This client opted in for a single storey rear extension for 4 meters as his house was a detached property. We had to follow the guidelines so 3 meters was the height for a flat roof and an additional 1 meter for the sky lantern was achieved. If the property was a semi detached or terraced then the guidelines for permitted development is 3 meters. We submitted the design as a certificate of lawfulness as the home-owner wanted the paperworks which is hand for when you sell your house as the solicitors ask for all the passed paperworks. Get in contact with us if you require a full building regulation design to be submitted to the council. We will design your internal layout on how you want it free of charge, adding a new downstairs toilet or utility room for your living needs.