Dave owns one rental in Whangārei. Every week it costs him about $120 to keep. He’s been waiting three years for rents to catch up. Last month he walked through a 1974 brick-and-tile at an open home. Orange carpet. A kitchen that still thinks it’s 1974. Everyone else left in four minutes. Dave stayed, because he’d spotted the second front door round the side.
This post is for investors who want a rental that pays its own way from day one. You’ll read why flat rents change the whole strategy, how Dave’s “ugly” house turns a loss into a profit (with the numbers), where the new granny flat rules fit in, and the fish hooks that sink these deals. Five minutes from now you’ll know exactly what to look for at your next open home.
The short version: National rents are flat [1] and rents on new tenancies fell over the past year [2], so waiting for rent growth is a bet. A structurally sound older home with two income streams can cover its costs at today’s rates. A standard single-tenancy house usually can’t. A slow market gives you time to find one [3].
Why won’t rising rents fix my rental’s cashflow?
Because they aren’t rising. The Trade Me national median rent sat at $620 a week in June 2026, flat on a year earlier [1]. Rents on new tenancies fell in the year to March 2026, and rent growth on existing tenancies was the lowest on record [2]. Meanwhile the Reserve Bank of New Zealand lifted the OCR to 2.75% in September and flagged more to come [4].
Dave’s been waiting for yield. The smarter move is to build it.
What’s happening to development costs and interest rates?
Both are heading up. The Cordell Construction Cost Index rose 3.5% in the year to June 2026, the fastest rise since mid-2023. Cotality’s Kelvin Davidson says the “exceptionally quiet period for construction cost inflation is probably behind us” [5]. New home consents rose 11% to 37,813 in the year to March [3], so contractors are getting busier again.
The OCR went to 2.75% on 2 September and may need to rise further [4]. Markets are pricing a peak around 4% [7]. Development debt sits well above home loan rates, so every move lands on your holding costs.
Why buy the ugly house?
Owner-occupiers pay for kitchens. Investors should pay for land and a floor plan that rents twice. A sound 1960s or 70s home with a separate downstairs flat, or a section with room for a minor dwelling, tends to attract fewer owner-occupier bidders. That’s my view from the deals I see, and it’s exactly why Dave had the open home to himself. Over 10 to 20 years the land usually does the heavy lifting on value, though that’s never guaranteed.
The market is on your side for the hunt. Homes are taking a median 51 days to sell and listings are up 9.7% on a year ago [3]. That means time for proper checks and room to negotiate.
Can a home and income property be cashflow positive?
Dave’s numbers: a $700,000 home with a self-contained downstairs flat. That’s just under Whangārei’s $727,000 median [5]. Investors generally need a 30% deposit on existing homes [6], so it’s $210,000 down and a $490,000 loan at an assumed 5.4%.
What should small developers watch?
- Two tenancies: $560 for the main house plus $380 for the flat makes $940 a week (Whangārei’s median rent is $580 [5]). Costs (rates, insurance, maintenance, management) are about $290. Interest-only repayments of about $509 leave roughly +$141 a week before tax. On principal and interest ($635), it’s about +$15 a week.
- Rented to one family: $650 a week, with slightly lower costs of about $270 for a single tenancy. On interest-only, that’s roughly −$129 a week.
Same house, same loan. The second front door is worth about $270 a week. Interest on residential rentals is currently fully deductible, and Labour has said that wouldn’t change under its policy [7]. All figures are illustrative, so check rents against MBIE bond data for your street.
Can I add a granny flat without a building consent?
Often, yes. Since 15 January 2026, a single-storey standalone dwelling of up to 70 square metres can be built without a building consent if it meets the exemption conditions and licensed building practitioners do or supervise the work. You’ll need a Project Information Memorandum from council first, and development contributions may apply [8]. No downstairs flat? A big back lawn might be the next best thing.
What are the fish hooks?
- Healthy Homes. Every private rental has had to comply since 1 July 2025, with penalties of up to $7,200 [9]. That 1974 brick-and-tile will likely need insulation, heating or ventilation work. Price it in before you offer.
- Unconsented flats. Check the downstairs unit is actually consented. If it isn’t, it can cause problems with lending, insurance and tenancies.
- Behind the orange carpet. Get a building inspection covering piles, roof, wiring and moisture. Ask about asbestos and meth testing.
- Thin buffers. A 1% rate rise adds about $94 a week to Dave’s loan, and markets are pricing an OCR peak around 4% [12].
- Tax policy. The general election is on 7 November. Labour proposes a 28% tax on residential investment property gains from 1 July 2027 [10], and other parties have their own proposals [11]. None of it is law yet, but it belongs in your 10 to 20 year exit maths.
Why bring a broker in before you make an offer?
Here’s the part of Dave’s story that decides whether it has a happy ending. The house is only half the deal. The other half is how a lender sees it, and that varies more than most investors expect. The biggest challenge I see is investors who lock in the property first, then try to make the lending fit.
Home and income properties are a perfect example. Lenders differ on how much of the second rent they’ll count, how they treat a consented flat compared with an unconsented one, and how hard they stress-test your repayments. Bring me in early and I’ll help you structure the loan (interest-only periods, splits, keeping securities separate), model what happens to your cashflow if rates, rents or vacancies change, and present a deal that gives the lender confidence. The more complex the property, the more that early planning is worth.
F.A.Q
Generally 30% for an existing home. Banks can lend up to 10% of new investor lending above 70% loan-to-value [6].
Not always. Presales help show demand, but in 2026 many funders focus more on the residual loan-to-value ratio and whether the finished property can be refinanced [8].
Can a rental property be cashflow positive in NZ right now?
It’s possible with more than one income stream on one title, such as a home with a self-contained flat. A standard single-tenancy house usually isn’t at current rates, based on the example above.
Do I need building consent for a granny flat?
Not if it meets the exemption: single storey, up to 70 square metres, built by licensed practitioners, with a council PIM first [8].
Dave isn’t a real client. They’re composites of situations I see regularly, and their numbers are illustrative.This article is general information only and isn’t personalised financial advice. Lending is subject to lender criteria and assessment. Talk to a licensed financial adviser about your situation. Rates and figures are as at the dates stated.
Sources (accessed 23 to 28 September 2026)
1. Trade Me Rental Price Index, June 2026, via Scoop: https://auckland.scoop.co.nz/2026/07/aotearoa-rental-market-hits-a-winter-flatline-as-national-rent-stalls/
2. Ministry of Housing and Urban Development, Housing Market Update, March Quarter 2026: https://www.hud.govt.nz/assets/Uploads/Documents/Housing-market-update/Housing-Market-Update-March-Quarter-2026.pdf
3. REINZ, August 2026 data release, via Scoop (15 Sep 2026): https://business.scoop.co.nz/2026/09/15/national-prices-steady-amid-slower-activity-and-regional-variation/
4. Reserve Bank of New Zealand, OCR increased to 2.75% (2 Sep 2026): https://www.rbnz.govt.nz/news-and-events/news/2026/09/ocr-increased-by-25-basis-points-to-2-75
5. Opes Partners, Whangārei property market (23 Sep 2026): https://www.opespartners.co.nz/property-markets/northland/whangarei
6. Reserve Bank of New Zealand, LVR timeline (updated 14 Aug 2026): https://www.rbnz.govt.nz/regulation-and-supervision/oversight-of-banks/standards-and-requirements-for-banks/macroprudential-policy/timeline-for-loan-to-value-ratio-restrictions
7. NZ Herald, Labour on interest deductibility (21 Sep 2026): https://www.nzherald.co.nz/business/personal-finance/tax/election-2026-labour-confirms-it-will-allow-residential-property-investors-to-continue-deducting-interest-as-an-expense-when-paying-tax/premium/TUBTAANQ5ZG6VPSWLNCUGS6UIE/
8. MBIE Building Performance, granny flat consent exemption (15 Jan 2026): https://www.building.govt.nz/about-building-performance/all-news-and-updates/new-update-page-5
9. Tenancy Services, healthy homes compliance: https://www.tenancy.govt.nz/healthy-homes/healthy-homes-compliance/
10. NZ Tax Tools, Labour’s proposed capital gains tax and the 7 November 2026 election: https://nztax.tools/labour-capital-gains-tax-calculator/
11. NZ Politics Promise Tracker, party tax proposals for the 2026 election: https://www.nzpoliticspromisetracker.nz/promise/labour-tax-plan-cgt-2026
12. Newswire, ANZ OCR forecast and market pricing (Sep 2026): https://newswire.co.nz/2026/09/anz-ocr-forecast-3-5-bnz-mortgage-rates-rise/
