How to calculate the cost of whole house renovation?

Handy2025

I am planning to buy a house which requires almost the entire house renovation. Below are big items that would require renovation. Below is the floor planning diagram.

 

1. Remove the small concrete wall, in-front of the entry gate (starting of the lounge wall).
2. Lounge floor level is almost 1ft down from other area. Want to level it with other floor.
3. Reno the master bedroom ensuite, if possible increase the size as shower area is very small. Change of all the utils.
4. Complete kitchen rebuild - It has concrete wall beneath kitchen top(not sure if removing it will be good idea as it will give the flexibility to resize the cabinets and other things.)
5. Complete rebuild of shared Bathroom. 
6. Reno Laundry area
7. Remove the Bar (not concrete, just a big cabinet)
8. Entire re-Flooring with vinyl oak look
9. Repair pagola - Roof is damaged
10. Outside of the house, 1 meter concrete flooring as shown in the second picture(gray).
11. Paint the entire house
12. Repair and Repaint the roof (290m2 total built area)

Can some one please comment on high level estimates for the above? I understand the cost would vary based on type material and depends on some specifics as well. But just looking for some ball park figure. 

Thank you

EricL

Hello @Handy2025 

Welcome to the Bunnings Workshop community. It's sensational to have you join us, and thanks for sharing your question about your house renovation.

Renovating an entire house is a significant undertaking, but with a clear plan, it can be a rewarding project. To get a good sense of the costs, it’s essential to break down the renovation into manageable sections, like the list you've provided. Here's a practical approach to organize DIY quoting for the house:

Firstly, walk through each area and take detailed notes, measuring every space and noting any potential issues, like plumbing or electrical constraints, that might impact your plans. For example, removing the small concrete wall at the lounge entry (item 1) and levelling the lounge floor (item 2) could involve structural changes, so you'll need to confirm if these walls are load bearing. This is crucial for getting accurate quotes.

For the master bedroom ensuite (item 3), expanding the shower area might require plumbing modifications, which can add to the cost. It's a good idea to get a plumber to assess this upfront. Similarly, for the kitchen rebuild (item 4), removing the concrete base beneath the kitchen top could improve flexibility but might require structural adjustments, especially if it impacts load distribution or plumbing locations.

For shared bathroom renovations (item 5) and laundry updates (item 6), it's worth considering prefabricated wall panels or waterproof boards, as these can reduce tiling costs and speed up the installation.

The bar removal (item 7) should be straightforward if it’s just cabinetry, but you’ll want to check for any electrical connections before demolition. For the re-flooring with vinyl oak (item 8), measure the total square footage of the house carefully, including hallways and closets, as these often get overlooked. The pergola roof repair (item 9) might be a mix of DIY and professional work, depending on the extent of the damage. If it's just panel replacement, it could be a straightforward DIY, but structural damage might need a pro.

For the exterior concrete flooring (item 10), ensure the ground is properly compacted and sloped for drainage before pouring the concrete. Painting the entire house (item 11) can be a big job but manageable if you break it down room by room. Renting or investing in a paint sprayer can speed this up significantly. Finally, for the roof repairs and repainting (item 12), it's crucial to get a roof inspection first to check for underlying issues like rust or cracked tiles, which could impact the cost.

To form a reliable quote, get at least three quotes from different builders or trades for each major section. Some jobs, like the bar removal or painting, can be more cost-effective as DIY projects, while structural changes or plumbing should be handled by licensed professionals. Also, consider permits, especially if you're altering structural elements or plumbing. Personally, I would suggest preparing an estimated budget of not less than 100,000.   

Let me call on our experienced members @Dave-1, @Nailbag, @JoeAzza, @Remarka6le, @diy_hausdesigns, @ProjectPete, @tom_builds and @TedBear for their recommendations.

If you need further assistance, please let us know. 

Eric