Sunrooms and glass rooms in Melbourne: permits, Heritage Overlays and builders

Quick answer: an enclosed sunroom in Melbourne is building work that normally needs a building permit from a registered building surveyor; only small open structures such as a pergola of up to 20 m² are exempt. If the house is in a Heritage Overlay, you also usually need a planning permit from the council to build or carry out works. Domestic building work over $10,000 must be done by a registered builder, and for contracts signed from 1 July 2026 the state’s new Home Warranty scheme covers eligible work over $20,000.

A note on words: in Australia a sunroom usually means an enclosed, glazed room with a solid or insulated roof; a glass room is a more fully glazed version, often sold as a four-season room; and a patio room or patio enclosure is an existing roofed patio or alfresco area closed in with glass, sliding doors or louvres. For approvals, what matters is whether it is still an open patio or has become a room. Our Australian costs guide explains how the choice changes the price, and our guide to enclosing an existing patio in Australia covers the structural questions.

Building permit: what is exempt in Victoria

The Building Regulations 2018 (Vic) define a pergola as an open structure that is unroofed but may have a covering of open-weave permeable material. Schedule 3 exempts a pergola from a building permit if it is no more than 3.6 m high, has a floor area of no more than 20 m² and, next to a house, sits no more than 2.5 m forward of the front wall. A roofed, glazed and enclosed sunroom is not on that list, so plan on a building permit. The building surveyor checks structure, siting, energy efficiency and, where it applies, bushfire construction.

Structure	Building permit in Victoria?
Open pergola, up to 3.6 m high and 20 m²	Exempt (Schedule 3), subject to its conditions
Roofed verandah or patio	Usually needs a permit; siting rules for porches, verandahs and pergolas apply
Enclosed sunroom or glass room	Needs a building permit from a registered building surveyor
Any of the above in a Heritage Overlay	Usually also a planning permit from the council

Source: Building Regulations 2018 (Vic), regulation 5 definitions and Schedule 3 (legislation.vic.gov.au), as amended to 2026. Council planning rules are separate from the building permit.

Heritage Overlays in Melbourne

Metropolitan Melbourne is split between 31 councils, and heritage is controlled through each council’s planning scheme by the Heritage Overlay at clause 43.01. Under it, a planning permit is generally needed to construct a building or carry out works, which includes a sunroom at the back of a heritage house. Your property’s HO number points to a row in the schedule to clause 43.01 that says whether extra controls apply, such as external paint, interior or tree controls.

For the City of Melbourne (the CBD, Carlton, North Melbourne, East Melbourne, Parkville, Kensington and South Yarra west of Punt Road), the council’s heritage owners’ FAQ says:

new work must respect heritage significance and be identifiable as new; its policies encourage contextual design that avoids copying historic forms and details;
full demolition of a significant or contributory building will not generally be permitted, and how much fabric you can remove is decided case by case against the statement of significance;
interior changes usually need no permit, as internal controls are rare, and like-for-like repairs are exempt;
it recommends talking to a planner before you lodge.

In practice, a glass room that is clearly modern, lower than the original roofline and hidden behind the house has the best chance. Inner suburbs such as Fitzroy, Collingwood, Richmond, Brunswick and Williamstown have their own councils and heritage schedules, so check the planning property report for your address first.

Registered builders and the new Home Warranty

Rule (Victoria)	Threshold
Registered builder and a major domestic building contract	Domestic building work over $10,000 (labour, materials and GST)
Home Warranty (contracts signed from 1 July 2026)	Eligible domestic building work over $20,000; up to $400,000 of assistance per home
Domestic Building Insurance (contracts before 1 July 2026)	Was required over $16,000; existing policies continue

Sources: Engaging a builder; Domestic Building Insurance and Home Warranty, updated 1 July 2026 (bpc.vic.gov.au). The Building and Plumbing Commission (BPC) is the Victorian Building Authority’s trading name.

Home Warranty is broader than the old DBI: the BPC says it can apply when eligible work is incomplete, defective or non-compliant and the builder fails or refuses to fix it, not only when the builder has died, disappeared or become insolvent. The builder pays the premium and you receive a Notice of Cover.

Bushfire-prone land: BAL and glazing

If the lot is mapped as bushfire prone, the building gets a Bushfire Attack Level (BAL) under AS 3959-2018: BAL-LOW, 12.5, 19, 29, 40 or FZ (flame zone). The glazing rules tighten at each step, so the BAL often decides which glass and frames a sunroom can use:

BAL	What it means for the glass (deemed-to-satisfy route)
BAL-LOW	No specific bushfire construction requirements
BAL-12.5 and 19	Metal, metal-reinforced uPVC or suitable timber frames; toughened glass at least 4 mm for low-level glazing (within 400 mm of the ground or a deck) and in doors; ember screens on opening windows
BAL-29	Toughened glass at least 5 mm in windows and 6 mm in doors; low-level window glazing screened externally
BAL-40 and FZ	Usually a window system tested to AS 1530.8.1 or .8.2, or bushfire shutters; ask for the test certificate

Sources: BAL 12.5 and BAL 29 construction reference guides, AS 3959:2018 (bushfiredesignconsultants.com.au). A summary only: the standard has several compliance paths, so the certifier and supplier must confirm the product.

Melbourne’s outer east and north, including the Dandenong Ranges and parts of Nillumbik, are designated bushfire prone areas, and some also sit in a Bushfire Management Overlay that brings its own planning controls.

Typical private prices

We have not found a reliable sunroom price survey for Melbourne alone, so use the national ranges in our Australian costs guide. Barry Building Supplies (June 2026) puts a basic patio enclosure with a polycarbonate roof at $15,000–$25,000, a mid-range insulated-roof sunroom at $25,000–$45,000 and a full four-season glass room at $60,000–$90,000 or more; enclosing a patio that already has a roof and slab runs about $12,000–$30,000. Airtasker (July 2026) uses $1,500–$3,500 per m² as the national range. Electrics, cooling, flooring, drawings and approval fees are often extra; see what to include in a realistic budget.

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How to choose a builder in Melbourne

Check registration. Use the BPC’s licence and registration check. Over $10,000, the BPC warns, an unregistered builder leaves you without the usual protections.
Ask about Home Warranty. For a contract signed from 1 July 2026 and worth more than $20,000, ask how the Home Warranty premium is handled and when you will get the Notice of Cover.
Get it in writing. Ask for a fixed-price written contract that says what is and is not included: slab or footings, drainage, electrics, approvals, engineering and the BAL assessment if you need one.
Who is the certifier? Ask whether the price includes the building approval or permit, who lodges it and whether the drawings treat the room as an enclosed habitable space or an open patio.
Glass and energy. Ask what glass is used (single or double glazing, low-E, toughened or laminated) and whether it meets the energy-efficiency and safety-glass rules for a habitable room. Our guide to glazing, U-values and safety glass explains the terms.
Pay in stages. Tie payments to finished stages. Our guide to surveys, contracts and payment stages has a checklist, and comparing quotes helps you line up like with like.

Sunroom and enclosure firms serving Melbourne

These businesses appear in public business listings for the area. We have not checked their work, prices, licences or insurance, and they have not paid to appear. Check any licence on the state register yourself before you sign.