Builds

Turnkey barndominium builds in Colorado: one team from land and permits through well, septic, shell and finishes to a house you move into.

Steel Construction

Steel frame barndominiums in Colorado: red iron frames for wide, column-free spans, sized to the snow load and wind speed your county sets for your site.

4-Bedroom Barndominium: common questions

6 common questions about this layout in Colorado. If yours is not on the list, ask it directly.

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How much space does a 4-bedroom barndominium need?

Usually 2,200 to 3,000 square feet of living space on one level, or a smaller footprint on two levels. A 40x60 footprint (2,400 square feet) is a common starting point, with a shop or garage added alongside if the plan calls for one.

Is a two-story barndominium a good idea in Colorado?

Often, especially at higher elevations where the roof load is heavy, because two stories halve the roof. The trade-off is wind: taller walls catch more of it, and some Colorado jurisdictions publish high design wind speeds — unincorporated Larimer County's range from 115 to 225 mph depending on location. The frame is designed to whatever your jurisdiction sets for your parcel.

Can I add an in-law suite with its own kitchen?

Check two things first. Zoning: many counties limit the number of dwellings on a parcel or regulate accessory dwelling units. Water: the Division of Water Resources generally treats a space with a separate entry and kitchen as a second single-family dwelling, which most exempt wells on parcels under 35 acres cannot serve.

Who designs the frame for a large barndominium?

The steel or post-frame building supplier's Colorado-licensed engineer, working to your jurisdiction's snow, wind and seismic values. Unincorporated Larimer County, for example, allows IRC prescriptive construction only where ground snow is 70 psf or less and wind is under 140 mph; above that, the design follows the building code and ASCE 7. Many barndominium packages are engineered for the site regardless.

Does a bigger house need a bigger septic system?

It can. Septic permits in Colorado are issued by the county or district public health agency, and bedroom count is one of the first things they ask about, so raise the fourth bedroom before the system is designed rather than after. Ask early, too, because the soil testing for the septic system can shape where the house sits on the lot.

Can the fourth bedroom double as an office?

Yes, and that is a common choice. If it will be used as a bedroom at all, give it a compliant escape opening and a closet so it counts as one when you sell. An office in a basement is also where radon exposure matters most, so include radon-resistant construction if it is below grade.

Want this drawn for your program and your parcel? That is where a build actually starts.

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Start your plans

Tell us what you want to build and we will draw this for your program, then confirm what it looks like on your parcel and the frost depth, snow and wind loads your city or county publishes. That conversation costs nothing.

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