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Frequently Asked Questions

Extending your house can be a daunting task, but it does not have to be. We are here to provide end to end services from idea inception to the planning application to building regulation drawings and ultimately finding a good builder. We even help with project management services.

We are asked many questions that revolve around the same themes, so we decided to put the most frequent ones on our website below.

House extension has two phases in general: A Planning Application Phase and a Building Regulation Phase. Both these phases are taken care of by us once we are commissioned to work so you will not have to worry about the process.

Planning Application Phase
  • Hiring an Architect
  • Full Measurement of the house
  • Creating Existing and Planning
    Drawings
  • Submission of the Planning
    Drawings to the Council
Building Regulation Phase
  • Building Regulation Drawings
  • Structural Calculations
  • Getting Builder Quotes
  • Starting Work

From the time we take the measurements, we aim to produce the first draft for your pursual within 2-3 weeks. We then aim to discuss and finalise with you as soon as you are happy with the final design, we submit the application to the council.

These days we recommend that you give yourself a room of 10-16 weeks from the time of submission of the applications as most councils have a backlog to work through.

You should consider the following fees:

  • Architect Fee
  • Structural Engineer Fee
  • Council Application Fee
  • Council Building Control Fee

You should consider the following fees:

Many clients ask this question upfront on a call. However, there is no straightforward answer to this. There is a 50-page document on gov.uk which goes through various rules (which themselves are not
exhaustive). Please have a look here for details.

Most clients assume that if the extension is small, it should be under Permitted Development. But that is a wrong assumption. This depends on a number of factors as given on the link above and also on features such as:

  • Front or Back extension
  • How much portion of the garden is being eaten
  • How far is the new extension from the boundary?
  • Overlooking neighbours or not
  • How much of the volume under the new roof is vs the existing roof
  • Extension size relative to the original house and NOT from the previously extended house
  • Any Article 4 restriction on your house or area or street (check with your local council)
  • Many more rules (check here for reference

As in the point 5, above, there are many conditions for the loft to be within the permitted development. You could look here for details inside the section of ‘Additions to Roof’.

As in the point 5, above, there are many conditions for the single storey rear extension to be within the permitted development. You could look here for details inside the section of ‘Class A’.

A full planning application usually remains valid up to 3 years from the time of the decision.

If the development has not been started significantly, the certificate for lawful development remains valid up until any change of planning policy.  It may not remain valid if you have had other extensions or alterations done to the house or if the roof has been changed or if your area has the land has been classified as a conservation area or if your area or street or house has any new Article 4 directions.

If you are building under permitted development and want to obtain a lawful development certificate from the council, we will still need to submit the drawings and an application. It will just be called permitted development application.

Yes, you can but if it is a design change, you will have to submit an amendment application to the council. We do that as part of the process if required.

Building Regulation drawings show Foundational details, Roof Details, Detailed Plans and Elevations, Detailed Sectional elevations and Steel beam layout (after the structural engineer is appointed) in accordance with the Building Regulations.

Once Planning has been approved by the council, detailed drawings are needed for the builder (or for the pre-approval for the council) to adhere to the Building Control standards.  In projects that do not require planning(such as internal changes / conversions that require structural changes). Building regulation drawings will also be required.

Building Control approval by the council is an absolute necessity for a legal building works. We can submit the Building Regulation drawings to the council for pre-approval. Alternatively, your chosen builder can use our Building Regulation drawings to build and during the building process, they can use Building Notice to the council to get approval during the stages of the build process. Remember that if you went with the second route via the Building Notice, it is still is ultimately your responsibility to have the building control certificate in place.

Getting an idea of costs before the design is a tough ask because a lot of elements go into it: Doors, types and sizes of windows, material used for extension (brick or timber or concrete slab or mix of these) and so on. We can give you a rough idea of costs of the extension from experience, which we do during our design phase. We also recommend options for materials to decrease your build budget while creating the design, so you have an idea of what is more or less expensive to go with.  However, an exact quote from an actual builder can only be obtained after having the detailed Building Regulation Drawings in place.

In some cases, we find that clients have built an extension unlawfully and without the required planning permission. The council would ask them to apply for a retrospective planning application. Usually this is possible (if the build satisfies the application requirements in place). We handle many such applications. If you have got a letter from your local council about such a case, please contact us and we may be able to help.

Please refer to the point 13 above regarding ‘retrospective planning permission’.

Please refer to the point 13 above regarding ‘retrospective planning permission’.

This question is more common than you would think. Many house extensions get built by builders without Building Notice and getting approved by the council. This leaves houseowners at risk. Usually this can be solved by having a building inspector from the council come around (booked by the council and paid for) to look and advise. Sometimes, they might ask for the Building Regulation drawings to be submitted to them for the build. We can help with this. However, there can be a slight chance that the extension was not built according to the building standards and may not pass the regulations.

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