If your forever home plans rely on borrowing more money in the future, you need to check this before exchange – not afterwards. You also need to look at the age of the boiler, roof, windows and heating system, and so on." Forever homes rarely come cheap, but that should not be a reason to max out what you can afford. Luckily, we've sought the wisdom of expert buying agents – who are regularly tasked with finding the perfect properties for the super-rich – to find out the most common mistakes when buying a forever home and how to avoid them. But if you're buying a listed property, or it's in a conservation area, then your options can be severely restricted.