Published August 28, 2026
The instinct is that moving is cheaper than building. In the current Twin Cities market, that is frequently wrong — and the reason is transaction costs plus interest rate lock-in.
The worked example
A family in a 1,700 square foot Bloomington rambler worth $410,000 needs another bedroom and a second full bath.
Option A: Move to a 2,200 square foot comparable — $565,000
| Line | Cost |
|---|---|
| Price gap | $155,000 |
| Selling costs (6% commission + closing) | $27,000 |
| Buying closing costs (2.5%) | $14,000 |
| Moving | $4,000 |
| New-home immediate updates | $15,000 |
| Total | $215,000 |
Plus: if the current mortgage is at 3.25 percent and a new one is at 6.5 percent, the monthly payment difference on the retained balance alone runs several hundred dollars a month for thirty years. That is often the largest number in the whole comparison and it never shows up on a listing sheet.
Option B: 450 square foot addition with a bedroom and bath
| Line | Cost |
|---|---|
| Addition at $340/sq ft | $153,000 |
| Engineering, survey, permits | $6,000 |
| Landscaping restoration | $4,000 |
| Total | $163,000 |
Result: $52,000 cheaper to build, the low mortgage rate stays intact, the school district stays the same, and roughly 60 to 70 percent of the addition cost shows up in appraised value.
When moving genuinely wins
- You need more than 40 percent additional square footage — big additions get disproportionately expensive
- Your lot cannot take it — setbacks, coverage limits, or an easement block the footprint
- The house has other problems — failing foundation, obsolete layout, bad location
- You want a different school district, commute, or neighborhood
- You cannot tolerate five to nine months of living through a project
- Your current mortgage rate is at or above current market rates, which removes the lock-in advantage
When building wins
- You like the lot, the neighbors, and the school district
- You are adding 10 to 40 percent more space
- You have a mortgage rate well below market
- Your lot has room within setbacks
- The addition addresses a specific, definable gap — a bedroom, a bath, a main-floor primary suite
A quick test
Take the price of the house you would move to, subtract what yours would sell for, then add 9 percent of both prices for transaction costs. If that number is bigger than your addition quote, build. Then check your mortgage rate — if it is more than a point below market, weight the answer further toward building.
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Frequently asked questions
Is it cheaper to build an addition or move in Minnesota?
For a 10 to 40 percent space increase, building usually wins once you count 8 to 10 percent in transaction costs on both sides of a move plus the cost of giving up a below-market mortgage rate.
How do I compare an addition to buying a bigger house?
Take the target home price minus your home's value, add roughly 9 percent of both prices for transaction costs, and compare that total to your addition quote.
How much of an addition's cost comes back at resale?
Typically 60 to 70 percent appears in appraised value, with bedroom and bathroom additions performing better than bonus space.