Hi Lindel Love the design and view! There are a couple of solutions here, depending on what the requirements are (ie cost versus energy efficiency). To your original query, the Colorbond will give a better maintenance long term but obviously the energy efficiency is zilch. The structure behind needs to do the insulation work as well as be structural. From a cost point of view timber framing is cheaper but the wall insulation is limited. You can however use a structural insulated panel to be both the structure as well as the insulation for everything from the upper floor to the walls and roof.... We are doing an extension in this at present which will actually look like a 1930's character style to match the existing home. I'm not familiar with your BAL but we have found that when we get such high insulation ratings from the walls and roof it has usually enabled us to cover the losses from windows and given the ability to have larger windows without the need for double glazing. Regarding the timber, I would be considering an artificial product unless you want to do the maintenance. Cheers

Lovely story attached to this house MB Design cheers This 1960s house in suburban Melbourne has been overhauled by Branch Studio Architects to create a contemporary home for the original owners' granddaughter (+ slideshow). The local firm was tasked with revamping the dream home of a pair of Jewish refugees – one a survivor of the Auschwitz concentration camp – who had arrived in Australia with little more than the clothes on their backs. The couple had built the house as soon as they could afford to, and lived in it for the rest of their lives. After they both died, it was passed down to their granddaughter Danielle and her husband Adam, who works as a writer – hence the project name, Writer's House. The brief given to Branch Studio co-founder Brad Wray was to restore the house to its former glory without turning it into a "mid-century mausoleum". "It was our joint intention that whatever new works we did to the house would not impact on the original integrity of the original house and it memories," explained Wray. "There is often a very fine line between creating a nostalgic 'museum' of something that was and removing all notion of the existing all together," he said. Built in 1968, the two-storey house was designed by emerging designer Michael RE Feldhagen, a protégé of modernist architect Ernest Fooks. It was one of a number of International Style properties built in the Caulfield area at that time, although many have since been demolished. Respecting this, Wray's team chose to leave the building's facade largely unaltered. The only real change was the addition of steel-framed windows, to replace the original wooden ones, and a more minimal white colour scheme. A much bigger change was made at the back of the house, where a new "party deck" has been created. Flanked by perforated aluminium privacy screens, the deck extends the building further into the garden. Related story Pump House by Branch Studio Architects is a metal-clad lakeside retreat "[It] not only solved a practical issue of overlooking, but more importantly was used to extend the internal areas to create a much more flexible internal/external cohesion of space," said Wray. Inside, the house is still filled with the bespoke joinery created by Jacob Rudowsky – a popular local craftsman – shortly after the house was completed. One of the biggest challenges was designing a contemporary interior without making these restored traditional elements feel out of place. Wray took a risk by choosing to pair them with plywood surfaces and concrete floors. "The hope was that the marriage of raw and refined would be seamless and elegant," said Adam. "To this end, every room in the double-storey building was totally reimagined, but each space retained hints of the original, Easter eggs pointing to what came before," he added. Behind the deck, an assortment of living and dining spaces are organised around a generous plywood-lined foyer, which functions as a gallery for the clients to display their art collection. The kitchen features contemporary cabinets fronted by lime-washed plywood, while the living space is furnished with old sofas reupholstered in vibrant green fabric. Three bedrooms are located at the opposite end of the house, along with two bathrooms, including one that features a concrete tub and decorative grey tiling. The ground floor contains a wine and whiskey cellar, a garage and a writing studio for Adam. The building is the latest in a series of 1960s renovations, as more new owners start to appreciate the modernist style of architecture. Other recent examples include a refurbished London terrace house and a renovated Ivory Coast villa. Photography is by Peter Clarke/Latitude Group. Project credits: Architect: Branch Studio Architects Project team: 
Brad Wray, Rowena Henry, Simon Dinh Landscape architect: Plume Studio Structural engineer: Perrett Simpson Stantin Original architect: Michael RE Feldhagen Original furniture: Jakob Rudowski New dining and coffee tables: Brad Wray Workshop Rudowski sideboard restorations: Orchard Design Concrete bath and vanities: Hungry Wolf Studio

I love the stone, it reminds me of the classic Sydney Northern Beaches cottage which is often weatherboard and sandstone. If you google Avalon beach cottage you will see what I mean. I personally think the addition of natural timber is too much as an additional finish. I’d probably continue with the weatherboard. The deck you could then do in timber and let it fade to grey.

We chose Monument Tiles and Guttering with "Surfmist" Fascias and Eaves (varying strength of paint). The Pillars at front were rendered and also "Surfmist" (1/2 strength). The Garage door also Monument - focus is drawn to Pillars and Timber Beam (our home very similar to yours). If you visit the Builders showroom they can usually make these changes on computer so you can see visual of how home would look with colour choices! We have Surfmist aluminium window frames and at front of house White Plantation Shutters. Admittedly we have charcoal colored Bricks but house looks Crisp and Clean it "Pops" as they say. We installed 20 Solar Panels ( no Battery) and Electricity is going into Grid! Dearest bill was $14 and one bill we received $1.92 CREDIT). The panels are on the side of house and cannot be seen from street. Well worth the outlay! I have heated floors in bathrooms and ducted air conditioning and so far we haven't lost power when they were working in street and had cut power to houses!!