GJ Demo
The place customers go after their plumber says the part no longer exists — and they find it in two minutes.
The business has been operating for over 26 years, with a prior trading name of DJ Demo, and the same family is still running it, which explains the deep institutional knowledge reviewers mention. One reviewer notes limited variety and poor organisation, but that's a single voice against a strong pattern of satisfaction — worth keeping in mind if you're hunting something unusual, but not a structural concern. Recent reviews trend noticeably higher than earlier ones, which adds to the picture of a yard that's worth visiting before writing off a repair or renovation as too difficult.
Their work
What it's like working with them
Based on a sample of Google reviews (25 total)
What they help with
Based on what their customers hired them for
How they stack up
Context from 187 demolitions in Perth
Credentials & background
Sourced from 5 public records so you don't have to look them up yourself
About GJ Demo
Graham (and his daughter Sam) run what is essentially a demolition salvage operation — the kind of place where obscure plumbing spindles that licensed plumbers declare 'impossible to find' turn up in under two minutes. Reviewers confirm this has been operating under a prior name (DJ Demo) for well over two decades before the rebrand, meaning the parts inventory reflects generations of accumulated salvage knowledge. This is not a conventional demolition contractor taking down structures on site; the core offer is reclaimed and second-hand building materials — floorboards, guttering, doors, timber, tapware, and household fittings — sold at a fraction of retail. Sam and Graham are both flagged by name for being genuinely unhelpful in a sales sense, in the best way: multiple customers note they steer you toward the right part cheaply rather than upselling. The yard suits renovation-minded homeowners, DIYers chasing hard-to-source heritage fittings, and tradespeople who need a secondary materials run — though the single note about limited variety and organisation suggests calling ahead if you're hunting something specific.
Best for: homeowners sourcing reclaimed or hard-to-find building materials for renovations, DIYers hunting replacement fittings their plumber said couldn't be found, and anyone clearing a property who wants to drop off usable seconds rather than skip them.
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Claim This Profile — Free →Common questions about GJ Demo
What kinds of materials can I find at GJ Demo?+
Customers mention floorboards, guttering, doors, timber, tapware, and general household fittings as regular stock. The yard also carries items like hot water system components and obscure plumbing spindles that are hard to find elsewhere. Stock is salvaged from demolitions so availability varies — calling ahead if you need something specific is worth the two minutes. One reviewer flagged that organisation can be inconsistent, so visiting in person tends to yield better results than a phone enquiry for unusual parts.
Is GJ Demo suitable for a homeowner doing a DIY renovation?+
Reviews suggest it's well-suited to renovators and DIYers hunting affordable second-hand materials. Multiple customers mention coming in with a specific problem and leaving with a solution Graham recommended on the spot — including parts their own plumber said no longer existed. Pricing is frequently described as a fraction of what the same items cost new. If your renovation involves heritage fittings or you're trying to match existing materials, this yard is worth visiting before heading to a hardware chain.
Who runs GJ Demo and are they knowledgeable about building materials?+
The yard is run by Graham and his daughter Sam, both of whom are mentioned by name across multiple reviews for their hands-on helpfulness. Graham in particular is described as having deep knowledge of parts and fittings, and customers consistently note he steers them toward the right solution rather than an expensive one. The business has been operating under Graham's ownership for over 26 years (previously trading as DJ Demo), so the materials knowledge runs deep. Reviews don't suggest any formal trade qualification, but the practical salvage expertise appears to be the real drawcard.
Can I drop off unwanted building materials or seconds at GJ Demo?+
At least one reviewer explicitly mentions being able to leave your 'seconds' at the yard, suggesting they accept drop-offs of salvageable materials. This makes it a useful option if you're clearing out after a renovation rather than sending materials to landfill. Reviews don't detail any formal drop-off process or restrictions, so it's worth calling ahead to confirm what they'll accept. The yard's long history as a demolition salvage business means this is likely a core part of how they source stock.
Is parking easy at GJ Demo in Bellevue?+
One reviewer specifically flags that parking is very limited at the site. If you're planning to pick up larger items like floorboards, doors, or lengths of timber, it's worth thinking about vehicle access before you arrive. Reviews don't mention any workaround or nearby overflow parking, so calling ahead for advice on the best time to visit — or whether they can assist with loading — would be sensible. The limited parking appears to be a practical constraint rather than a dealbreaker, given the volume of positive repeat visits mentioned.