From Money Magazine, October 2006
Lots of factors contribute to the cost of adding a room to your home. These include the type of room, size, location, materials, level of finish, the builder and so on.
Generally the most expensive rooms to add or renovate are bathrooms and kitchens. Mike Bartlett, building cost information national manager at Reed Construction Data, says kitchen renovations can cost from around $14,000 to over $38,000, depending on the quality of fixtures and finishes. Standard bathroom renovations can range from around $11,000 to over $33,000, again depending on the quality of fixtures and finishes.
Clearly, the least expensive rooms are basically just a box walls, roof and floor with not much else built into them. This could be, say, a sunroom, an extra bedroom or a study.
Bartlett says the smallest room most people would be likely to add would be about nine square metres, while a more typical size would be around 12 square metres. Such a room would make, for most people, a perfectly acceptable extra bedroom. (Secondary bedrooms in many project homes are around 9-10 square metres.)
Bartlett says renovations and extensions normally range from about $1000 to $2500 a square metre, with second-storey additions approximately 30 percent more.
However, he says: "If you work on a rough rule of thumb of around $2000 per square metre to renovate or extend, assuming a medium level of quality, you'll be pretty close to the mark." Under this formula, a 12 square metre extra room is likely to average around $24,000, with the final price, depending on site accessibility, inclusions, materials, finishes and so on.
Bartlett notes that a growing building trend is the creation of a substantial 30-40 square metre "parent's retreat" area, usually comprising a bedroom, bathroom and study/sitting space. Working on around $2000 a square metre is realistic for such a project.
Can cost from around $14,000 to over $38,000, depending on the quality of fixtures and finishes.
Standard renovations can range from around $11,000 to over $33,000, again depending on the quality of fixtures and finishes.
Renovations and extensions normally range from about $1000 to $2500 a square metre, second-storey additions approximately 30 percent more.
For the complete story see Money Magazine's October 2006 issue. Subscribe now.