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CBLS Consultants Ltd logo

CBLS Consultants Ltd

Staines-Upon-Thames, Middlesex

CBLS Consultants Ltd logo

CBLS Consultants Ltd

Staines-Upon-Thames, Middlesex



We are a multi disciplinary design consultancy offering architectural and electrical design solutions for the residential and commercial sectors. We act as the lead consultants for our clients ensuring that your project is dealt with in a professional manner and all external consultants are correctly coordinated under our management.

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Rhodri Jones

27 January 2019

We recently worked with CBLS Consultants Ltd for the extension of our property in North London. The service we received was to a very high standard, with responses to any queries delivered in a diligent and timely manner.


Providing you are not situated within a conservation area or your property is listed then a garage conversion usually is not subject to planning. But if you are unsure it is always wise to check with a professional or the planning department first. Then it is a case of reviewing the existing structure including walls, floors and roofs to determine what level of construction is required in order to meet current standards for building control acceptance. In most cases especially on garages that aren't fully integral the structure will need upgrading to meet thermal ratings. And where integral even if thermal elements are met then fire regulations should be checked once making the space habitable.

1. Check to see if your eligable under permitted development or you require planning permission. Then make necessary steps to apply for required permissions from the council
2. Obtain any technical or structural advice required to develop a package from which a builder can quote and build from.
3. Ensure any party wall notices are issued to neighbours 8 weeks prior to you starting any works.

Firstly you can check what sort of headroom you currently have within the loft space. Ideally you would have a minimum of 2500mm which will allow you to have a finished head height of 2000mm once the new structure is installed. You can lower ceilings on your first floor but this will be more costly and disruptive. Then check what permissions you require and if others have done the same in your area. If you are not within a conservation area you can extend upto 40 cubic meters if attached or 50 cubic meters if semi detached or detached under permitted development provided certain criteria are met.

1. Approach a professional to carry out a consultation if you are unsure on your possibilities prior to instructing a full set of drawings. If this comes back with a positive outcome you require detailed drawings, material specifications and a structural engineer input dependent on permissions required permitted development or planning allow 10 weeks for this process.
2. Submit a party all agreement to your adjoining neighbour, this may require a surveyor and this should be done 8 weeks prior to you starting bullding.
3. These works can be submitted under a building notice but advisable to issue as a full plans submission to building control which either your architect or builder can take care of and it is the builders responsibility to get stage approval throughout the build.

Being able to assist people in realising their design ambitions for their projects.

To be able to offer the knowledge we have gained over the years and provide a level of knowledge to an ever growing market place.

We don't just look to offer our clients a set of drawings and then to walk away and leave them to move the project forward. We are a design consultancy and look to give each of our clients the guided assistance they require to realise their project and bring it to life on site with their selected contractor.


We offer Architectural Design services for both Residential and Commercial sectors from Stages 1-7 covering early scheme design, planning and detailed construction design and site assistance