New build vs existing property: pros, cons, and mortgage differences
When you start looking for your first home, you will quickly discover that the market divides into two broad categories: new build properties, built or converted within the last few years and often sold directly by developers, and existing properties, which have been lived in before and are sold by their current owners through estate agents.
The choice between the two is not simply a matter of taste. New builds and existing properties come with different financial structures, different risks, different incentives, and different mortgage considerations. Understanding the differences will help you make a decision that suits your circumstances rather than simply going with what you find first.
What is a new build property?
A new build is a property that has been recently constructed and has not previously been lived in as a home. This includes houses and flats built from scratch on new development sites, as well as conversions of existing buildings (an old factory or office converted into apartments, for example) if they are being sold for the first time as residential properties.
New builds are typically sold by developers directly or through estate agents acting on their behalf. They are often marketed off plan, meaning you reserve and purchase the property before it has been completed, based on floor plans and show homes.
The case for a new build
New builds come with several genuine advantages that are worth understanding.
Everything is brand new. A new build should, in theory, require no immediate repair or maintenance work. The boiler, the electrics, the plumbing, the roof, all new. For a first time buyer who does not want to take on a project property, this can feel like a significant relief.
Energy efficiency. Modern new builds are built to current building regulations, which means they are typically far better insulated than older properties. Lower energy bills are a real ongoing financial benefit, and the environmental credentials matter to many buyers too.
Developer incentives. Developers are often willing to offer incentives to secure sales, particularly in slower markets or toward the end of a development phase. These can include contributions toward stamp duty, free carpets and appliances, upgrades to fixtures and fittings, or part exchange schemes. These incentives can be genuinely valuable, though they are also sometimes used to maintain a headline price that is higher than the property might achieve in a more competitive market.
Government schemes. Several government initiatives, including Shared Ownership and First Homes, are available exclusively or primarily on new build properties. If one of these schemes is relevant to your situation, a new build may be the route you need to take.
Structural warranty. Most new build properties come with a ten year structural warranty, typically from the National House Building Council (NHBC) or a similar provider. This covers major structural defects for the first ten years of the property's life and provides a meaningful degree of protection.
The case against a new build
New builds also come with disadvantages that buyers do not always factor in clearly.
Premium pricing. New builds are typically priced at a premium to comparable second hand properties in the same area. Developers build this premium in to cover their costs and margins. The practical implication is that in the short term, a new build may not hold its value as well as an existing property: if you needed to sell quickly within the first year or two, you might find that the market value has fallen below what you paid.
Snagging. The building industry term for the minor defects and finishing issues that are common in new build properties is snagging. Even well built developments tend to have a list of issues: poorly fitted doors, gaps in skirting boards, minor plastering imperfections, incomplete exterior work. Most developers are contractually obliged to rectify snagging issues within the first two years, but the process of chasing them up can be time consuming and frustrating.
Leasehold complications. Many new build flats, and some new build houses, are sold on a leasehold basis. Leasehold means you own the right to occupy the property for the length of the lease rather than owning the land outright. In recent years there has been significant controversy around ground rent charges, escalating service charges, and the difficulty of extending or purchasing freehold on leasehold new builds. The government has legislated to address some of the worst practices, but leasehold new builds still require careful scrutiny of the lease terms before you commit.
Off plan risk. If you are buying off plan, you are making a significant financial commitment based on floor plans, show homes, and a developer's promises. Delays are common: developers regularly push back completion dates, sometimes by months. The property may look or feel different from what you expected. And in extreme cases, if the developer runs into financial difficulties, the development may not be completed at all. Reservation deposits are typically protected, but the disruption can be significant.
Development atmosphere. Moving into a new development where many properties are still under construction (with building noise, dust, and incomplete landscaping and shared spaces) is less pleasant than the show home suggested it would be. This typically resolves over time, but the early months in a new development can feel quite different from the finished vision.
Buying an existing property
An existing property, any home that has been lived in before, comes with its own set of advantages and considerations.
What you see is largely what you get. Unlike an off plan purchase, you can walk through the actual property, look at the actual finishes, and assess the actual condition. You can see what the street looks like, what the neighbours are like (or at least their properties), and whether the area feels right.
Established neighbourhoods. Existing properties sit in established streets and communities. The local amenities, schools, transport links, and character of the area are visible and verifiable rather than speculative.
Potential for improvement. Many buyers see the scope to improve an existing property as an advantage: the opportunity to add value through renovation, extension, or modernisation, creating a home that suits them while building equity.
More negotiating room. Sellers of existing properties are typically motivated individuals (often buying their next home at the same time), which means there is usually genuine room to negotiate on price, particularly if the property needs work or has been on the market for some time.
The main disadvantage of existing properties is the potential for hidden costs. Older properties may have issues that are not immediately apparent: ageing electrics, outdated plumbing, poor insulation, roof problems, or structural movement. A thorough survey before you commit is essential.
How mortgages differ between new build and existing properties
This is an area that surprises many first time buyers, and it is worth understanding before you start your search.
Lenders treat new build properties differently from existing ones in several ways.
Loan to value restrictions. Many lenders apply lower maximum LTV limits to new builds. While you might be able to get a 95% mortgage on an existing property, some lenders cap new build mortgages at 85% or 90% LTV. This means you may need a larger deposit to buy a new build than an equivalent existing property.
Valuation risk. Because new builds are often priced at a premium, lenders are conscious of the risk that a valuation may come in below the purchase price. If the lender's valuation is lower than the price you have agreed with the developer, the lender will base the mortgage on the lower figure, leaving you to make up the gap. This is called a down valuation and it can be a significant problem in premium new build markets.
Developer incentives and the mortgage. Lenders are required to be informed of any incentives offered by a developer. If you are receiving a 5% deposit contribution from a developer, for example, the lender will factor this into their assessment and may adjust the mortgage offer accordingly. Trying to conceal developer incentives from a lender is mortgage fraud, always be transparent.
Completion timing. If you are buying off plan, your mortgage offer has an expiry date. If the development is delayed and your offer expires before the property is ready, you will need to reapply, at whatever rate is current at that time, which may be higher or lower than what you originally agreed. This is a genuine financial risk with off plan purchases.
The short version
New builds offer modern, energy efficient homes with developer incentives and structural warranties, but often come at a premium price, with snagging risks and potential leasehold complications. Mortgages on new builds can require larger deposits and carry additional lender restrictions.
Existing properties offer transparency, established neighbourhoods, and more room to negotiate, but require a survey to identify any hidden issues.
Neither is universally better. The right choice depends on your priorities, your budget, and your appetite for the different types of risk involved. A mortgage adviser can help you understand the lending landscape for whichever route you are considering and find the most appropriate product for your situation.
This article is for informational purposes only and does not constitute financial advice. Always speak to a qualified mortgage adviser before making decisions about borrowing.