Byford sits at the foot of the Darling Scarp in the Shire of Serpentine Jarrahdale, and it has grown quickly with new estates spreading across the plain. What sets Byford apart from most Perth suburbs is the ground: instead of clean sand, many lots here have clay, and estates closer to the Scarp have more noticeable slopes. Retaining Walls Perth connects Byford homeowners with a local, insured specialist for a free quote.
Call 0485 557 649 for a free, no-obligation quote from a local, insured Perth retaining wall specialist.
Clay changes the design
One Perth landscaper lists Byford and Mundijong among the areas on the Guildford Formation, and geotechnical guidance for the Perth metropolitan area notes these clays can be moisture-reactive, ranging from slightly to highly reactive. Reactive clay swells when wet and shrinks when dry, which can move footings and push on walls. It also drains poorly, so water builds up behind a wall unless drainage is designed in. On a clay site, expect your specialist or engineer to want the site classification, and possibly a soil report, before finalising the design. The same landscaper notes concrete sleepers tend to perform better in reactive clay soils than gravity walls.
Typical Byford jobs
- Retaining new estate lots, especially those stepped up towards the Scarp
- Levelling larger semi-rural lots for sheds and driveways
- Back-yard terracing and pool retaining
- Walls with engineered drainage on poorly draining clay
Keep it on your lot
The Shire of Serpentine Jarrahdale says retaining walls shall be constructed entirely within one property and are not permitted to straddle the boundary. On a new estate, confirm your boundary pegs before the wall is set out.
Budget for the extras
Clay sites are where extras are most likely: soil reports (typically about $525 to $2,625 as of 2026, per one published Perth guide), deeper footings, more drainage and spoil disposal. See the cost guide.
Permits in Byford: Shire of Serpentine Jarrahdale
The Shire of Serpentine Jarrahdale says all retaining walls over 500 mm need a building permit, and lower walls may too if they encroach, affect adjoining land or change site drainage. Planning approval is needed where a wall over 500 mm doesn’t meet the R-Code setbacks or sits in the front setback. The R-Codes also limit fill within 1 m of a boundary to 0.5 m above natural ground unless a local development plan says otherwise, so check any estate LDP. Full detail in our WA permit guide.
What it might cost
Published Perth guides put typical installed prices as of 2026 at about $260 to $630 per lineal metre for concrete sleeper walls and about $420 to $680 per square metre of face for limestone, before drainage, engineering and permits. These are typical ranges, not quotes; see the Perth cost guide. Your Byford specialist will price your actual site.
Byford retaining wall questions
Can my Byford wall use the clay I dig out as backfill?
Usually free-draining material is specified directly behind the wall; your engineer will say what’s acceptable.
Do you cover Mundijong and Darling Downs?
Call 0485 557 649 to check coverage for your address.
Get a free Byford quote
Retaining Walls Perth is a referral service: we connect Byford homeowners with a local, insured retaining wall specialist, who quotes and contracts with you directly. Call 0485 557 649, or see other areas we serve.
Sources
- Landscapes WA, "Retaining wall cost in Perth" (12 Sep 2026)
- What's The Damage, "Retaining Wall Cost Perth 2026"
- Luke's Landscaping Co., "Limestone vs concrete retaining walls in Perth" (2026)
- The Quote Yard, "Concrete Sleeper Retaining Walls WA 2026"
- Building Regulations 2012 (WA) Sch 4 cl 2 item 6
- R-Codes Vol 1 cl 5.3.7 & Table 4 (10 Apr 2026)
- Building Act 2011 (WA) s89
- Legal Aid WA, dividing fences and boundary issues
- Shire of Serpentine Jarrahdale
- Soil context: Australian Geomechanics Society, Residential footings – Perth metropolitan area
- Luke's Landscaping Co. (24 Jul 2026), Perth soils by suburb