New Builds: Construction Loan vs Turnkey – What First Home Buyers Need to Know

At first glance, both options result in the same outcome - a new home. But the way you pay for them, the risks involved, and the level of involvement required throughout the process differ significantly. If you're comparing the two structures, this guide highlights the lender, contract, KiwiSaver, and First Home Loan questions to check before you commit.

What Is a Construction Loan?

A construction loan is a type of home loan specifically structured to fund the building of a property in stages. This means you don't receive the full loan upfront. Instead, the bank releases money in "drawdowns" at key points of the build - typically upon completion of the foundation, framing, roof, and final handover.

Because of this staged process, construction loans are more hands-on for both the buyer and the lender. The bank will usually require regular updates, council consents, and proof of progress through invoices and potentially valuations before releasing each portion of the loan.

For more detail on how staged payments work, check out our New Build Buying Checklist in the Members Area.

What Is a Turnkey Package?

A turnkey package is where you agree to buy a completed home for a fixed price, and the builder handles the entire construction process. You typically pay a deposit under the sale and purchase or build contract, and the remaining balance is paid upon completion - when the keys are handed over to you.

With a turnkey, your main home loan is usually drawn once the property is complete and ready to move into. This can make budgeting simpler for some first home buyers, especially those who are renting while waiting for their new home to be finished, but the contract and lender criteria still matter.

Turnkey builds are increasingly common in new housing developments and are often marketed as "first home friendly" options because of the lower upfront costs and reduced stress.

Key Differences Between Construction Loans and Turnkey Contracts

Payment Timing and Structure

With a construction loan, your loan is drawn down in stages. That means you'll be paying interest on the amount that has been used - not the total loan - while the build progresses. However, this can become a burden if you're also paying rent at the same time.

In contrast, a turnkey contract usually involves a single main loan drawdown at the end, upfront pricing, and fewer progress-payment decisions during the build. This can suit buyers who need to manage their budget carefully while continuing to rent or save, provided the contract, inclusions, exclusions, and lender criteria work for them.

Risk Management and Cost Overruns

One of the biggest risks with a construction loan is that unforeseen issues - weather delays, material shortages, or council sign-off delays - can cause the budget to blow out. Even with a fixed-price building contract, you may be liable for cost increases if the scope of the build changes.

Turnkey contracts are often presented with a fixed price, but the protection depends on the contract wording, inclusions, exclusions, and any agreed variations. A fixed quote generally cannot be increased unless the buyer agrees to extra work or the scope changes, but you still need legal and lender checks before relying on that certainty.

Still, it's critical to have a solicitor review the contract carefully to ensure you understand what is and isn't included. Sometimes landscaping, fencing, or driveways are excluded from "turnkey" deals - and that can be a surprise.

Loan Approval Process

Banks typically require more documentation for construction loans. This can include detailed building contracts, building plans, council consent, progress evidence, valuation checks, and confirmation of contract works insurance. Turnkey packages may involve fewer progress-payment checks because the main loan is usually drawn at settlement, but every lender will still assess the borrower, property, contract, valuation, insurance, and settlement risk against its own criteria.

KiwiSaver and First Home Loans

For both construction and turnkey builds, you may be eligible to withdraw KiwiSaver funds to help with the deposit, subject to KiwiSaver first-home withdrawal rules and solicitor/provider timing. For the First Home Loan, Kāinga Ora says each participating lender has its own credit criteria and some participating lenders may allow you to build a new home, so the lender must confirm whether the build type fits its criteria.

With a construction loan, expect the lender to check the contract, valuation, construction costs, insurance, servicing, and any cost-overrun buffer it requires.

With a turnkey, the simpler drawdown structure may help some applications, but a First Home Loan still requires at least a 5% deposit, Kāinga Ora eligibility, and the participating lender's credit and property criteria.

For more information, read our guide on deposit options for first home buyers.

Pros and Cons: How First Home Buyers Can Compare the Options

There's no one-size-fits-all answer. The better fit depends on your financial situation, risk tolerance, lender approval, contract terms, and how involved you want to be during the build.

Talk to a mortgage adviser to see how your situation aligns with either option.

Common Pitfalls to Avoid

Whether you're choosing a construction loan or a turnkey package, here are a few legal and financial pitfalls to watch out for:

• Hidden costs: Make sure your contract is clear about what's included - driveways, fencing, window coverings, etc.
• Sunset clauses: These allow the developer to cancel the contract if the build isn't completed by a certain date - something to be cautious of in a hot market.
• Delays: Allow for potential delays - especially in construction loans where delays can mean more rent or interest costs.
• Developer reputation: Check the builder or developer track record, warranties, contract history, and independent reviews.

For more on this topic, you might also be interested in our article: How to Secure a New Build with a 5% Deposit.

Making a Confident and Informed Choice

Buying a new build is one of the most exciting paths into homeownership - but it pays to understand how different funding options can affect your budget, stress levels, and settlement timeline. A construction loan may give you more customisation, but usually requires more involvement, flexibility, and financial buffer. A turnkey package may be more straightforward, but it can limit design choices and still needs careful contract, lender, insurance, and settlement checks.

No matter which option you're leaning towards, speaking with a mortgage adviser and lawyer early can help you understand borrowing power, contract risk, KiwiSaver timing, and lender criteria before you sign. At The First Home Buyers Club, we can help you work through the questions to ask - from KiwiSaver reviews and deposit planning through to comparing home loan structures for your new build.