Not having a masterplan: Short-term thinking will come back to haunt you in a few years when you realise that the near-new kitchen or bathroom is in exactly the wrong location to suit a well-planned, well-functioning family home.
Not considering sustainable design: Panoramic views of the garden are lovely, but if the windows face west they need to be considered carefully to avoid the property becoming a hothouse.
Failing to obtain permits: Most renovations will need at least one permit prior to construction. Apart from being illegal, building without getting them can be a recipe for disaster when the time comes to sell.
Renovating without an eye to resale: A darkroom, a home theatre or a sound-proofed music room might sound great to you, but they may not appeal to anyone else when you list your home for sale. The classic? Converting the second bedroom of a three-bedroom home into a lavish en-suite and dressing room. Sounds lovely and looks great, but a house with two bedrooms and two bathrooms won’t suit many buyers.