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The foundations to your house, garage or conservatory provide the solid base on which the structure rests. New home foundation costs can vary according to a range of factors, including the size of the building, the soil type, the kind of foundations you are laying and accessibility to the site itself.
In this cost guide, we break down the cost to install new foundations and include a checklist of everything you need to consider before going ahead with the job.
These figures are average costs and can be affected by a range of factors including the size of your new building, the soil conditions, type of foundations and the accessibility of the site.
The costs included are for building the new foundations, and don’t include any professional fees you may encounter.
Before we dig into the detail, laying foundations is covered by building regulations which means you will need approval from your local authority before any work can take place. Your architect and builder will usually take care of this.
You may also need to notify your neighbours if any works are adjacent to their property, as outlined in the Party Wall Act. We’ve not included the costs of an architect or any surveyors costs you may need to cover in this guide.
|New foundation installation costs||Cost per square metre|
|Trench fill foundations||£120||£150|
*These are estimated, average costs. Our prices have been researched widely online by the Checkatrade team and represent a ballpark average for your proposed project. Costs may vary by region, the scope of the project and indeed by the products you plan to use.
The cost of your new foundations is typically calculated per metre, and is affected by a variety of factors, including:
The standard depth of a foundation is approximately 1m and a width of 0.6mm. The average cost to install new foundations are:
(This is based on a width of 0.6m and includes excavation, cart away, and concrete costs)
The cost per square metre of raft and concrete slab foundations will need a building design before providing a costing because there are significant variables.
The soil your property is built on will dictate the type of foundations that are suitable to use. For the purposes of building, the Government classifies subsoil into seven types:
Your chosen tradesperson and building inspector will be aware of the type of soil your property is built upon and can provide advice before work begins.
There are four types of building foundations that may be used to underpin your home, including trench fill foundations, strip foundations, concrete slab foundations and raft foundations.
Trench filled foundations are trenches that are filled just below ground level with concrete to provide a solid base for the structure. Trench fill foundations are simple to build and less labour intensive than other methods, which compensates for the higher cost of materials.
When laying strip foundations, your builder will excavate a trench and lay a solid base of concrete. They will build up from this base in blockwork until they reach ground, when your builder can switch to laying bricks, stones or your choice of material.
Concrete slab foundations are foundations made from concrete which is either poured over the ground or laid in individual blocks. Slab foundations are cheap to lay and are very strong and hard.
Raft foundations involve a solid concrete base (or raft) made up of reinforced concrete being poured on top of the soil covering the entire area of the building. It’s used when other methods, such as strip foundations, aren’t suitable – where soil pressure is low, for example.
As part of your planning application, your architect, tradesperson, and structural engineer will be responsible for ensuring that the selected type and size of foundations meet the current guidelines for new buildings.
The building inspector will ensure that the foundations you are laying are correct for the type of building and the subsoil before you are allowed to build.
During the laying of foundations, your building inspector may visit the site to check their condition.
If you are searching for the new foundation costs for comparison or want to know the foundation cost per square metre of your new home or extension, you’ll find the UK’s biggest database of trusted tradespeople here at Checkatrade.