Residential building design project Seddon, Melbourne western suburbs

Building designer in Seddon. Registered, western suburbs based

Extensions, dual occupancy, knockdown rebuilds. RD Building Design manages building design in Seddon from brief to permit.

Seddon is 7km from the CBD and one of Melbourne's most active renovation suburbs. Properties here carry real value, and owners who extend or develop thoughtfully see that compound.

RD Building Design is a registered building designer working across the Maribyrnong Planning Scheme. We understand how Maribyrnong applies its rules in practice and manage the full design and permit process in-house.

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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 Maribyrnong 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 Seddon 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.

Building in Seddon's heritage areas

Properties under a heritage overlay can still be extended and developed. The overlay shapes the design approach rather than preventing the project.

What Maribyrnong looks for is a design that respects the scale, form, and character of the original building. Contemporary additions are welcome provided they demonstrate that consideration.

RD Building Design has experience with heritage applications under the Maribyrnong Planning Scheme and advises early on what is required for your property.

Dual occupancy potential in Seddon

For Seddon properties on lots with adequate size and frontage, dual occupancy can be a genuine option.

The permit pathway is more complex than a standard extension, but the result is two separately titled dwellings on a single block.

RD Building Design assesses dual occupancy feasibility as part of every initial consultation. We confirm whether the numbers work before any design commitment.

House extensions on compact Seddon blocks

On Seddon's smaller lots, every extension decision has cascading effects. Adding floor area to one side tightens a setback. Going up triggers overlooking provisions. Covering outdoor space reduces the private open space calculation.

Getting these trade-offs right at design stage, rather than discovering them at permit assessment, is what separates a smooth project from an expensive rework. RD Building Design designs extensions on tight sites regularly and understands where the Maribyrnong Planning Scheme gives room to work with.

What you can build in Seddon

Planning controls and development potential under the Maribyrnong Planning Scheme

Council

Maribyrnong

Planning scheme

Maribyrnong 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

Heritage overlay

Heritage overlays apply to parts of this suburb. Works visible from the street typically require a planning permit. Rear additions may be exempt depending on the specific overlay schedule.

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

7km from Melbourne CBD. Nearest station: Seddon.

This summary reflects general planning conditions for Seddon 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 Seddon

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 Seddon 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 Seddon homeowners

Do I need planning approval to renovate in Seddon?

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 Maribyrnong?

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

Can my Seddon 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.

Is my Seddon block big enough for dual occupancy?

Under GRZ in Maribyrnong, dual occupancy typically needs at least 250sqm per resulting lot and appropriate frontage. RD Building Design reviews feasibility at the initial consultation before any design work.

Can I extend a heritage-listed home in Seddon?

Yes. Heritage overlays guide the design approach but do not prevent extensions. RD Building Design has experience working under the Maribyrnong Planning Scheme's heritage provisions and advises on what is required early in the process.

What about adding a second level to my Seddon 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 Seddon?

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 Seddon property?

Start with a property assessment. RD Building Design reviews your block against the Maribyrnong 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.

Ready to talk about your Seddon 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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