Residential building design project Keilor Downs, Melbourne western suburbs

Building design and permits for Keilor Downs properties

RD Building Design is a western suburbs building designer covering Brimbank 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 Brimbank.

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Working with 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 practice covering Brimbank and Melbourne's wider western suburbs. We work exclusively on residential projects.

Your project is led by an experienced building designer throughout. No hand-offs, no junior staff running the detail.

For Keilor Downs homeowners, that means clear advice, honest timelines, and permit drawings that do the job first time.

Building designer vs architect? Here is what the difference means for your project.

knockdown rebuild in Keilor Downs

When an existing Keilor Downs 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.

Building design for long-term homeowners in Keilor Downs

Most extension projects in Keilor Downs are driven by homeowners who intend to stay. The brief is personal: more space, better light, a layout that suits the household as it is now.

RD Building Design takes that seriously. We design around daily function, not spec appeal. Traffic flow, storage, the way rooms open to the outdoor spaces. The details that matter when you are living with the result.

Granny flats in Keilor Downs

Since Victoria's 2023 planning reforms, most residential properties can accommodate a secondary dwelling up to 60sqm without needing a planning permit. The building still needs to satisfy ResCode for setbacks, site coverage, and open space.

RD Building Design offers granny flat design and permits including our Boxed Buildings SIP panel range. These are precision-manufactured kits designed for fast on-site assembly. We design and document; your builder builds.

Site coverage is usually the binding constraint in Keilor Downs. We check feasibility before any design commitment.

What you can build in Keilor Downs

Planning controls and development potential under the Brimbank Planning Scheme

Council

Brimbank

Planning scheme

Brimbank Planning Scheme

Predominant zones

NRZ Neighbourhood residential zone

Limits housing growth. Maximum two dwellings per lot in most cases. No apartment-style development. Protects established neighbourhood character.

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

Medium to large (typically 500-800sqm+)

More design flexibility. Site coverage is rarely the binding constraint, allowing larger secondary dwellings and more generous setbacks.

Granny flat viability

Permitted up to 60sqm without a planning permit under Victoria's 2023 provisions. Most blocks have sufficient site coverage capacity for a well-sized secondary dwelling.

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

19km from Melbourne CBD. Nearest station: Keilor Plains.

This summary reflects general planning conditions for Keilor Downs 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 Keilor Downs

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

How building design works with RD Building Design

Here is how a typical project runs.

Initial consultation. We discuss your project, assess your Keilor Downs property's planning situation, and give you a clear picture of what is achievable. No fee.
Brief and feasibility. We assess your goals against the site and planning controls. This happens before design begins.
Concept design. Floor plans, external appearance, and how the project works on the block. You direct revisions.
Planning permit (where required). We prepare, submit, and manage the application through to decision.
Building permit documentation. Full working drawings for permit submission and builder pricing.
Approved drawings. A complete set any registered builder can price from and build to.

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

Building design questions for Keilor Downs homeowners

Will I need a planning permit to extend in Keilor Downs?

That depends on the scope of the work and any overlays on your property. Many standard extensions go straight to building permit. Heritage or design overlay areas typically need planning approval first. We check this at your initial consultation.

What is the typical permit timeline in Keilor Downs?

Building permits are usually assessed in around 10-20 business days. If a planning permit is needed, Brimbank generally takes about 10-60 days. RD Building Design provides realistic timelines at the outset of every project.

Is a granny flat possible on my Keilor Downs block?

Under Victoria's 2023 reforms, a secondary dwelling up to 60sqm can be built on most NRZ and GRZ lots without a planning permit, provided site coverage, setback, and open space requirements are met. We assess this as part of an initial consultation.

Is a knockdown rebuild an option in Keilor Downs?

For properties without a heritage overlay, knockdown rebuild is generally viable. The new dwelling must comply with the Brimbank Planning Scheme for setbacks, coverage, and character. We confirm feasibility before design starts.

How can I find out what is buildable on my Keilor Downs property?

A property assessment from RD Building Design reviews your block against the Brimbank Planning Scheme and provides a written summary of development potential, including extension capacity, granny flat viability, and dual occupancy options.

Talk to a building designer who knows Keilor Downs

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

Book a free consultation View our building design services