Residential building design project Derrimut, Melbourne western suburbs

Building designer servicing Derrimut. Full design and permit service

Residential building design from concept to approved permit. RD Building Design covers Derrimut and the western suburbs.

RD Building Design is a registered building designer based in Melbourne's western suburbs. We work across Brimbank and surrounding councils, managing residential projects from initial feasibility through to completed permit drawings.

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Who is RD Building Design?

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

A registered building design practice based in Melbourne's western suburbs, working across Brimbank and neighbouring councils.

We specialise in residential projects: extensions, granny flats, dual occupancy, knockdown rebuilds, and new homes. One designer leads your project from start to finish.

Straightforward communication, realistic timelines, and permit documentation that is right the first time.

Curious about the difference between a building designer and an architect?

Dual occupancy design in Derrimut

Dual occupancy is realistic for Derrimut homeowners with blocks in the right zone and of sufficient size. A two-lot subdivision typically requires a design meeting ResCode requirements, adequate frontage, and landscaping considerations.

The planning process is more involved than for extensions or granny flats, but the outcome, two separately titled properties, is substantially different financially.

RD Building Design carries out dual occupancy feasibility assessments at initial consultation. We review block size, zoning, and planning provisions before any design work, so you know whether the project is viable before committing.

Making the most of a Derrimut block

Smaller lots in Derrimut 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 Brimbank Planning Scheme applies to tighter blocks.

knockdown rebuild in Derrimut

When an existing Derrimut house has reached the end of its useful life, or when renovation costs exceed the value they would add, a knockdown rebuild gives you a home designed from scratch for your site, your household, and relevant planning controls.

The design can use the full site capacity allowed under the Brimbank Planning Scheme, oriented and configured for how you actually want to live.

RD Building Design manages knockdown rebuild projects from feasibility through to building permit.

What you can build in Derrimut

Planning controls and development potential under the Brimbank Planning Scheme

Council

Brimbank

Planning scheme

Brimbank 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.

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

Viable on selected lots

Some GRZ zoning available, but NRZ dominates or lot sizes limit opportunities. Feasibility depends on specific block dimensions and frontage.

Location

20km from Melbourne CBD. Nearest station: None - bus services.

This summary reflects general planning conditions for Derrimut 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 Derrimut

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 Derrimut 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 Derrimut homeowners

Do I need a planning permit to extend my house in Derrimut?

It depends on the work and your property's planning overlays. Many extensions can proceed directly to building permit under ResCode. Properties in heritage overlays or special planning areas usually require planning approval. RD Building Design assesses this at initial consultation.

How long does a building permit take in Derrimut?

A building permit application is typically assessed in 10-20 business days. Where a planning permit is required first, Brimbank assessment typically takes 10-60 days. RD Building Design advises on realistic timelines at the start of every project.

Can I build a granny flat on my Derrimut property?

Most residential lots zoned NRZ or GRZ can accommodate a secondary dwelling up to 60sqm without a planning permit under Victoria's 2023 provisions, subject to site coverage, setback, and open space requirements. RD Building Design confirms feasibility as part of an initial assessment.

Is dual occupancy viable on my Derrimut block?

It depends on your lot size, zoning, and frontage. RD Building Design carries out dual occupancy feasibility assessments at initial consultation.

Is a second storey addition possible on my Derrimut property?

In most cases, yes, subject to the existing structure's capacity and planning requirements for overlooking, overshadowing, and neighbourhood character. RD Building Design assesses structural and planning feasibility as part of the concept stage.

Can I do a knockdown rebuild in Derrimut?

If your property is not heritage-listed, a knockdown rebuild is usually viable. The replacement dwelling must comply with the Brimbank Planning Scheme for setbacks, site coverage, and neighbourhood character. RD Building Design confirms what the site allows before design begins.

How do I find out what I can build on my property in Derrimut?

RD Building Design offers a property assessment that reviews your block against the Brimbank Planning Scheme and gives you a written summary of what is buildable: extension capacity, granny flat viability, dual occupancy potential, and any constraints.

Talk to a building designer who knows Derrimut

A free consultation covers your project, your property's planning situation, and an honest assessment of what is achievable. No obligation.

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