Boise · Ada County, Idaho
We Buy Property in Boise, Idaho
Boise is the largest city in Ada County at roughly 238,000 people, and the slowest growing — about 1.0% between the 2020 census base and the 2024 estimate, against 61.4% in Star and 21.0% in Kuna. A market that is not adding people is a market where the existing housing stock, and its condition, does most of the work.
We buy houses, infill lots, multifamily, office and industrial property across the city.
237,963
Residents
Census Bureau, Population Estimates Vintage 2024
1%
Growth
2020 census base to 2024 estimate, same vintage
Ada
County
Ada County
The foothills overlay changes what a buyer can do
Boise maintains a Wildland Urban Interface Overlay covering land at higher risk of wildland fire. Its provisions apply to all new structures and additions built after its effective date, and to renovations that increase an existing structure's gross floor area by more than 49 percent. Interior-only renovations are excepted regardless of area.
For a seller in the foothills that threshold matters more than it first appears. A buyer planning a modest addition may stay outside it; a buyer planning to nearly half again the size of the house does not, and their construction costs change accordingly. It is a question worth knowing the answer to before you price the property.
Sewer connection is mandatory, and there may be a second fee
Residential and commercial buildings in Boise must connect to the city sewer system, which Public Works operates across more than 1,000 miles of pipe. That is a straightforward contrast with unincorporated Ada County, where on-site septic is permitted under Central District Health.
Less well known is the assessment fee. Boise charges a one-time assessment, separate from the connection fee, for properties that have never been developed or never connected. The city names three cases where it will likely apply: building on a lot being split, building on a previously undeveloped lot, and connecting an existing building to sanitary sewer.
If you are selling an infill lot or a parcel you have split, that fee lands on your buyer's numbers and therefore on your price. The city publishes no amounts, so we do not quote one — but the cost is real and it is worth asking about before you assume a lot is clean.
Flooding here has three sources, not one
Boise participates in the National Flood Insurance Program because of flood threats from the Boise River, from foothills gulches, and from several intermittent stream channels on the upper bench. Properties nowhere near the river can sit in a mapped hazard area for the second or third reason.
Ada County adopted new FEMA Flood Insurance Rate Maps in June 2020, and any development in the floodplain requires a Floodplain Development Permit. We do not tell sellers what zone their property is in — that comes from the current FEMA map for the specific address, and nowhere else.
A flat market makes condition the variable
Boise added roughly 1.0% to its population between the 2020 census base and the 2024 estimate. Meridian added 18.6% and Star 61.4% over the same period. Where a city is not absorbing new arrivals, prices are set far more by the condition and character of the houses already standing than by pressure from newcomers.
Boise's median age was 37.9 in 2022, against 47.1 in Garden City and 30.2 in Kuna. That spread across a single county is a reasonable proxy for very different housing stock and very different reasons for selling — estates and downsizing at one end, growing households at the other.
For a seller it means the honest comparison is not against what a similar house fetched in Meridian last quarter. It is against what your house, in its condition, is worth to the buyers actually in this market.
Infill lots carry costs that are easy to miss
A lot split in Boise touches several things at once. The sewer assessment fee applies to previously undeveloped ground and to lots being split. The Assessor, who maintains parcel boundaries and Records of Survey, also runs addressing for every parcel in the county, so a new lot needs an address before it is a usable thing.
Idaho's domestic water statute is worth knowing here too, even inside the city: it caps domestic use at 13,000 gallons a day including half an acre of irrigation, and expressly excludes subdivisions of five or more lots and multiple-dwelling developments. That is a constraint on what a parcel can become, not just on how it is watered — and the statute was amended twice in two years, so it is worth checking rather than assuming.
None of this makes an infill lot a bad asset. It means the number a buyer can pay is the residual after those costs, and a seller who knows them is negotiating from the same page.
What that means for the offer
A Boise property with an overlay, an unconnected lot or a mapped flood hazard is not a property we decline. It is a property whose costs we have to count before we can put a number on it, and counting them out loud is how we would rather work.
When we make an offer we show the after-repair value we used, the work we think the property needs, our holding costs and the spread we run on. You can check every line of it against the same public records we used.
Elsewhere in Ada County
Where this comes from
Every factual statement above is traced to a published source, quoted below in the source's own words. Statutes and county practice change; each entry carries the date we last checked it.
Wildland Urban Interface Overlay — City of Boise
City of Boise
The City of Boise has a Wildland Urban Interface Overlay (WUI-O) zoning district covering land at higher risk of wildland fire, whose provisions apply to all new structures and additions built after its effective date and to renovations that increase a structure's gross floor area by more than 49 percent.
“The purpose of the WUI-O is to reduce the risks to human life, property, livelihoods, and wildlife within areas with higher risk of wildfire, and to recognize and clarify the respective roles of the city and property owners in the WUI-O to reduce those risks. ... The provisions of this Section 11-02-07.3.H shall apply to the following activities ... i. All new structures and additions to structures constructed in the WUI-O after the Effective Date; and ii. Renovation or modification of primary and accessory structures existing on the Effective Date that increase the gross floor area of the structure on the Effective Date by more than 49 percent.”
Checked 2026-09-09
Sewer Connections and Fees — City of Boise Public Works
City of Boise
Residential and commercial buildings in Boise must connect to the city sewer system, which the Public Works Department operates across more than 1,000 miles of pipe.
“Residential and commercial buildings must connect to the sewer system.”
Checked 2026-09-09
Boise charges a one-time sewer assessment fee, separate from connection fees, for properties that have never been developed or never connected; it is likely to apply when building on a lot being split, building on a previously undeveloped lot, or connecting an existing building to sanitary sewer.
“If you are building on an existing lot which is being split, building on a previously undeveloped lot or connecting an existing building to sanitary sewer, the assessment component of the connection fees will likely be required.”
Checked 2026-09-09
Water, Wastewater & Septic — Central District Health
Central District Health
Central District Health's Environmental Health Division permits septic systems, reviews land development applications and verifies the location of shallow injection wells across Ada, Boise, Elmore and Valley counties.
“Environmental Health Specialists at Central District Health (CDH) permit septic systems, review land development applications and verify location of shallow injection wells to ensure reliable and safe water resources for the community.”
Checked 2026-09-09
Floodplain Information — City of Boise
City of Boise
Boise participates in the National Flood Insurance Program because of significant flood threats from the Boise River, foothills gulches and several intermittent stream channels on the upper bench.
“The City of Boise participates in the National Flood Insurance Program due to the existence of significant flood threats related to the Boise River, foothills gulches and several intermittent stream channels on the upper bench.”
Checked 2026-09-09
Hazardous Overlay Districts — Ada County Development Services
Ada County Development Services
Ada County adopted new FEMA Flood Insurance Rate Maps in June 2020.
“In June, 2020, Ada County adopted the new FEMA Flood Insurance Rate Maps.”
Checked 2026-09-09
Any development within the floodplain in Ada County requires a Floodplain Development Permit, and the technical definition of floodplain for development purposes is in Ada County Ordinance 835.
“Any development within the Floodplain will require a Floodplain Development Permit.”
Checked 2026-09-09
Population Estimates, Vintage 2024 — Subcounty Resident Population
U.S. Census Bureau
Population growth across Ada County's cities diverged sharply between the 2020 census base and the 2024 estimate: Star +61.4%, Kuna +21.0%, Meridian +18.6%, Eagle +7.4%, Garden City +5.1%, Boise +1.0%.
Checked 2026-09-09
Comprehensive Population Demographics — Ada County
Ada County
Median age varies sharply across Ada County's cities: Kuna 30.2, Boise 37.9, Meridian 38.7, Star 41.4, Eagle 46.8 and Garden City 47.1, against a county median of 39.1 (2022).
Checked 2026-09-09
Assessor's Property Records — Ada County Assessor
Ada County Assessor
The Ada County Assessor maintains comprehensive property records on all real and personal property in the county — parcel ownership, land and improvement characteristics, parcel boundaries and road rights-of-way — and manages the addressing process for all parcels in the county. Its online maps carry parcel boundaries, streets, hydrography, section boundaries, city limits, parks and schools, alongside Records of Survey and subdivision plats.
“The Ada County Assessor's Office maintains comprehensive property records on all real and personal property within the county. This includes, parcel ownership, land and improvement characteristics, parcel boundaries, road rights-of-way, and the office also manages the addressing processes for all parcels within the county.”
Checked 2026-09-09
Idaho Code § 42-111 — Domestic purposes defined
Idaho State Legislature
Amendment history
[(42-111) 1899, p. 380, part of sec. 12; reen. R.C. & C.L., sec. 3250; C.S., sec. 5566; I.C.A., sec. 41-111; am. 1990, ch. 319, sec. 1, p. 870; am. 1995, ch. 233, sec. 1, p. 790; am. 2025, ch. 129, sec. 1, p. 663; am. 2026, ch. 2, sec. 1, p. 7.]
Idaho defines domestic water use as use for homes, camps, campgrounds and livestock including irrigation of up to half an acre, provided total use does not exceed 13,000 gallons per day; or any other use not exceeding 2.8 acre-feet per year.
“The use of water for homes, organization camps, public campgrounds, livestock, and for any other purpose in connection therewith, including irrigation of up to one-half (1/2) acre of land, if the total use does not exceed thirteen thousand (13,000) gallons per day; or 2. The use of water for any other purpose, if the total use does not exceed a diversion volume of two and eight-tenths (2.8) acre feet per year.”
Checked 2026-09-09
For Idaho's domestic water statutes a subdivision is a tract divided into five or more lots, parcels or sites for sale or building development, excluding a bona fide division of agricultural land into lots of five acres or larger maintained as agricultural land.
“"Subdivision" means a tract of land divided into five (5) or more lots, parcels, or sites for the purpose of sale or building development, whether immediate or future; provided that this definition shall not include a bona fide division or partition of agricultural land for agricultural purposes.”
Checked 2026-09-09
Start with the address.
One field. We will look at the parcel and the comparable sales, then come back with a number and the working behind it. No obligation, and no pressure if the answer is that you should list it instead.
Serving Boise, Meridian, Eagle, Kuna, Star, Garden City and unincorporated Ada County.