Flat Roof Patios in East Fremantle

In most councils a heritage property is the exception you check for. In East Fremantle it is closer to the default, and the sensible first move is to look up your own address rather than assume.

What that means for a rear patio is usually manageable. Controls concentrate on the street elevation and the form of the house, and a low roof behind the building, out of public view, is the least contentious thing you can add.

Where it gets more involved is a corner block, a property with a listed outbuilding, or a design that steps out beside the house rather than behind it. Those get looked at properly, and it is better to find that out at the sketch stage.

A weatherboard wall is a cladding, not a structure. Fixing a patio beam to it does nothing useful, because the load has to reach the studs, the plate or a new post rather than the boards.

So the detail changes. We either find and fix to the framing behind, run a bearer that transfers load to posts at the wall line, or take the whole roof off the house and stand it on its own legs a few hundred millimetres clear.

That last option solves several problems at once on these houses. No load into a hundred-year-old frame, no flashing cut into an old iron roof, and no argument about damage to fabric a heritage officer cares about.

Blocks running down toward Preston Point and the river can drop a metre or more across the length of a back yard. That is a footing question before it is a design question.

Post heights get set individually and footings are stepped down the slope, each one sized for its own depth and the load it carries. A flat roof suits this because the roof plane stays level and true while the ground underneath does whatever it likes.

Existing retaining walls complicate the setout. Digging a footing immediately behind or in front of a retaining wall can affect how that wall works, so posts get positioned clear of it or the footing is designed with the wall in mind.

Properties close to the Swan can fall within the development control area established under the state legislation covering the Swan and Canning rivers. Where that applies, a referral runs alongside the ordinary council process.

It is a timeline item rather than a refusal. Knowing on day one that the referral applies means the design and the program are built around it instead of stalling halfway through.

Low ground near the river also behaves differently in winter. Water sits longer, and the drainage layout for the new roof has to account for a wet site rather than the dry one you measured in February.

East Fremantle faces the Swan, but it is only a couple of kilometres from open water, and the same afternoon breeze that hits Fremantle comes across here too.

That puts most of the suburb in a middle band. Not the full marine environment of a beachfront address, but not the benign inland condition either, so the honest answer is that the specification is set for the property rather than the postcode.

In practice that often means upgrading fasteners and sealing cut edges properly, without paying for marine-grade sheet the site does not need. Where a house sits high on the ridge with clear exposure west, the assessment changes again.

A building permit is required before work starts, because a patio is Class 10a work under the National Construction Code. The application carries a site plan, elevations, structural engineering matched to the assessed wind classification and an on-site stormwater design.

It can be lodged uncertified for the town to assess, or certified with a certificate of design compliance from a registered building surveyor already attached.

The heritage step sits in front of all of that on a listed property, and the R-Codes questions sit alongside it. On these narrow older lots, boundary setbacks and the amount of open space left on the block are what usually decide whether development approval is needed as well.