1 The cost of materials for a basic 200sf screened in porch on an existing deck in most urban areas should run between $470 and $680, with an installation cost between $296 and $345.  The total cost for a basic 200sf screened in porch will range from $766 to $1,025 or an average cost of $4.48/sf.
A same level house extension in Australia will cost approximately $60,000 to $200,000+. Adding a room or extending your living area on the ground floor are affordable ways of creating more space.Here are some key points to consider that will help you keep your renovation costs in check.enovation costs for a same level extension are roughly between $60,000 and $200,000 depending on your situation, including material, labour and project management (ready to move in). As a rough guideline, earmark around $60,000 for a one-bedroom addition to your home.
House Extension Costs Calculator. The current uncertainty in the housing market has caused an upsurge in the number of house extensions being built. Adding a bedroom to a house is an almost certain way of increasing the value of a property beyond the cost of having the work done.hatprice provide a useful cost calculator (below), or better still why not use our FREE quotation service to get an accurate cost for building an extension. With the extension cost calculator you can get a quick, free, rough estimate of at least some of the costs involved in building extra room(s) for your house.