Building Regulations

Quick checklist of common home improvement projects and whether the work requires approval:

This is not an exhaustive list. For any other work you are undertaking please contact us. 

Extension to my house?

Yes, but certain porches, carports, conservatories and detached garages are exempt from Building Regulations, but remember Planning Permission may be required. Contact your Building Control Surveyor for more advice.

See further information:


Conservatories are normally exempt from building regulations for more information see our Building regulations conservatories page  

Installation of Solar PV Panels to my roof?

Yes, however if your installer is registered with a Microgeneration Competent Person Scheme such as NAPIT and ELECSA then an application to Building Control is not required. There is further information available about Solar panel installation in our home owner guide  (PDF, 45KB)

If the installer is not registered with a Competent Person Scheme then you can submit an application to MK Building Control for approval. The fee is £135.00 including VAT however this assumes the electrical work will be self certificated by your installer under Part P of the Building regulations. If this is not the case the fee will be £231.00 including VAT to allow us to check that part of the work as well.

You will need to notify us once work has commenced and we will arrange inspections with you to check the work is compliant. Assuming the work complies and after the final inspection we will be able to issue you with a Completion Certificate. This Certificate can be used to assist in the conveyancing process when selling your property.

Conversion of the loft space?

Yes, and we recommend that you seek advice from a professional before undertaking such work. LABC have useful videos on Loft Conversions

Internal alterations to my house?

Yes, if any form of structural alteration is intended. Also an application would be required if there are any proposals to alter or provide new drainage or alterations affecting means of escape.

There is an LABC video on internal alterations to the layout or structure of your home

Replace the windows in my house?

Yes, unless your installer is registered with a Competent Person Scheme e.g. FENSA and able to self certificate under the Building Regulations. However, if your building is listed or in a conservation area you should check with our as to whether Planning Permission is required.

Repair work to my house?

Generally no. However, if there are proposals to add or alter drainage then an application is necessary. Please contact us if you are in any doubt.

Re-tile my roof, refelt a flat roof and/or renew the cladding of a dormer?

Yes, changes to the Building regulations in 2006 have meant that anyone doing re-roofing has to apply for approval. For more information please see our re-roofing guidance (PDF, 4.7MB)A guide to Building regs - Reroofing (PDF, 45KB)

Alternatively you may also use a roofer who is registered with the self certification scheme.

Renovate the walls, floors and ceilings of a house?

Yes, where the area of the renovation is extensive the thermal performance of the element (wall, floor or roof) will need to be considered and potentially upgraded. Please contact us to determine whether the extent of the work will require approval.

Convert my house into flats?

Yes, and we recommend that you seek advice from a professional before undertaking such work. You can read more in our guide to converting properties 

Conversion of attached garage 

Yes, the conversion of an attached garage* into living accommodation is controlled under the Building Regulations and requires a formal application to be submitted before the work commences.

*and/or a detached garage if the internal floor area is over 30 square metres in size and/or it has sleeping accommodation in it

Technical guidance note - garage conversions (PDF, 315KB) (PDF, 315KB)

This guidance note sets out basic options for achieving compliance with the Building Regulations. If you wish to do any of the work in a different way please check with the Building Control Surveyor as to whether this would be acceptable.

Erect a detached garage?

Yes, unless it meets the following criteria;

(a) The internal floor area is less than 15sqm, or (b) The internal floor area is less than 30sqm and either the garage is situated at least 1m from all boundaries or constructed substantially from non-combustible materials.

See further information on domestic exempt buildings (PDF, 178KB).

Install or modify electrical wiring?

Yes, Since 1 January 2005, any electrical work should be carried in accordance with Part P of the Building Regulations for more details read our Electrical safety guide (PDF, 56KB). Some minor works, such as the replacement of socket outlets, are not notifiable. Any notifiable works should be carried out either by an electrician who is a member of a competent persons scheme relevant to the type of work being undertaken and therefore able to self certify the work or by submitting a Building Regulations application prior to carrying out the work. 

Read more about Competent Persons Schemes and a guide on Electrical Safety.

Insert cavity wall insulation?

Yes, however if your supplier is registered with the Cavity Wall Insulation Self Certification Scheme then an application to MK Building Control is not required.

Install or replace a boiler or hot water cylinder?

Yes. Unless your installer is registered with the appropriate Competent Person Scheme, Gas Safe. Then Gas Safe will issue you with a Compliance Certificate and notify us electronically that the work has been approved.

Building regulation standards

The exacting standards are set by government and cover all aspects of construction, from foundations, structural stability, fire safety (including means of escape in case of fire), to ventilation, energy conservation and the installation of services, such as sanitary accommodation and heating boilers. The standards also ensure the provision of adequate access into, and ease of use of buildings.

There are a number of Approved Documents provided by the Government which give guidance on methods of showing compliance. These may be purchased at Government bookshops or ordered from most major bookstores and may be viewed at the Building Control Office. Alternatively, they can be downloaded from the Planning Portal 

Further help on finding out how Building Regulations or Planning Permission affect you can be found by using the Planning Portal's 'Interactive house’ 

Last Updated: 17 July 2018