Can I convert my garage without planning permission?

Converting an integral or attached garage into a habitable room is generally classed as permitted development, which means no planning permission is needed. You are changing the use of an existing space within the building footprint, not extending the property. However, there are exceptions. If your home is in a conservation area, is a listed building, or has had its permitted development rights removed by a planning condition, you will need to apply. If in doubt, contact your local planning authority — a lawful development certificate costs around 100 pounds and gives you written confirmation that planning permission is not required.

Even without planning permission, building regulations approval is mandatory. The conversion must meet Part L (thermal insulation), Part E (sound insulation if it adjoins another property), Part F (ventilation), and Part P (electrical work). The garage floor will need insulating and levelling — most garage floors sit lower than the house floor. You will also need to demonstrate that the front wall replacement (where the garage door was) meets structural and thermal requirements. A building control inspector will visit at key stages to sign off the work.

One thing homeowners overlook is parking. Some local authorities have conditions requiring a minimum number of off-street parking spaces. If removing the garage leaves you without adequate parking, the council could object even if planning permission is not technically required. Check your original planning consent and any conditions attached to it. Also consider your mortgage lender — some lenders want to be informed before structural changes are made. The conversion itself typically costs between 7,000 and 15,000 pounds depending on specification, making it far cheaper per square metre than an extension.