Home Extensions & Additions
Transform your existing home with a professionally designed extension or addition. Whether you need a rear ground floor extension, a second storey addition, or a kitchen and living area expansion, we design for seamless integration with your existing home — and handle all planning and building permits so the process is stress-free.
- Rear & Side Ground Floor Extensions
- Second Storey Additions
- Kitchen & Living Expansions
- Outdoor Living & Alfresco Areas
- Planning & Building Permits
Our Extension Design Process
Expanding your home with designs that integrate seamlessly with existing architecture — maximising space, light and liveability.
Site & Structural Assessment
We evaluate your existing home's structure, available footprint, site coverage, setbacks and any heritage or neighbourhood character overlays to determine the best extension approach and confirm what's achievable.
Extension Design & Integration
We design extensions that complement your home's existing character while delivering the space and functionality you need — optimised for natural light, connection to outdoor areas and seamless flow between old and new.
Planning Permit (Where Required)
Many extensions don't require a planning permit — but when one is needed (heritage overlays, tight setbacks, overlooking issues), we manage the council application from lodgement through to permit issue.
Working Drawings & Building Permit
Detailed construction drawings including structural details, material specifications, waterproofing details and NCC compliance documentation — ready for your builder to progress immediately to construction.
Free Quote — No Obligation
3 quick steps to your free quote
Tap an option or fill in each field — it takes under a minute, and a designer follows up personally within 1 business day.
Step 1 of 3 — tap one to continue
What are you looking to build?
Select the service that best matches your project
Step 2 of 3
Where is the project located?
We'll check council zone and permit requirements for your address
Step 3 of 3 — last one
How do we reach you?
We'll be in touch within 1 business day with a free quote and site assessment
Enquiry received
We'll be in touch shortly. The PD Studio team will review your project and respond within 1 business day with a free quote and site assessment.
FAQ
Common questions about home extensions and additions in Melbourne
Most single-storey rear extensions in residential zones do not require a planning permit, provided they comply with ResCode setback, site coverage, overlooking and overshadowing requirements. Second storey additions can trigger permit requirements.
Yes. All extensions and additions involving structural work require a building permit under the Building Act 1993, including rear extensions, second storey additions and garage conversions.
Site coverage is the percentage of your lot covered by buildings and impervious surfaces. Under ResCode Standard B8, site coverage for single dwellings is generally limited to 60% of the lot area.
Yes, in most residential zones a second storey addition is permitted subject to ResCode — primarily overlooking (Standard B22), overshadowing (B21) and setback requirements. Heritage overlays may restrict additions.
A heritage overlay requires a planning permit for any external alterations, including extensions. PD Studio prepares heritage-sensitive designs that work within council's heritage guidelines while achieving your functional brief.
ResCode Standard B22 requires that habitable room windows and raised balconies that overlook neighbouring private open space within 9 metres be obscured to 1.7m above floor level, screened or oriented away from the neighbouring property.
Yes. PD Studio coordinates structural engineering for all extensions that require it — including new footings, steel beams and waterproofing specifications — included in the building permit documentation package.
Design fees depend on the extension size and complexity, whether a planning permit is required and the level of engineering detail needed. PD Studio provides a fixed-fee quote after a free site discussion.