How much does it cost to build a house? As you can imagine, it's not a question with a one-line answer. Of course, it depends on factors such as the size of the house, for example, but you might be surprised at just how many variables play into the overall cost of a self build.
Being able to estimate how much it costs to build a house is an important step of your self build journey however, as you'll need a ballpark figure in order to set a budget for your project.
In our guides to self build costs, you'll find a break down of the different elements of a build (as standard per square metre, which relates to the whole floor area, not the facing areas unless otherwise stated), how the different options for materials, management and more will affect your spend and our top tips on where to save on your budget.
Use this guide, along with our build cost calculator, and you should be well on your way to creating an accurate estimate for your build project.
How Much Should I Spend on Building a House?
Of course, the real answer to how much does it cost to build a house is that it depends on how much you have to spend. Determining this is a case of looking at the following:
- your savings
- equity from the sale of your current home
- plus any funds available via a self build mortgage
Once you have your overall figure of funds available, you'll need to account for the cost of a plot, unless you already own one. Take a look at the price of land in your area and set aside a sum for the cost of buying a site plus legal fees and Stamp Duty. You can visit hmrc.gov.uk for the latest SDLT rates.
You can also get a good idea of plot prices by visiting plotfinder.net — the UK’s largest database of small development sites.
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The remaining balance after your plot and fees is your build budget, but before you get carried away, now's the time to set 10 to 15% of it aside as a contingency fund should unforeseen issues arise, or to pay architect's fees which tend to be 5 to 6% of the overall build cost.
How Should I Split my Budget When Building a House?
Keep budgeting throughout the project to keep costs under control and make sure you have a contingency budget of at least 10% too. Also, try not to change your mind during the project as this will cost both time and money. Any savings you make should be added to the contingency fund or used for finishing touches once the majority of the build is complete.
The two largest slices of the pie, as demonstrated in this pie chart, are the cost of your build's superstructure and foundations and floor structure. The superstructure includes the walling, external cladding and the roofing, and will typical account for 25 to 30% of the overall budget. The cost of the superstructure will vary depending on the size and construction system used.
Aside from these two expenses, the rest of your build tends to account for between 5 and 10% of the total cost. The trick with balancing your budget it to understand that some individual elements can be reduced in price later down the line if earlier elements go over the initial budget.
How Much Will my Construction System Cost?
The load-bearing structural walls of a house typically represent around 13–15% of the total build cost (£30,000) based on using concrete blockwork for the external walls and ground floor partitions, with timber partitions on the first floor.
The cost of switching to a different construction system, such as an ecological timber frame with 140mm studs width, is surprisingly small across the whole house. Even if the frame costs 10% more than using blockwork, the overall impact on the cost of the house is only 10% of 15% — around 1.5% (£3,000) in total.
The same applies to switching to structural insulated panels (SIPs) or insulated concrete formwork (ICF), which manufacturers claim to be between 5–20% more expensive than blockwork. That adds 1–3% (£6,000) to overall construction costs, but brings benefits in terms of faster build speed and superior levels of airtightness.
Building using oak frame construction is perhaps as much as 40–50% more expensive than using blockwork. Overall this is likely to add 6–7% (£15,000) to total construction costs.
Service Connections Costs
If your plot is not connected to mains services, allow £10,000 for connection to water, sewers, electricity, telephone and gas. If the site does not have access to mains gas, you will need to budget an extra £2,000–£2,500 — more for renewables.
If there is no mains sewer, you will need to budget for an off-mains alternative (in place of a mains drainage connection, for which you can deduct £2,500).
As a budget figure, allow £2,500–£3,500 for a small family and £3,500-£5,500 for a larger household.
If the site is a replacement dwelling, you may save the cost of some or all service connections, but will need to set aside a similar sum for demolition and site clearance.
How Much Will the Foundations Cost?
Foundation costs per m² are likely to be more or less the same whatever you build, no matter the size or quality specified.
However, foundations are the one aspect of self build that you cannot really predict until your start digging as the soil type may dictate the type of foundation you need. Unlike most other elements of a self build, you don't get to choose the type of foundations used, as the local authority Building Control surveyor (or licenced inspector) will ultimately decide the foundation system for your site.
If they decide that an engineered foundation solution such as a raft, piles and reinforced ringbeam, or a reinforced slab, is required, this could add as much as £10,000 to your foundation costs.
Other variables that may affect your foundation costs include:
- Proximity of your site to the nearest ready-mix concrete plant
- Proximity of the nearest tip for removing spoil (known as muck away)
- The gradient of the ground you're building on
Building on a sloping site will also increase costs due to the work involved in cutting and filling the site to create level terraces, landscaping work to create retaining walls for drives and paths, and the additional cost of complicated designs.
As a general rule, each 5° of slope from level on the site will increase your build costs by £5,000.
(MORE: Foundations for Difficult Sites)
What Can I Expect to Pay for Exterior Finishes?
This will depend on your material of choice.
How Much Does It Cost to Build a House with Brick?
Brick typically represents around 5% (£11,000) of the cost of building a house based on stock bricks costing £350/1,000.
Upgrading to character bricks at £850–£950/1,000 can more than double the cost of this element (to £20,460) by the time additional labour is taken into account to lay the irregular-shaped bricks. This is especially true if they are laid in a traditional bond such as Flemish.
Additional costs can be incurred with detailing, such as brick arches.
How Much Does It Cost to Build a House with Natural Stone?
Natural stone is a more expensive choice than stock bricks. Using cropped coursed stone blocks to form an independent outer leaf of a cavity wall (with a blockwork or timber frame inner leaf) works out at a very similar cost to handmade brick.
Using reconstituted stone costs much the same for labour, but slightly reduces materials costs.
Building using traditional random stonework is slower and although the materials cost is similar, the labour cost is higher, making it more expensive. The most cost-effective option is using them at a depth of 250mm against full-fill cavity insulation and waterproofed blockwork (if acceptable to Building Control in your area).
Building against a backing block to form a cavity, with an inner leaf of blockwork or timber frame, will add around £20/m².
How Much Does it Cost to Build a House with a Rendered Finish?
Sand and cement render on blockwork is one of the cheapest options, especially if it is self-coloured using white cement and local sand, so it does not require painting (which typically costs around £10/m² or £2,200).
Adding lime will make the render more forgiving but will marginally increase costs. Modern polymer renders are more flexible but add more to materials costs.
How Much Does it Cost to Build a House with Cladding?
Painted softwood shiplap can prove a cost-effective choice, especially on a timber frame structure, where no backing block is required. Dense timbers such as oak, western red cedar and sweet chestnut, and also heat-treated softwood such as larch, are good choices and comparable in cost to using a good-quality brick.
(MORE: Cladding a House)
How Much Will Your Roof Cost?
Roof costs are made up of:
- the structure
- felt and battens
- roof covering
The cheapest option is to build a simple rectangular-format low-pitched roof using manufactured trusses.
The low pitch means the rafter lengths are shorter, using less timber, and the manufactured trusses use a web of thinner timbers, again reducing materials costs.
The more complex the roof shape, the more likely it will have to be cut on site, using more labour and timber than factory-made trusses. This will add to costs and take longer to construct.
It will also require an engineer to check the design and produce calculations for Building Regulations purposes for a fee that would otherwise be covered by the truss manufacturer. More complex roof designs may also require structural steelwork.
The steeper the roof gets, the more expensive the roof will be to construct. As a rule of thumb, increasing the roof pitch by 5% will double the cost of the roof, while increasing it by 10% will triple it.
Developers favour large-format, interlocking concrete roof tiles with a coverage as low as 8–10 tiles/m², keeping labour and materials costs down. Most self builders choose more attractive, smaller-format tiles made from natural materials such as clay or slate. Unfortunately, smaller tile formats will increase labour and material costs.
If you plan to use a roofing material other than that allowed for in the average costs (£20/m² Standard, £40/m² Good, £80/m² Excellent) you need to add an allowance for the net difference in cost. If you decide to go for decorative details to the ridges or verges, or to use very irregular handmade tiles, this will add to the cost of labour and materials.
How Much Will the Floor Structure Cost?
Concrete slab, suspended timber or beam and block? All are viable choices for your ground floor structure.
The standard specification for first floors is to use softwood joists covered with flooring grade chipboard; the cost of which is £16–£19/m² (approximately £3,200–3,800).
Using engineered joists such as I-beams or beams with a steel web such as Posi-joist will add to your costs by £2–£3/m² (£400–£600), but the more regular dimensions and improved stability can help avoid squeaky floors.
If you are building a masonry or concrete (ICF) house, you could opt for a concrete first floor structure, using either pre-stressed concrete beams infilled with concrete blocks or large-format concrete floor panels.
This offers superb strength and acoustic separation, and allows you to have masonry first floor walls throughout. This specification will add to your costs by £8–£12/m² (£800-£1,200).
Estimated Costs for Walls and Ceilings
There is little cost difference between blockwork and timber frame internal partition walls.
Developers looking to keep down costs work with a standard ceiling height of 2.4m. Changing the ceiling height adjusts the average cost/m² for that storey by approximately 1.6% for each extra 100mm (meaning a 2.7m ceiling height on the ground floor adds £4,800 to the total costs).
Following industry standards allows you to use industry standard sized materials such as plasterboard on your walls.
Costs are similar for both wall finish options (wet plaster or dry-lined). The standard specification assumes emulsion paint throughout, with minimal tiling to kitchen and bathrooms at £64/m² (£14,080).
The good specification includes more tiling in the kitchen and bathrooms and wallpaper in the living room at £80/m² (£17,600). The excellent specification also includes wallpaper to the bedrooms at £96/m² (£21,200).
Ceilings are usually covered with plasterboard and finished with a two-coat skim of fine gypsum plaster and emulsion paint at £17–£20/m² (£3,700). If you decide to add decorative coving, ceiling roses or other decorative plasterwork, you will need to allow for extra.
How Much Will My Staircase Cost?
The main staircase is an opportunity to add individuality to a property and to make an architectural statement. If this is your plan, make an additional allowance for this above the staircase allowance included in these build costs.
The standard specification solution is a softwood staircase consisting of two straight flights linked by a half-landing, with a softwood balustrade, painted or stained, at a cost of around £1,250.
The good specification includes a single straight flight in painted softwood at around £1,500, while the excellent specification allows for a straight flight in hardwood, with hardwood balustrade at around £2,150. Obviously this is removed from your total build cost if you’re building a bungalow.
(MORE: Staircase Design Guide)
How Much Does a Chimney Cost?
Many modern houses do not include a chimney — especially those built by speculative developers, largely because of the cost, which starts at £6,100 for a standard specification. Many modern houses also forgo a traditional open flue chimney in favour of a log burning stove and stainless steel flue, at an installed cost of around £1,650–£2,500.
The standard specification has an allowance of £6,600 for the fireplace and flue; the good specification has an allowance of £8,300, and the excellent £11,300.
How Much Will my Windows and Doors Cost?
External joinery is another feature that self builders place a great deal of value on, and consequently tend to invest in quite heavily.
- The standard specification house has off-the-shelf painted softwood casement windows and external doors, with double-glazed units and factory-fitted aluminium ironmongery at a cost of £60–86/m² (£13–£19,000)
- The good specification includes high-performance, off-the-shelf painted softwood casement windows and external doors at £81–£107/m² (£17–£23,500)
- The excellent specification includes double-glazed aluminium frames in hardwood surrounds and a hardwood panelled front door and good-quality ironmongery at £121–£146/m² (£26–£32,000)
If you want to go for bespoke windows, get a quote from a joinery supplier and substitute their price for the allowance/m² (joinery allowance for your chosen specification multiplied by your gross internal floor area).
This is another area where many self builders choose to make an upgrade from a standard specification.
- The standard specification includes hardboard-faced hollow-core flush doors in softwood frames, hung and decorated at around £250 per door (£4,000 based on 16 doors) including all ironmongery
- The good specification includes slightly better hollow-core flush doors in softwood frames, hung and decorated at around £350 each (£5,600)
- The excellent specification includes hardwood veneered solid-core doors in softwood frames, hung and decorated with quality ironmongery at around £450 each (£7,200)
If you plan to put in more expensive doors, you will need to account for this in the total build cost.
How Much Will a New Kitchen Cost?
The cost of a new kitchen will depend on the quality and style, ranging from budget, off-the-shelf kitchens to designer bespoke kitchens.
How Much Will a New Bathroom Cost?
Plumbing costs are much the same regardless of the specification you choose, but the cost of sanitaryware and brassware varies enormously. The quality and area of tiling on the floor and walls varies from £23/m² upwards, and then you can add showers and enclosures, heated towel rails, underfloor heating, luxury baths and more.
The costs in the tables allow for two bathrooms and one cloakroom at the relevant cost. If you plan to fit more bathroom facilities, or better quality facilities, then use the typical cost allowances below to allow for this in your overall build cost.
(MORE: Bathroom Design Guide)
|Bathroom (WC, basin, bath and additional plumbing, doors, walls, windows and finishes)||Shower Room (WC, basin, shower cubicle, doors, walls, windows and finishes)||Cloakroom (WC, basin and additional plumbing, doors, walls, windows and finishes)|
Working out the Cost of Fixtures, Finishes and Utilities
This section covers:
- Built-in cupboards
How Much Will Flooring Cost?
|100% wool carpet||£45–55/m²|
|Laminate (wood effect)||£20–25/m²|
|Engineered oak flooring||£60–65/m²|
|Reclaimed pine floorboards||£40–50/m²|
|Natural stone flags||£70–80/m²|
How Much Does Built-In Storage Cost?
Built-in wardrobes and storage areas are already allowed for within the costs at roughly £20/m², £30/m² and £40/m² for standard, good and excellent specifications.
How Much Does a Heating System Cost?
A standard heating solution is a radiator system with a gas boiler and basic controls. A standard central heating system will cost £18–£23/m² (£4,000–£5,000) and this is the allowance in the average build costs.
Underfloor heating is typically more expensive, so allow £30–40/m² (£6,600–£8,800). If you want renewables, add this in to your budget accordingly. The standard costs allow for the inclusion of a mechanical whole-house ventilation system with heat recovery, around £1,600 for houses under 150m² and £2,100 for larger houses.
How Much Will the Electrics Cost?
Standard costs do not vary much from house to house other than by scale. If you decide to fit anything out of the ordinary (e.g. a whole-house structured cabling network), you will need to make an allowance for these upgrades.
|Low voltage down lights (7)||£350–400|
|Structured cable network||£200–250|
|Separately switched 2a lamp circuits||£250–350|
|Security alarm system||£600–1,500+|
- Legal Fees: £500-1,000
- Stamp Duty and Land Tax: Until 30 June 2021, the first £500,000 of all property sales is exempt from stamp duty
- Topographical Site Survey: Typical cost £350-500
- Design Fees: Architects charge 7-15% of the total build cost for a service involving design and supervision. For planning drawings from other sources expect to pay from £2,500-£3,500, plus a similar figure for Building Regulations drawings
- Structural Engineers’ Fees: £400-£500
- Planning Application Fees: £462
- Building Regulations Fees: £500-£1,000
- Warranty: Around 1% of contract value
- Self Build Insurance: Typically 1% of the projected build costs
- Services: Typically £3,500-£6,000 total
- Demolition Costs: Typically £5,000-£10,000
- External Works: Around 15% of total build cost
- Preliminaries: such as setting up a site office, scaffolding, fencing, security and safety equipment and skips. Typically costs £5,000-12,000 for a new house.
What Factors Affect Build Cost?
The bigger the house, the more it will cost to build, but there can be some economies of scale that reduce the average cost/m² for larger houses, making a carefully-designed large house better value.
The savings are mainly in the cost of building the superstructure, especially the foundations, walls and roof. The cost/m² of gross floor area for external walling elements decreases as the wall/floor ratio decreases.
Other one-off unit costs for items such as service connections, staircase, kitchen and boiler are spread out further on a larger house. To maximise efficiency, the design needs to be kept simple and avoid unusually large spans for floor joists/beams, rafters etc.
If you want to get the maximum development return on a site, it often pays to build as many storeys as possible.
The specification and cost for a set footprint and roof layout will not vary whether the design is single storey, two storey, or three storey, yet the overall area of the design will increase dramatically — spreading out the cost.
Multiple storeys also make better use of land, which is the most expensive element of all.
The cost of constructing a basement largely depends on the digging out and removing of spoil. This cost – and the cost of waterproofing the structure – is mitigated to some extent by the fact that fewer windows are usually used than for above-ground storeys, and there is no external wall cladding (e.g. brick or stone).
As ever, the quality of fixtures and fittings will be a major factor in the final cost. For the purposes of producing a budget figure for your basement, measure the gross internal floor area and use the same costs/m² as for above-ground space.
How Your Own Involvement Affects Build Costs
In order to get a building site to run smoothly, someone has to manage the processes. They have to ensure that the right people are hired in the right order and that the correct materials are on site as and when needed, as well as checking that the work is carried out properly and that the site is left clean and safe everyday.
The average build costs are based on the cost of using a main contractor to manage the whole build.
- co-ordinate the trades, materials, plant, tools and scaffold
- liaise with the architectural designer
- co-ordinate the statutory inspections for Building Regulations and warranty
- take legal responsibility for the site.
If you take on this role by hiring subcontract labour directly, providing materials and facilities as required, you can reduce the build cost by 10-15% depending on how efficiently you manage the project.
(MORE: Self Build Project Management)
Approximately 35% of the total cost of building a house is labour, so if you decide to substitute some or all of the labour costs with your own DIY labour, you can reduce the average build cost substantially.
You can undertake almost every aspect of the building work if you have the time and skill to complete it competently, except for connecting gas appliances.
Trades more easily undertaken by the DIY self builder include:
- fitting insulation
- roof tiling
- general labouring
- assisting plumbers and electricians on second fix
- floor laying
Typical savings for a DIY self builder doing roughly 25-30% of all the work amount to 20-25% of the total cost compared to using a contractor.
On larger projects, a professional is usually retained to put the project out to tender, appoint the contractor and administer the contract through to completion.
The fee for this is typically 3-5% of the total contract value (construction cost). If you take on this role yourself you can save this fee (which isn’t included in our base figures).
How Your Specification Affects Build Cost
Although the cost of many of the construction elements such as the foundations do not vary based on quality, the cost of external facings, joinery, flooring, fittings – and renewables – can potentially double the cost of building the same house compared to a standard specification.
Michael is HB&R’s Head of Content and Product Development. Michael is also, Chair of the National Custom and Self Build Association (NaCSBA), presenter of multiple property TV shows and author of Renovating for Profit (Ebury). Michael is a regular in the seminar theatres and Advice Centre at the Homebuilding & Renovating Show.
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