Hayes Homeowners - Should you extend or move? In the last 5 years the price of building materials and labour has climbed sharply, making extensions costlier than many Hayes homeowners realise. What once seemed the straightforward answer to more space now needs a fresh look, as moving can sometimes make more sense. A step-by-step guide with local costings and house price achieved per square foot has been put together to help Hayes families weigh up both options.