Planning · Value · Improvements
Improving your home? See the true return.
Typical costs first, then your loan, top-up and the value you expect.
Kitchen
$15,000–$45,000
CheckMyBuilder NZ cost index (reviewed Jul 2026) ↗ · checked 3 Nov 2026Bathroom
$8,000–$35,000
CheckMyBuilder NZ cost index (reviewed Jul 2026) ↗ · checked 3 Nov 2026New bedroom
$2,500–$4,000 per m²
CheckMyBuilder NZ cost index — house extension (reviewed Jul 2026) ↗ · checked 3 Nov 2026New deck
$300–$900 per m²
CheckMyBuilder NZ cost index (reviewed Jul 2026) ↗ · checked 3 Nov 2026New fence
$3,500–$15,000
CheckMyBuilder NZ cost index (reviewed Jul 2026) ↗ · checked 3 Nov 2026Single garage
$22,000–$38,000
CheckMyBuilder NZ garage guide (reviewed Jul 2026) ↗ · checked 3 Nov 2026Double garage
$42,000–$70,000
CheckMyBuilder NZ garage guide (reviewed Jul 2026) ↗ · checked 3 Nov 2026Sleep-out
$15,000–$50,000
The Smoko Brief NZ sleepout guide 2025 ↗ · checked 3 Nov 2026
Your property
Your home's current market value — a recent council valuation or agent appraisal is fine.
$Existing loan
What you still owe on your mortgage today. Enter 0 if it's paid off.
$Your yearly mortgage rate, e.g. 5.5.
Top-up loan
Your yearly mortgage rate, e.g. 5.5.
Whole years from 1 to 40 before you sell.
Pick at least one improvement and enter its cost.
Typical costs are published estimates, not quotes. General information, not financial advice.