Buy or build in Grimes.
237 homes changed hands in Grimes in the last twelve months, at a median of $354,500 — $232 a square foot. The 33 that were built in the last two years sold at $281: a $49 premium for new. That gap is the whole question, and the number comes from the county.
What actually sold.
Source: Polk County Assessor, recorded residential sales, twelve months to 2026-07-27 — arm’s-length sales between $100,000 and $2,000,000 of homes between 800 and 6,000 square feet. Reloaded weekly from the assessor’s public bulk exports. School districts in the sample: Dallas Center-Grimes (171), Johnston (66).
Live via FRED, Federal Reserve Bank of St. Louis, and the Polk County Assessor’s recorded sales · refreshed every six hours
Resale side from recorded Polk County sales, last twelve months; build side from metro cost estimates for this year, at this week's 6.76% (Freddie Mac). Enter an address below and the ledger re-runs against recorded sales for that street.
Buy
2 months to keys- Comparable resale, 2,400 sq ft$232/sq ft · median of 237 recorded Grimes sales, last 12 months
- $556,800
- Closing and inspectionabout 3%
- $16,704
Build
9 months to keys- Construction, mid finish$212/sq ft
- $508,800
- Lot in Grimestypical buildable lot
- $100,000
- Soft costspermits, design, survey, construction financing
- $48,704
Building costs more. About $84,000 over buying — close enough that the lot, the plan and your patience decide it.
About 14% of sales are homes built in the last two years — enough that resale prices reflect new stock, not enough to make lots plentiful. Owning a lot changes this ledger more than the finish level does.
27% of owners have been in place more than ten years; the rest of the parcels turn over regularly, so there is usually a comparable resale to price against.
Where it's a record, it's cited. Where it's an estimate, it says so.
- Rates
- Freddie Mac's weekly survey, by way of the St. Louis Fed. The ledger reprices every Thursday.
- Prices
- The FHFA house-price index for the Des Moines–West Des Moines metro, quarterly.
- Permits
- Private housing units authorized in Iowa, monthly, from the Census Bureau.
- Resale prices
- Median price per square foot from every arm's-length sale the Polk County Assessor recorded in the last twelve months, by city. Reloaded weekly from the assessor's public exports.
- Parcels
- The Polk County Assessor: assessed value, year built, lot size, and the last recorded sale for the address you give.
- Cost to build
- Metro estimates by finish level for the current year, replaced by street-level sales the moment you give an address.
Talk to the right person, once.
One central-Iowa custom builder we'd put our own name on. They see your ledger before the first call.
One agent who works the neighborhoods in the ledger — and who'll tell you if what you want doesn't exist yet.
Both links send your ledger first, so nobody starts from zero.