Residential building design project Thornhill Park, Melbourne western suburbs

Building design and permits for Thornhill Park properties

RD Building Design is a western suburbs building designer covering Melton and neighbouring councils.

Whether you are extending, adding a secondary dwelling, or building new, RD Building Design manages the full design and permit process. We are a registered building design practice based in Melbourne's west, working across Melton.

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About RD Building Design

Rhys Davies Building Designer (DP-AD 43008) Adv.Dip. Building Design (Arch.), Registered Building Practitioner (Arch.) RD Building Design

RD Building Design is a registered building design practice specialising in residential projects across Melbourne's western suburbs. Our work covers Melton and the surrounding councils.

Every project is led by an experienced building designer from first conversation to permit approval.

For Thornhill Park homeowners: straightforward advice, honest timelines, and permit drawings done properly the first time.

Want to understand the difference between working with a building designer and an architect?

Making the most of a Thornhill Park block

Smaller lots in Thornhill Park leave less margin for error. An extension that pushes a setback, triggers overlooking, or reduces private open space beyond what the scheme allows will not get through permit.

RD Building Design resolves these trade-offs at design stage, not at permit assessment. We work on compact inner-west sites regularly and understand how the Melton Planning Scheme applies to tighter blocks.

Residential building design in Thornhill Park

Every property is different, and the right project depends on your block, your goals, and the planning controls. RD Building Design covers the full range.

Extensions. Ground floor, upper level, or both. Full ResCode compliance, structural coordination, and permit drawings.

Secondary dwellings. Granny flats, studios, and home offices. Our Boxed Buildings SIP panel kits are designed for fast assembly. We manage design and permit drawings.

Dual occupancy. Two separately titled homes on a single lot. Full feasibility and design where zoning supports it.

knockdown rebuild. Start fresh with a home designed specifically for your site and household.

New home design. For vacant land or subdivided lots. Brief to building permit.

How planning works in Thornhill Park

Every residential project in Thornhill Park is governed by the Melton Planning Scheme. What matters is not just what the scheme says, but how Melton interprets and applies it.

RD Building understand the overlays, neighbourhood character expectations, and where the controls allow room to get more from a site.

That experience translates to fewer requests for further information, faster permit decisions, and less wasted time.

Want to know what your property allows before starting? A property assessment gives you the full picture.

What you can build in Thornhill Park

Planning controls and development potential under the Melton Planning Scheme

Council

Melton

Planning scheme

Melton Planning Scheme

Predominant zones

GRZ General residential zone

Allows moderate housing growth. Dual occupancy viable on lots of 300sqm+ per resulting title. Medium density development permitted with a planning permit.

UGZ Urban growth zone

Applies to land on Melbourne's urban fringe identified for future residential development. Development is guided by precinct structure plans that set out lot sizes, density targets, and infrastructure requirements.

Planning overlays

No heritage, flood, or design overlays apply broadly to this suburb. Individual properties should still be checked for site-specific overlays.

Typical lot size

Small to medium (typically under 500sqm)

Site coverage is frequently the binding constraint. Extensions and secondary dwellings need careful positioning to stay under the 60% site coverage limit.

Granny flat viability

Permitted up to 60sqm without a planning permit under Victoria's 2023 provisions, but site coverage is likely to be the binding constraint. Many blocks can accommodate a secondary dwelling if existing building footprint allows.

Dual occupancy

Limited viability

Predominantly NRZ zoning or small lot sizes restrict dual occupancy to a small number of properties. Site-specific assessment essential.

Location

33km from Melbourne CBD. Nearest station: None - bus services.

This summary reflects general planning conditions for Thornhill Park as of 2025. Individual properties may have additional overlays or conditions. A property assessment confirms exactly what applies to your block.

Building design services in Thornhill Park

Whatever your project RD Building design can help.

New home design

Custom home design from initial brief through to permit-ready documents

Knockdown rebuild designs

A completely new design on your existing block, built around the life you want

Residential extensions and renovations

Additions that connect and blend with your existing home

Townhouses / Multi-Unit design

Multiple dwellings on one site, with all planning and documentation managed

The design and permit process

Every RD Building Design project follows a clear sequence.

Free consultation. We review your Thornhill Park property, discuss your goals, and confirm what permits are needed.
Feasibility. Your brief assessed against the site and the planning controls before any design work starts.
Concept design. Floor plans and elevations showing how the project sits on the block. Revisions are directed by you.
Planning permit (if required). Prepared, lodged, and managed through council assessment.
Building permit drawings. Complete documentation for permit and builder pricing.
Handover. Approved drawings ready for your builder.

RD Building Design serves homeowners across Melbourne's western suburbs and beyond.

Building design questions for Thornhill Park homeowners

Do I need planning approval to renovate in Thornhill Park?

Many renovations and extensions can proceed on a building permit alone under ResCode. Properties with heritage overlays or in special planning areas will generally need planning approval. RD Building Design determines this at the first consultation.

How long do permits take through Melton?

A building permit is typically assessed in about 10-20 business days. Planning permits through Melton generally take around 10-60 days. We set realistic expectations at the start of your project.

Can my Thornhill Park property support a granny flat?

Most NRZ and GRZ properties can add a secondary dwelling up to 60sqm without planning approval since Victoria's 2023 changes. The key constraints are site coverage, setbacks, and open space. RD Building Design confirms what your block allows.

What about adding a second level to my Thornhill Park home?

Second storey additions are viable on most properties, subject to structural capacity and planning requirements for overlooking, overshadowing, and neighbourhood character. We assess all of this at concept stage.

Should I renovate or knockdown rebuild in Thornhill Park?

It depends on the condition of the existing house and the cost-benefit of renovation versus starting fresh. For non-heritage properties, knockdown rebuild is usually an option. RD Building Design can advise on which path suits your situation.

Where do I start if I want to build on my Thornhill Park property?

Start with a property assessment. RD Building Design reviews your block against the Melton Planning Scheme and provides a clear written summary of what you can build, including extensions, <a href="/backyard-buildings/granny-flats/">granny flats</a>, and dual occupancy potential.

Contact RD Building Design Thornhill Park

Ready to talk about your Thornhill Park project?

Book a free consultation and we will review your property, discuss your goals, and give you an honest picture of what is possible.

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