When do you need building permission in Feltham?

In Feltham, obtaining building permission is typically required for significant alterations to your property such as house extensions, loft conversions, and garage conversions. You will need planning permission when your project exceeds specific limits, including extensions more than 3 metres beyond the rear wall for terraced houses or 4 metres for detached houses. Additionally, if you're altering the structure of your home, like changing the roofline for a loft conversion, permission is essential.

For a garage conversion, if the external appearance changes, you will also need to apply for permission. In 2026, the average cost for planning permission application fees can range from £200 to £500, depending on the complexity of your project.

Moreover, ensure that any builders or contractors you hire are certified, such as being registered with the Federation of Master Builders (FMB) or having Gas Safe and NICEIC certifications when dealing with utilities.

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