Domestic House Extensions
We help homeowners create better space, improve layouts and make the most of their property.
From first ideas through to planning, building control and technical design, TNM Architecture provides clear, practical guidance at every stage. We also help you understand likely costs, including structural engineer input and Local Authority fees, so your project starts with confidence rather than guesswork.
How Much Does a House Extension Cost?
Every home and project is different, so costs will depend on the size, complexity, specification and site conditions.
At TNM Architecture, we help you understand what may be achievable from the outset and guide you through the likely design, consultant and statutory costs, including structural engineer input, planning fees and building control.
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
Timescales
Typically, Local Authorities aim to make a decision within 8 weeks from the date your planning application is registered. However, please be aware that timescales can vary, particularly in light of ongoing pressures on council services.
Fees
Each project is unique, and we assess all general enquiries on an individual basis. For a clearer idea of costs tailored to your specific requirements, please get in touch with our office — we’ll be happy to help.
'Myself and my wife wanted to personally thank you and your team for all your help. You have helped create for us our dream home really appreciate it. We absolutely love it. Thank you.'