Yard 'covered in rubble' for months after retaining wall collapses

A Perth woman has been in a six-month battle with her neighbours, builders and the council to have a wall that's crumbled into their backyard pool fixed.

Justine Challender said it sounded like "an earthquake" when the limestone retaining wall between her family's Ellenbrook home and her neighbours' collapsed without warning almost six months ago.

Her backyard looks like a disaster zone, with debris from the wall scattered in and around her backyard pool.

Ms Challender has been told it could cost hundreds of thousands of dollars to fixed, but her insurance won't cover it.

That's because the wall belongs to her neighbours, who don't have insurance.

"It's their wall, which has been stipulated by several engineers and engineers reports we have – the wall was built to support the properties up the back," Ms Challender told 9News.

The local council has said the wall is not their concern as it's on private property and an investigation is currently underway into whether the builder or developer is responsible for the damage.

But until that's complete, the Challenders have been given no option but to tolerate the damage.

Engineers said in order to clear the rubble, the neighbours will have to remove their shed and pool.

Ms Challender said with those stipulations, there's been no end in sight.

Other neighbours have taken steps to protect their own property.

Scaffolding has been installed on one side, while fence-mate Jason French said he set up an exclusion zone, fearing it was a disaster waiting to happen.

"It could just as easily happen on our side any minute," Mr French said. The Challenders are meeting with lawyers next week and hope for a quick resolution.

"We're determined to get this fixed," Ms Challender said.