Renovate or rebuild on the South Coast: how to make the right call (2026)

Most South Coast homeowners asking this question own a block they want to keep and a home that no longer fits. The right call usually comes down to three things: whether the structure is worth saving, what your block's planning controls allow, and whether the cost gap between the two paths is as wide as you expect.

The 60% rule of thumb

A widely used rule in the building industry: if your renovation budget is heading toward 60% or more of the cost of a comparable new home on the same block, a knockdown rebuild deserves serious consideration. At that level, you are spending significant money without the benefits of a new structure, a full statutory warranty, and modern energy performance. Below 60%, renovation often stacks up well, particularly when the bones are sound and the layout works. Either way, this is a starting point. On the South Coast, where coastal exposure, slope, and site access affect costs in both directions, it pays to get proper quotes for both paths before committing.

What renovation actually costs

Full renovation and extension work in NSW runs $2,000 to $4,500 per square metre for standard to good quality work, depending on scope and finish. Cosmetic-only work (new kitchen, bathrooms, and painting without structural changes) sits at the lower end. Structural work (lifting rooflines, extending footings, removing load-bearing walls) pushes toward $4,500 per square metre and above. For a 200 m² home, a full structural renovation can realistically cost $400,000 to $900,000 before factoring in temporary accommodation. On older South Coast homes, asbestos is a common complication. Many homes built before the mid-1980s contain asbestos in fibro sheeting, roofing, or ceiling tiles. Removal adds $5,000 to $20,000 or more, which can close the cost gap with a rebuild faster than expected.

What a knockdown rebuild costs on the South Coast

Demolition runs $20,000 to $40,000 for a standard South Coast home, plus $5,000 to $20,000 if asbestos is present. A new custom home on our patch of coast then costs $4,000 to $7,000 per square metre all-in. The full breakdown is in the cost guide. For sloping or coastal sites, ground conditions vary significantly and site costs can shift the total materially in either direction. The sloping and coastal block guide covers those costs in detail.

When renovation is the right call

Renovation tends to make sense when the layout works and you are mainly updating finishes, systems, or adding a modest extension; when the structure is genuinely sound with no rot, rising damp, or significant foundation issues; when lot constraints (setbacks or floor space ratio limits) mean a new home would be smaller than the existing one; or when the property is heritage listed or within a heritage conservation area, where Eurobodalla Council will generally not permit full demolition.

When to rebuild instead

A knockdown rebuild is worth serious consideration when the current layout cannot be fixed at a reasonable cost through renovation; when structural problems are widespread (extensive asbestos, inadequate footings, significant rot); when you want a new home meeting the current 7-star NatHERS thermal standard, which is far easier and more cost-effective to achieve in a purpose-designed build than by retrofitting an existing structure; or when renovation estimates are approaching what a new home would cost, leaving you with older systems and structure either way. For a detailed cost comparison, see knockdown rebuild on the South Coast: what it costs and whether it’s worth it.

South Coast specifics to check first

BAL rating. If your block carries a high Bushfire Attack Level, any new construction must comply with current AS 3959 building standards. BAL-40 and BAL-FZ construction adds meaningful cost to a rebuild. An existing home may sit under older approvals, though significant alterations can trigger updated BAL assessment. Confirm this with your builder early rather than discovering the compliance requirements mid-design.

Heritage. Eurobodalla has heritage-listed properties and heritage conservation areas, particularly in older town centres like Moruya and Broulee village. If your property is listed or within a conservation area, full demolition is generally not permitted and external renovation work visible from the street requires careful design. A Section 10.7 planning certificate from Eurobodalla Council confirms exactly what controls apply to your property before you commit to either path.

Coastal and flood constraints. Properties in coastal management areas may face setback requirements that affect what you can build and where. Some blocks near waterways have flood planning levels that constrain fill and floor heights for a new home. The sloping and coastal block guide explains how these planning controls work in practice.

Planning and approvals for each path

A renovation under complying development can be approved in around 10 business days for straightforward work that meets all code criteria. Structural extensions or heritage properties need a development application (DA), which in Eurobodalla averaged around 66 days through the second half of 2025 (per Eurobodalla Council data). A knockdown rebuild requires demolition approval, also obtainable as complying development in most cases, and then a DA or CDC for the new home. Homes in BAL-40 or BAL-FZ zones cannot use the CDC path for the new home and must go through a full DA. The DA and CC approval guide covers both pathways in full.

Is it cheaper to renovate or rebuild in NSW?

Renovation is usually cheaper upfront. Full structural renovation in NSW runs $2,000 to $4,500 per square metre; a new custom home on the South Coast runs $4,000 to $7,000 per square metre all-in, plus demolition at $20,000 to $40,000. If your renovation budget is heading toward 60% of what a new home would cost on the same block, the gap is narrower than most people expect, especially once asbestos removal, temporary accommodation, and the disruption of building around an occupied home are factored in.

Can I knock down my South Coast home and rebuild?

In most cases, yes. Demolition can be approved through complying development without a full DA, provided the site meets the relevant code criteria. Heritage-listed properties and those in heritage conservation areas are the main exception, where full demolition is generally not permitted. BAL-40 and BAL-FZ sites require a DA rather than a CDC for the new home, though demolition itself can still proceed as complying development.

Do I need council approval to renovate in NSW?

It depends on the scope. Minor works may be exempt development, requiring no approval at all. Standard renovations and extensions that meet all code criteria can go through complying development, typically approved in around 10 business days. Structural extensions, multi-storey additions, or work on heritage properties require a DA. The DA and CC approval guide covers what each pathway involves and when each one applies.

Does a knockdown rebuild affect stamp duty?

No. You do not pay stamp duty on a knockdown rebuild because you already own the land. Demolishing the existing home and constructing a new one does not trigger a new transfer of title. Council rates may be reassessed once the new home is completed, based on the improved capital value. Speak with your accountant about any capital gains tax implications if the property is an investment rather than your primary residence.

Deciding between renovation and rebuilding comes down to the structure, the block, and the numbers. Perrem works across both: renovations and extensions and knockdown rebuilds. Talk to us about which path makes sense for your property.

Last reviewed: August 2026.