Michal Banas
Few factors to consider. If you are looking to add small bedroom or another bathroom/toilet - it is always worth to spend some money. If that will be extending kitchen or dining room - it is your call. Around £1,300 per sq meter, depending on desired finish and details. But as Gary pointed out with extension so small it is most likely price will go up. In the future if you want to sell your home extra bedroom always gets you better price, bigger dining/living not necessarily will. Size of your extension is too small for bedroom so i assume it will be creating bigger kitchen / dining or living room. Maybe worth looking at bit bigger area, say another 3 feet?
