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Hallmark Developments | Granny Flats | Home Builder Perth

Updated 2026-09-05 · 3,151 reviewed · 179 listed · Scored from 11 Google reviews · How we rank ›

4.9(11) 60 low data composite score See reviews on Google ✓ Google-verified
Granny Flats & Home ExtensionsLuxury Home BuildersHome BuilderCustom Home BuildersConstruction CompanyDuplex & Multi-Unit BuildersDisplay Home & Volume BuildersBuilding Consultant
Hallmark Developments | Granny Flats | Home Builder Perth
Services
Granny Flats & Home Extensions, Luxury Home Builders, Home Builder
Reviews
11
Ranking
#16 in Granny Flats & Home Extensions
Best for
Homeowners seeking owner-managed builds or renovations with fast, transparent delivery.

Business data from Google Business Profile, checked 2026-09-05.

What reviewers think

Mark Gethin and his team deliver renovations and custom builds on fast timelines without cutting corners. Reviewers consistently report quick replies, honest communication, organised material selections, and trades they trust to do quality work. Projects come in on time and within budget, and Mark manages detail work with care-bathrooms, wall layouts, landscaping-whatever the scope.

Based on limited recent reviews, so treat this as low-confidence.

Praised for
  • responsive and communicative owner
  • fast project turnaround
  • high quality craftsmanship and trades
  • on-time and on-budget delivery
responsive-teamon-time-handoverquality-craftsmanshiptransparent-pricingvalue-for-moneyprofessional-staffattentive-supervisor
Best for: Homeowners seeking owner-managed builds or renovations with fast, transparent delivery.
Think twice if: No significant caveats arise from the reviews provided.

Strengths

  • Owner-led with hands-on communication
  • Fast project completion
  • On-time and on-budget track record
  • High-quality trades and materials

Worth knowing

  • Mark Gethin is the owner and manages projects directly
  • Team coordinates material prestart selections with external retailers
  • Manages both large renovations and final detail works (bathrooms, wall configurations)
  • Engages and supervises qualified trades and sub-contractors

What reviews say by service

Granny Flats & Home Extensions
Extensions completed on time, within budget, with careful attention to space use.
Custom Home Builders
Full custom builds delivered quickly without compromising quality or budget.
knockdown-rebuild
Rebuild projects handled with ethical communication and high-standard trades.
Construction Company
Renovation and construction work praised for fast turnaround and craftsmanship.

How it compares

  • Rated 4.9 against a 4.79 average across the 61 granny flats & home extensions businesses listed here.
  • Has more Google reviews than 49% of the businesses in this directory.

How did this business earn its score?

How We Score
Star rating 80
Review volume 47
Review recency 0
Review sentiment 65
Profile completeness 75
Verification 30

Rating breakdown

5
10
4
1
3
0
2
0
1
0

Questions people ask

Does Hallmark Developments handle full rebuilds and partial renovations?
Yes. Reviewers report both full-scope knockdown rebuilds and targeted works such as extensions, bathrooms, and wall reconfigurations-often managing multiple projects over time for the same client.
Can I select my own materials and finishes?
Yes. Mark coordinates material prestart selections with your chosen retailers and organises delivery and installation timing.
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Last updated 2026-09-05