Whether you are in the process of crafting a new basement, converting an existing basement or excavating for a basement there is a lot of planning involved. It’s just possible that you already have an existing basement that could be extended and the headroom increased, or maybe you don’t have a basement at present. In either situation, it is possible to utilize the space beneath your home. The work and permissions required depend on what the basement is to be used for. Here is a brief outline on some of the planning formalities that may be required.


These are just a few of the critical things we take into consideration.

Well…lets start with the obvious! We have to visit your property to assess the risks involved. We take note of:

  • Ownership: Are you a freeholder or leaseholder?
  • Adjoining properties: What properties/buildings are around you?
  • Trees – some trees are protected
  • Sewers
  • Traffic constraints for equipment access
  • Water ways (Rivers, brooks, streams etc)
  • General ground conditions
  • Basic amenities: such as BT cables, underground electric cables and gas mains.

We will work out a ball park cost estimate to let you know if the basement will add a recoverable value to your property. It helps your budgeting to know how much this ‘hole’ is going to cost!
What will the basement be used for…sleeping, entertainment, storage etc?
How urgent? Basement construction is safer when built during months outside of winter, so timing matters.
We carry out an initial consultation/site visit free of charge.

If you would like to arrange for us to visit you, please fill in the contact form and we will get back to you as quickly as possible.


Planning approval is not generally required for basement construction in residential properties in almost all Local Authorities in UK, but there are a few councils in London where planning permission has been introduced especially for large basements known as mega-basements.

Provided your home is not a flat or maisonette and the basement will not have any impact on the external appearance of your house, planning permission is not required.

However we will double check the local planning requirements before we carry out a detailed design.

In all cases involving basement construction, Building Regulations apply.

The main reason is that a key feature of the creation of a basement involves significant structural work and any work of this level of complexity MUST be controlled.

Irrespective of the use for a basement, unless it is existing, Building Control is required but even if it is existing and a Change of Use is required it has to be Building Regulations compliant.

I.e you cannot just change a cellar into a bedroom without building control.

The party wall act applies if you are excavating within 3m of your neighbours foundations or if you have to use special foundations such as piling with  a depth of at most 6m.

Any terraced or semi-detached house will have to serve Party Wall notices to adjoining neighbours.

To carry out a basement construction on an existing house we usually have to underpin the existing foundations.

Underpinning is a specialist technique which involves extending the foundations of a house to a deeper depth.

It has to be carried out in a specific sequence and is a delicate process.

Most cellars are shallow and to convert them to habitable basements we generally have to underpin to achieve a decent headroom.

We use proven water/damp proofing solutions to ensure your basement is always dry and comfortable.

The Right Planning. The Right Solution. Every Time.