CONSTRUCTION COST The exact cost of a second storey addition depends on the size of the addition and the amount of work required to the existing house. Some clients choose to remove ground floor internal walls to create more open space, cement render or paint the existing house, renovate bathrooms or kitchens and alike. However our most typical first floor addition consists of a new master bedroom, walk-in-robe, ensuite, two other new bedrooms and a small sitting room. Extensions of this size are usually around 12x8m in size. Typically these size extensions cost between $140,000 to $150,000 for the first floor addition work. This equates to a square metre rate of $1,500/m2. Although square metre rates can very inaccurate in some cases it can give owners a rough idea of construction costs. The cost for the ground floor work would need to be added to this budget cost. To confirm this budget price owners need to first have a "draft concept" plan prepared. This plan consists of a floor plan of the extension drawn to scale with a few basic dimensions, 1 or 2 elevations and a site plan. From this draft plan we can price the construction cost exactly, price alternatives in design and inclusions and obtain verbal council development approval. We can also submit a separate price to arrange all the professional designs required to obtain council development approval. We usually recommend that the owners obtain this "concept plan" directly. This way the owners retain full rights of the design of the addition. If the builder prepares the plans the he usually owns the rights to the plans and only he can build the job and the owner cannot check his price if fair and reasonable. Please contact our office for a reference for a quality and suitable building designer in your local area.
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