Mosman Park House

by Robeson Architect

A home for a young family and grandmother (in the future). All areas of the home had to be wheelchair accessible, complying with the gold standard of the ‘Liveable Housing Design Guidelines’ which calls for wider hallways, doorways, and circulation space generally. This also meant the design needed to address the slope in the site, through ramps and graded paths to enable a person to transverse from front boundary to rear boundary without going up or down a step. (Note: this also makes for an easy move-in day for the furniture movers!) The program called for three bedrooms, two bathrooms, a home office, and a spacious living area. A key part of the brief was the inclusion of a ‘granny flat’, with its own ensuite and kitchenette, and a private entry. This space is to be used as a yoga studio until which stage the grandmother should move in. An off-street car bay is provided adjacent to this room, with an enclosed garage for two cars accessed from the right-of-way.

First up was resolving the need for level transitions from front to back of site. Floor levels were set, ramps created, then the floor plans grew from there. We decided not to align the bulk of the house toward the street, leaving a large backyard, but rather create smaller, distinct outdoor zones with their own distinct uses that are interspersed between the building footprint. The granny flat is located towards the street and is separated from the rest of the house with an entry courtyard. We chose to design around two established liquid amber trees, which effectively drove the angled wall to the granny flat, in order to avoid root disruption. The living ‘wing’ runs east-west and is pushed to the south opening onto a rectangular northern courtyard. To the east of this wing is a covered morning deck, which receives the eastern morning sun. This deck overlooks the largest garden, with veggies and fruit trees surrounding a grassed play area. The parent’s bedroom and retreat are the only rooms on the first-floor. The first-floor building bulk was setback a considerable distance from the street, maintaining an essentially single storey appearance of the home. Avoiding any building over the living areas allowed us to pitch the ceilings nice and high in those spaces and still meet council height requirements.

Sustainability runs through to the bones in this house, literally. Even the timber used in the wall studs and the cabinetry carcasses are ‘FSC certified’. It’s easy to forget these materials that are hidden from view, but when an owner is serious about sustainability and is prepared to invest in them it results in a greater sustainable outcome. The building is clad in recycled spotted gum, with the intention of it ‘silvering’ over time. A minimal amount of grey stain was added when sealing this timber, to promote a more even weathering (as some walls receive more sun than others). Large slimline water tanks are tucked along the south of the site, with a greywater system providing water to the garden and toilets. ‘Green’ concrete was used for the ground floor slab, which was then lightly polished to a ‘salt and pepper’ finish. Solar panels are fitted to the first-floor roof, with provision for future battery storage. There is no air-conditioning in the home, meaning louvres and windows are strategically placed to capture the cooling south-westerly breezes, together with ceiling fans to move the air around.

The ground floor walls are ‘reverse brick veneer’ construction, a wall type which is highly suited to Perth’s temperate climate. The inner wall leaf is made from grey utility bricks, with no applied finish, allowing it to contribute to the thermal mass of the home. Extensive glazing to the north of the living wing is shaded precisely to allow maximum winter sun penetration and zero summer penetration. The angled ceiling over this living wing assists further in bringing that desirable light deep into the floor plan.