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.
If you plan to buy most of the raw materials and undertake much of the work yourself, Channel 4 estimates that a single storey (20 metre square) extension will cost Â£15,900 (or Â£795 per square metre) whilst a two storey (40 metre square) extension will cost Â£28,040 or (Â£701 per square metre).ouse extension costs vary significantly from project to project. Depending on size, complexity and location, an extension can cost anything from a few thousand pounds to a six figure sum.