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Domestic House Extensions 

We totally understand that your home is your most important asset and the thought of making alterations brings along with it feeling of the unknown.


Our friendly, hands on approach to home improvements here at TNM Architecture is engineered to get the maximum potential out of your home, whilst  using your project budget proactively and the end result being a successful build process for you.

We can also advise on all the other payments you may potentially require, including Structural Engineering and Local Authority fees for Planning / Building Control.


We get a few calls regarding Domestic House Extensions here at TNM Architecture. Below we have tried to answer the most common questions we get asked. 

How much does a house extension cost to Design / Build ?

Each property/ site location and client budget is unique so no project is ever the same, your requirements as a potential client may vary and most importantly your build budget will dictate what can be achieved. Our guideline fee schedule below gives typical examples.

Can we build the extension under Permitted Development Rights?


You can perform certain types of work without needing to apply for planning permission. These are called "permitted development rights". Keep in mind that the permitted development rights which apply to common projects for houses do not apply to flats, maisonettes or other buildings. There are also different rules if the property is a listed building.

You should always contact your Local Planning Authority and discuss your proposal before any work begins. They will be able to inform you of any reason why the development may not be permitted and if you need to apply for planning permission for all or part of the work.

A link to the planning portal's useful guide is below :

Home improvement projects | Planning Portal

How Long will the Planning Process take ?

Generally we work on 8 weeks from date of registering the application until a decision is made. Please be mindful that in the current Pandemic, Local Authority decision times may vary.



All general enquiries will require further individual assessment. For more details please contact our office.

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