Refinancing to Pay for Renovations
Your mortgage is usually the cheapest way to fund a renovation. How you borrow depends on the size of the job: a simple top-up for a bathroom, something closer to a construction loan for an extension.
Match the loan to the size of the job
| Job | Usual funding | What the lender wants |
|---|---|---|
| Small: paint, carpet, heat pump, insulation | Top-up, or a revolving credit facility | Equity and affordability. Often no quotes. |
| Medium: kitchen, bathroom, re-roof, deck | Top-up or refinance with extra borrowing | Quotes, and sometimes a valuation. |
| Large: extension, second storey, recladding | Construction-style loan drawn in stages | Consented plans, a fixed-price contract, and an 'as if complete' valuation. |
Small and medium jobs
If the total loan after the renovation stays within 80% of your home's current value, this is straightforward. The lender checks you can afford the larger loan and may ask for quotes. The money is paid to your account and you pay the tradespeople.
Ask your own bank first. A mortgage top-up avoids legal fees. If the bank won't lend enough or its rate is poor, refinancing with the extra built in is the alternative. And if your fixed term is ending anyway, it's a good moment to compare both.
Large jobs work differently
For structural work, lenders don't hand over the full amount up front. They lend against what the house will be worth when finished, using an 'as if complete' valuation, and release money in progress payments as stages are done. You pay interest only on what's been drawn.
You'll need building consent, a fixed-price contract with a licensed builder, and a contingency, because renovations of older homes find surprises. Lenders are cautious about owner-managed projects and labour-only contracts. More in our guide to progress payments.
Will the work add what it costs?
Often not, and that's fine if you're doing it to enjoy living there. It matters when you're near the 80% line. A $120,000 kitchen might add $70,000 to the valuation. If the plan only works on the assumption that value rises dollar for dollar, have a valuer look before you commit.
Structure it so it gets repaid
Put renovation borrowing in a separate loan split with a term of five to ten years. Spread over the remaining life of the mortgage, a new kitchen costs far more in interest than its price tag suggests.
This article explains how New Zealand lenders generally assess these situations. It is general information, not personalised financial advice, and lender policy changes often — check your own position with a registered adviser. Official sources: Reserve Bank of New Zealand for lending policy and the OCR, and Sorted.org.nz for independent government-backed money guidance.
Renovation finance: common questions
Planning a renovation?
Tell us the rough cost, what your home is worth and what you owe. We'll tell you how much lenders will release and the simplest way to borrow it.
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