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Business Details
39 Years
experience
Custom Granny Flats Sydney | All Custom Granny Flats
All Custom Granny Flats is a licensed builder with over 30 years of experience in the construction industry. Founded in 1987 by Tom Diterlizzi, our business combines traditional craftsmanship with modern design expertise to deliver high-quality, custom granny flats tailored to individual client needs. We specialise in end-to-end solutions, from initial design and approvals to construction, ensuring minimal disruption and maximum value for homeowners in Sydney and the Central Coast.

Our team works closely with accredited certifiers to navigate regulatory requirements efficiently, while our commitment to using premium materials guarantees durable, low-maintenance structures. With a family legacy in building and a focus on innovation, we prioritise client satisfaction through transparent communication, attention to detail, and a dedication to transforming backyard spaces into functional, stylish living areas.
Services
Custom Granny Flat Designs Approvals Assistance Construction Services Site Assessment Solutions Maintenance-Free Builds
Details
  • Year established: 1987
Highlights and features
  • Over 30 years of experience in residential construction.
  • Custom designs tailored to individual site requirements.
  • Expertise in navigating complex site challenges.
  • Use of premium, maintenance-free building materials.
  • End-to-end project management from design to completion.
What people say
Quality of the build Attention to detail Durable and maintenance-free Professional attitude Excellent customer service
Services
Custom Granny Flat Designs
We create bespoke granny flat designs tailored to your property's unique dimensions and your lifestyle needs. Our process involves collaborative consultations to ensure functional, aesthetic, and compliant solutions. Clients benefit from designs that maximise space efficiency while maintaining structural integrity and visual appeal.
Approvals Assistance
Our team manages all aspects of the approval process, including lodging applications with accredited certifiers and ensuring compliance with NSW planning controls. We streamline bureaucratic requirements to secure approvals efficiently. Clients gain peace of mind knowing their project adheres to legal standards without unnecessary delays.
Construction Services
We deliver end-to-end construction services using premium materials and skilled tradespeople. Our process prioritises minimal disruption to your property while ensuring high-quality finishes. Clients receive durable, low-maintenance structures built to Australian standards, completed on time and within budget.
Site Assessment Solutions
We conduct detailed site assessments to address challenges like uneven terrain or restricted access. Our expertise turns complex sites into viable building opportunities through innovative engineering solutions. Clients benefit from tailored recommendations that optimise their land's potential.
Maintenance-Free Builds
Our granny flats are constructed with weather-resistant materials and robust engineering to minimise long-term maintenance. This approach reduces repair costs and extends the structure's lifespan. Clients enjoy a hassle-free living solution that retains its value and appearance over time.
People
Tom Diterlizzi
Proprietor / Builder
With over 30 years in the building industry, Tom Diterlizzi combines family trade heritage with modern design expertise. He founded All Custom Granny Flats to address growing demand for affordable, high-quality secondary dwellings in Sydney.
Questions
What is a granny flat?
A granny flat is a secondary dwelling on the same property as a primary residence, often used for rental income, family accommodation, or additional living space.
How long does construction take?
Most projects take 12-16 weeks from approval to completion, depending on site complexity and weather conditions.
Do you handle council approvals?
Yes, we manage all regulatory requirements, including lodging applications with accredited certifiers to secure necessary approvals.
Can you build on difficult sites?
Yes, we specialise in assessing and constructing on challenging sites, offering tailored solutions for uneven terrain or restricted access.
What materials do you use?
We use premium, weather-resistant materials including treated timber frames, steel roofing, and low-maintenance cladding options.
Are your granny flats energy efficient?
Yes, we incorporate energy-efficient lighting, insulation, and optional features like solar panels to reduce running costs.
Reviews (1)
Jonathan Hart
Aug 06, 2018 Report
Tom is the best in this business. His frank and direct assessment from the start is the draw card for us to turn to him for help. He really cares for his customer. Wish you all the best.