ADUs & Guest Houses
ADUs and guest houses in Caldwell add living space on a lot you already own. Boise Construction Co handles accessory dwelling projects for Caldwell and Canyon County, including detached units, garage conversions, and interior or basement units when the property allows. Boise ADU Co projects currently run through Boise Construction Co; that brand site is coming. Feasibility comes first: access, utilities, setbacks, and local requirements shape the plan before design. Request a quote and we reply within one business day with next steps.
ADUs & Guest Houses
ADUs & Guest Houses in Caldwell, Idaho
ADUs and guest houses in Caldwell add living space on a lot you already own. Boise Construction Co handles accessory dwelling projects for Caldwell and Canyon County, including detached units, garage conversions, and interior or basement units when the property allows. Boise ADU Co projects currently run through Boise Construction Co; that brand site is coming. Feasibility comes first: access, utilities, setbacks, and local requirements shape the plan before design. Request a quote and we reply within one business day with next steps.
Planning fromPriced after a site reviewYour exact range is confirmed at the free in-home visit
A CLEAR SCOPE
Plan the details.
Know the next step.
- 01Property and setback review for an accessory dwelling
- 02Layout planning for family, guests, or independent living
- 03Permit-ready drawings and local permit coordination
- 04Utility connection planning called out as separate lines
- 05Construction, inspections, and a written workmanship warranty
Why choose us
Why homeowners choose us
- 01
Feasibility before design, so setbacks and utilities shape the plan
- 02
One accountable team from drawings through the final walkthrough
- 03
Line-item budget with written allowances before construction
- 04
Boise ADU Co projects currently run through Boise Construction Co
How it works
Our process, step by step
01
Talk about the property
Share the address, intended use, and what you know about access, utilities, and the existing home.
02
Review feasibility
Confirm setbacks, utilities, parking, and jurisdiction rules before anyone draws a floor plan.
03
Design and budget
Develop the layout, selections, and a line-item budget with written allowances.
04
Permits and build
Coordinate approvals and construction, with written progress updates through handover.
Planning details
Typical timeline
Timeline depends on the unit size, whether it is attached or detached, utility extensions, and plan review. Many ADUs land inside a shorter window than a full custom home; we set a project-specific schedule after the site review.
Local details
Local notes
For adus & guest houses in Caldwell, confirm the property jurisdiction and scope before applying. City addresses and unincorporated county parcels may use different building departments. Confirm required building and trade permits, inspections and review times for the actual address.
ADUs & Guest Houses cost in Caldwell
Planning ranges for Caldwell match the broader Treasure Valley market. An ADU is priced from the property up: setbacks, utilities, access, and whether the unit is attached or detached shape the scope more than a generic square-foot figure.
Request a quote and we reply within one business day. A site review comes before a detailed proposal, so the first number you see is grounded in your lot.
ADUs & Guest Houses across Caldwell
We build throughout Caldwell, including Wilson. Indian Creek is the creek that flows through Kuna, Nampa, and Caldwell. Indian Creek Plaza is on that creek in downtown Caldwell. Lot conditions, utility access, and subdivision design standards vary between these areas, so we tailor the site plan, foundation, and elevations to the specific parcel rather than dropping a plan onto it.
As a local team familiar with Caldwell landmarks like Indian Creek Plaza, Caldwell Night Rodeo, College of Idaho, we understand how the area is developing and plan adus & guest houses that fits the neighborhood and holds its value.
New construction permits and plan review in Caldwell
Permits inside Caldwell city limits come from the City of Caldwell Building Safety Division. The city's first plan review takes about 7 to 10 business days once the application is complete and fees are paid, and each resubmittal restarts that clock. Addresses outside city limits go through the county instead; we check this for you at the first visit.
Addresses outside city limits go through the county instead; we check this for you at the first visit.
Our Caldwell designs also account for the local semi-arid high desert with four distinct seasons, from insulation and ventilation choices to frost depth, snow load, and materials that hold up to Treasure Valley freeze-thaw cycles.
Common questions
Frequently asked questions
ADU cost in Caldwell depends on size, existing conditions, utility connections, site work, and finishes. We price after a site review rather than publishing a single square-foot number that hides those variables.
No. Feasibility depends on the parcel, setbacks, utilities, and Caldwell or Canyon County requirements. A site-specific review is needed before confirming what can be built.
Yes. Detached ADUs, garage conversions, and basement or interior units are in scope when the property supports them. The suitable route depends on your lot and how the space will be used.
Yes. Caldwell is inside our Treasure Valley service area, and ADU projects there run through Boise Construction Co.
Request a quote with the address, intended use, and any photos or plans. We reply within one business day and schedule a site review before writing a line-item budget.
Property inside Caldwell city limits is permitted by the city building office; unincorporated addresses go through Canyon County. We check jurisdiction at the first visit and handle permits in-house.
Same service, nearby cities
Start your project
Ready to begin?
Free 60 to 90 minute in-home visit.
Planning guidance, design direction, no obligation.