June 8, 2024


Working out whether you can afford to build your own home is the first major step in self-building. But with so much to account for and with so many factors that might impact the price, it’s not an easy question to answer. Here are some tips to help get you started.

Before you go full steam ahead, remember that building a house is an investment. That means, all being well, you should be creating value as well as spending money.

What can I afford to build?

To answer that, you’ll first need to talk to lenders and other financial specialists to gauge the amount of funds you have available and the amount you could realistically borrow. There are many items your budget will need to cover outside of the cost of building the house itself. For example, you’ll need to account for the cost of buying the plot including any stamp duty charges. You can find out more about UK stamp duty charges visit the government Stamp Duty Land Tax advice.

It would also be wise to factor in connection costs for services like electricity, water, broadband and telephone. This will vary according to the amount of work needed.

Do your research

A good way to work out your budget is to take a walk around the homes at our Self Build Show Centre. Ask yourself, is this the type of house I want to live in? How would I personalise it to suit me and my family? Once you’ve figured out your size and style of home, you can adjust our guide costs to incorporate the personal touches.

You can browse a range of Potton homes and filter your search by design style and build cost. This should help you to get an idea about the size of home you could build for your budget.

Financing your self build

The initial cost for budgeting a self-build is purchasing a plot of land to build on. After that first outlay, you’ll need to focus on finding funds to construct the house itself. Don’t worry, it is possible to get a mortgage on a self-build that will carry you through the process. You can read more about those in our helpful self-build mortgage guide.

Managing the build

Once you know the budget you have to work with, and have a rough idea of what you’d like to build, the question is how you get it built. A popular option for self-builders is to employ a project manager who then coordinates the build for them. If you want to pursue this route, make sure to research local project managers to factor in this cost. If you choose to work with a builder or main contractor, their costs will be higher again.

Think about your location

You’ll also need to consider where you’re building, before a build budget can be finalised. For example, building a home in the south east of England, with higher living costs, is more expensive than building in the North East, as labour is generally less expensive. This is simply because the trades working on your home will generally live within an hour of your site and the price they have to pay for their own homes will reflect the prices of the local market.


Finally, don't forget to include a sensible level of contingency within your build budget. This helps you account for the complexity of your design and unforeseen costs that may arise throughout the build.

We suggest including at least a 5% contingency within your budget. Using an offsite construction method such as timber frame or SIPs can improve cost certainty as the costs are calculated based on the design and become fixed at the point – we fix our costs for 6 months from the time the order is placed. If you are borrowing money to finance the build your lender may require a higher level of contingency. As your build progresses you could decide to release contingency funds upgrade your kitchen appliances, staircase or bedroom furniture.

Guide build cost comparisons

Putting together a budget to build your home can be tricky. Every family will have their own unique set of desires and requirements that influence the cost. Until your design has been developed and you’ve decided on a route to completion, you can only work with generalities and previous examples.

To illustrate this a little, some people will want a high end, bespoke kitchen, while others will be happy with something more modestly priced based on standard components. Some view a staircase as a functional piece to move from upstairs to downstairs, whereas others see it as a spectacular statement that sets the tone when visitors arrive.

There are many factors which can affect your building cost estimate and have a significant impact on project cost. Some to consider are:

  • Site investigation, demolition, site clearance and new utilities.
  • Substructure, foundations, drains, insulation and floor slab.
  • Superstructure, external walls, internal walls, roof structure, insulation and air-tightness.
  • External finishes, roof tiles, doors and windows, wall cladding and gutters.
  • Services and fit-out, plumbing, heating, ventilation, electrics, doors and stairs.
  • Decorations, plastering, finishes, flooring, tiling, sanitary and lighting.
  • Patios, paths, driveway, planting and landscaping.
  • Site management, welfare, health and safety, scaffolding and fencing.

Please be aware that there are situations, not mentioned here, where further costs might arise due to unforeseen conditions on your site. These might include but are not limited to sloping ground, poor ground or structural conditions and contamination, all of which will be taken into account when progressing with the project.


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