Share
I don't know the diff between a cabana and a pergola, but it feels like the right word. I'd like to build a 3m x 8m outdoor semi-enclosed covered area out the back. I know the requirements as far as council goes, but what i'd love some help with is getting the cost to a bare minimum. Any ideas would be welcome.
Here are the specs: 40cm above ground level. 2.5m high at back (2.1m inside), 3m high at front 2.6m inside) 
Please help me with cheapest roofing options. I'm assuming tin of some sort.
Cheapest timber options. Pine? Recylcled wood options? Where is best to look?
Walling- cheapest and most durable for sub-tropical climate with alot of rain (ie. mould-proof) I realise walling can only be 1.4m high. The back will have this walling, and then some slats or just open above it with plants growing along the fence line.
I'd also like to know how many footings I should use, I was thinking 12 but if we can get away with less, please advise. Any help would be appreicated as currenly my dear husband thinks the idea is way too expensive and I would like to change his mind.
I'm aware of the prep for the site, with landscaping fabric and 5cm of gravel for underneath drainage and weed control.
Hi @SheriBobbins,
It's great to see you're already aware of council requirements. Before proceeding, could you confirm whether a building permit is required for this structure? If so, you may need to engage a draftsperson or engineer to prepare plans and ensure everything meets building code specifications. They can also help select materials that comply with the necessary standards.
For the roofing, tin or polycarbonate are among the most affordable waterproof options. Tin is durable and widely used for outdoor structures, while polycarbonate is a lightweight alternative that lets natural light through. You could also consider sourcing second-hand or surplus materials to keep costs down. When it comes to timber, H3-treated pine is a cost-effective and weather-resistant choice. It’s treated to withstand decay, pests, and mould, and its MGP10 grade ensures it’s structurally sound.
For the walls, fibre cement cladding is an excellent option. It’s both affordable and highly durable in sub-tropical climates, offering resistance to mould and heavy rain. You can pair this with slats or climbing plants to create a functional and visually appealing design.
As for the footings, the number required will depend on the dimensions of your bearers. Larger bearers can span greater distances, reducing the need for additional footings. To refine your plan, consider sketching out your design and specifying the timber sizes you intend to use. With that information, more specific recommendations can be provided. You might like to take a look at this helpful guide: How to understand deck span tables.
Please let me know if you have any questions.
Mitchell
