Who can extend a heritage or character home in Melbourne, and what does the overlay allow?

Answering: Who can extend a heritage or character home in Melbourne, and what does the overlay allow?

Estimated reading time: 9 min read

Anyone with the owner’s authority can lodge a planning application to extend a Melbourne house. The overlay does not care whether the drawings came from a registered architect, a building designer, or an owner who drew them at the kitchen table. What it cares about is the place: a Heritage Overlay under Clause 43.01 generally requires a planning permit to demolish or remove a building, to construct a building, to externally alter one, and to carry out works, unless an exemption in the scheme or an incorporated plan says otherwise. A neighbourhood character overlay is a different control with a different test. Internal alterations need a planning permit only where the schedule to the overlay says so. Paint controls, tree controls and fence controls are likewise schedule-specific. A building permit is a separate approval, issued by a registered building surveyor under the Building Act 1993. BY Projects Architecture is a registered architecture practice, not a building designer, engineer, surveyor, town planner or lawyer. Across 59-plus heritage approvals, with a 98 per cent historical success rate, and 200-plus permit applications in 10-plus Victorian councils, the part we can honestly offer is design that reads the overlay at the start. That record is history. It is not a promise that your extension will be approved.

Owners often hear two unhelpful sentences: you cannot touch it, and just go to the rear, councils always allow it. Neither is the overlay. Who you hire changes the quality of the argument, not the fact that the argument has to be made. An honest pencil, used early, is worth more here than a confident one used late.

Key Insights

• The owner (or their agent) applies. Registration as an architect is not a legal prerequisite for lodging a planning application. Using a registered architect is a professional choice about design, documentation and accountability under the Architects Act, not a permit key.
• Clause 43.01 generally requires a planning permit for demolition, new buildings, external alteration and works in a Heritage Overlay. Exemptions exist, including some incorporated-plan exemptions, and they are site-specific. Always check the schedule.
• Internal works, external painting of already-painted surfaces, and some minor services may or may not need a permit depending on the schedule and on visibility. Do not assume a rear extension is exempt.
• A neighbourhood character overlay, or a zone schedule that talks about character, is not a Heritage Overlay. It can still refuse an extension that ignores the street. Confirm which control you actually have.

Keep reading for full details below.

Table of Contents

• Who can extend: owner, architect, building designer
• What a Heritage Overlay actually allows, and what it triggers
• Character is not heritage, and the Register is not an overlay
• How to find out what your place can take before you design it

Who can extend: owner, architect, building designer

The planning system does not reserve Heritage Overlay applications for architects. The owner applies, or an agent applies on the owner’s behalf. Builders, draftspeople, building designers and architects all lodge applications in Melbourne every week. The overlay will be assessed against the scheme, not against the author’s registration.

That is the legal fact. The practical fact is different, and it is not a ranking exercise.

A registered architect in Victoria is regulated by the Architects Registration Board of Victoria, must hold the required professional indemnity cover, and must use a written client-architect agreement before providing architectural services. That is a consumer protection and a professional standard. It is not a claim that other designers cannot produce a good rear addition.

A building designer is a different profession, differently regulated. Many Victorian extensions are designed by building designers, including some in overlays. We will not say they cannot do overlay work. We will say when the project in front of us is the complex work this practice is for: significant fabric, a difficult junction, or a brief that cannot be separated from the approval.

An engineer designs structure. A building surveyor issues the building permit. A town planner may be engaged to run the planning application. A lawyer runs a VCAT proceeding. We are none of those. On a substantial overlay project we often coordinate them. Confusing the roles is how owners end up with a beautiful drawing that cannot be certified, or a planning report attached to a form the overlay will not accept.

You do not need an architect’s registration to own the house or to apply. You need someone who can read the citation, the grading and the schedule, and design the extension as a response rather than as a fight.

What a Heritage Overlay actually allows, and what it triggers

Planning Victoria’s local heritage protection guidance is the state-level starting point: locally significant places are listed in the Heritage Overlay of the local planning scheme, under Clause 43.01, and protected under the Planning and Environment Act 1987. Councils are responsible for local heritage. Heritage Victoria and the Heritage Council are responsible for state heritage and historical archaeology.

Yarra City Council, as a live example of the standard trigger list, says a planning permit is normally required in a Heritage Overlay to:

• subdivide or consolidate land
• demolish or remove a building, including part of a building
• construct a building, including part of a building, or a fence
• externally alter a building
• construct or carry out works
• construct or display a sign
• externally paint an unpainted surface

Glen Eira publishes the same family of triggers, and notes that internal alteration controls apply only where the schedule identifies them, and that paint, internal and tree controls are schedule-specific. Most properties do not have internal controls. A rear extension is still “construct a building” and “externally alter.” Do not read “no internal controls” as “no permit for the addition.”

Exemptions exist. Clause 43.01 allows an incorporated plan to identify works that do not need a permit. Yarra publishes planning-permit exemptions in an incorporated plan. They are detailed, grading-sensitive, and easy to misread. Glen Eira lists some works that may not need a permit if they are not visible from a street (other than a lane) or a public park, with its own caveats. Other councils write different exemptions. There is no Melbourne-wide “rear additions are exempt” rule. Check the schedule to the overlay on your place, and check whether an incorporated plan is specified.

What the overlay is trying to allow, in plain language, is change that does not destroy why the place was listed. On a contributory house that usually means: keep the street presentation and roof form as the precinct reads them, and put the new work behind, below the ridge, out of the principal view. On an individually significant house it usually means: conserve the significant fabric and elevations, and make new work clearly secondary. On a not-contributory building in a precinct, you have more latitude, but you are still assessed for what you do to the precinct and to the significant neighbours. That is the grading system other articles on this site explain in full. Here it is only the overlay’s way of saying “not every house in the HO is protected in the same way.”

A permit can be granted, granted with conditions, or refused. The practice’s 59-plus heritage approvals and 98 per cent historical success rate are a record of past applications, attributed to the practice, never a guarantee of a future council or VCAT outcome.

Character is not heritage, and the Register is not an overlay

Three systems get mixed up in first conversations.

Local Heritage Overlay. Council. Clause 43.01. Fabric and precinct. This article’s main subject.

Victorian Heritage Register. State listing. Works generally need a heritage permit under the Heritage Act 2017, assessed by Heritage Victoria, not a Clause 43.01 planning permit for those Register works. Confirm on Heritage Victoria’s permits page.

Neighbourhood character overlay, or character policy in a residential zone. This is not a statement that your weatherboards are significant. It is a statement about preferred character: setbacks, height, landscaping, roof form, how the street reads. You can have a character control without a Heritage Overlay. You can have both. An extension that would be ordinary in a clear GRZ lot can fail a character test because it dominates the street or removes the garden the schedule is protecting. “Character home” in a real-estate listing is not a planning definition. Ask which clause is on the property report.

Demolition of a heritage building to make the extension easier is its own trigger, often the hardest. Partial demolition at the rear of a contributory building is a different argument from demolishing a significant front room. Do not design the new work until you know which demolition you are actually proposing.

How to find out what your place can take before you design it

1. Get a free planning property report and read the overlays, not just the zone.
2. Read the schedule to the Heritage Overlay: internal, paint, trees, incorporated plan, Register status.
3. Read the citation or statement of significance, and the grading. The overlay number alone does not tell you what is significant.
4. Sit in a feasibility session before the sketch becomes a set. Barbara sketches while you talk.

We work across 10-plus Victorian councils. The Clause 43.01 trigger list is shared. The citations are not. If the overlay will not take the brief, the cheapest time to hear that is the first conversation.

Closing

You can extend a heritage or character home in Melbourne. The overlay does not forbid architects, building designers or owners from applying. It forbids, unless permitted or exempted, demolition, construction and external change that would undo the significance or, in a character control, the preferred street. Read the schedule, read the citation, pick a designer whose skill matches the complexity, and do not confuse a building permit with a planning permit. To see how we read a site before design hardens, visit our process page.

Frequently Asked Questions

Q: Do I have to use an architect to extend a house in a Heritage Overlay?

A: No. The owner applies. A registered architect is a regulated professional choice, not a statutory gate. On a significant or contributory place, or a difficult junction, that choice is often the difference between an argument the overlay can accept and a drawing that fights it.

Q: Does a Heritage Overlay mean I cannot add a second storey?

A: Not as a blanket rule. Upper-level additions are assessed for visibility, roof form, and effect on significance. An addition that sits on the principal elevation faces a much harder argument than one that sits back, below the ridge as the street reads it, and leaves the significant fabric intact. The citation decides more than a rumour.

Q: Are rear extensions exempt?

A: Sometimes, where an incorporated plan or a specific exemption says so, often with visibility tests and grading limits. Do not assume it. A rear extension is still construction. Check the schedule and, if in doubt, ask council or us before you demolish.

Q: What if I have a neighbourhood character overlay but not a Heritage Overlay?

A: Then you are not in Clause 43.01. You may still need a planning permit, and the test will be character, amenity and the zone, not heritage fabric. Confirm the actual overlay. Real-estate “character home” language is not the scheme.

Q: Can BY guarantee approval?

A: No. The 59-plus heritage approvals and 98 per cent historical success rate are a record, not a promise of your outcome or timeline.

Want to Learn More?

Heritage and conservation are a deep strength and a proof source, not the boundary of the office. If your extension has to live with an overlay, we will read the overlay first. Schedule a feasibility session.

Citations

• Local heritage protection, Planning Victoria. Locally significant places are in the Heritage Overlay (Clause 43.01); councils are responsible for local heritage. https://www.planning.vic.gov.au/guides-and-resources/guides/all-guides/local-heritage-protection
• Heritage overlay, Yarra City Council. Live council statement of Clause 43.01 permit triggers (demolish, construct, externally alter, works, paint unpainted surfaces) and pointer to incorporated-plan exemptions. https://www.yarracity.vic.gov.au/planning-and-building/heritage/heritage-overlay
• Heritage Overlay controls, Glen Eira City Council. Same trigger family; internal, paint and tree controls only where the schedule says so; some visibility-based exemptions with caveats. https://www.gleneira.vic.gov.au/services/planning-and-building/heritage/heritage-overlay-controls
• VicSmart permits, Planning Victoria. 10-business-day path for defined classes only; not a substantial overlay extension by default. https://www.planning.vic.gov.au/guides-and-resources/guides/all-guides/vicsmart-permits
• Victorian Architects Code of Professional Conduct, ARBV. What “registered architect” means for the client agreement, as distinct from who may lodge a planning application. https://www.arbv.vic.gov.au/victorian-architects-code-professional-conduct

Heritage Victoria permits and consents (Register pathway): https://www.heritage.vic.gov.au/permits-and-approvals

About the Author

Barbara Yerondais, FRAIA, is the founder of BY Projects Architecture. With 35+ years of experience, she specializes in sustainable, community-focused design and heritage restoration. A dedicated mentor and rower, Barbara balances her high-impact Melbourne practice with a passion for social inclusion and passive, energy-saving design.