Of course some additions to your home could be seen as just impractical. Ponds, water features and pools may add an air of luxury, but they are expensive to maintain and, for families with young children, they are potentially dangerous.
And while an attractive, functional kitchen is important when it comes to the saleability of a property, the bathroom is becoming a crucial factor in attracting a good price.
"Gone are the days when one family bathroom was sufficient" says Head of Savills South West London, Robin Chatwin.
"It’s not uncommon to see clever bathroom additions now, whether it’s a free-standing bath in a bedroom or a snug wet room, in some cases sacrificing a small bedroom. We estimate that a good en suite could add between 3% and 5% to a London home valued around £1.5 million. That equates to between £45,000 and £75,000."