How Much Does a Major Home Renovation Cost on the Sunshine Coast?

A major home renovation on the Sunshine Coast is priced by scope, not by the size of your house. What matters is how deep into the structure you go. A cosmetic refresh, a wet-area rebuild, an internal restructure, a ground-floor extension, a second storey and a whole-house rebuild all sit at genuinely different rates per square metre, and that rate climbs as the structural work deepens. Regulated markers tell you where your project sits: the QBCC requires a written contract for domestic building work valued over $3,300, a Level 2 Renovation, Extension and Repair Contract once the job reaches $20,000, and home warranty insurance on most residential building work valued at more than $3,300. Anyone quoting a single dollar-per-square-metre figure before they have seen your slab, roof frame, services and site access is guessing. Here is how the bands actually behave against building new on the same block.

What counts as a major renovation, and why the definition changes the price

The line between a renovation and a major renovation is structural. Once you remove load-bearing walls, alter the roof, cut new openings into external walls, add floor area or change the footprint, you are into engineered work: an engineer’s design, temporary propping, footing verification under new point loads, and a building approval. Everything before that line is finishes work, and finishes work is far more predictable to price.

That distinction drives your budget more than any material selection. Two Coolum Beach houses of identical size can be renovated for very different figures because one keeps the structure and the other rearranges it. A kitchen and two bathrooms replaced in the same footprint is a contained job; the same house with the rear wall opened up, a new roof over an extended living area and a first-floor addition over the garage is a different category of project, with different engineering, certification and insurance.

Scale matters too. Master Builders Queensland’s 2025 Sunshine Coast Housing & Construction Awards ran a category for Home Renovation/Remodelling Project over $1 million, which is the band our Grandview Drive project at Coolum Beach won. Major renovations here do run that high when a home is stripped back, restructured and re-serviced end to end.

Cost bands by renovation scope, compared per square metre against a new build

The useful thing is not a dollar figure we cannot source, but the shape of the curve. This table sets out the six scope bands we price most often, where each sits per square metre against building new on the same block, the drivers behind the rate, and the QBCC contract level it triggers.

Read that table as a relationship, not a price list. If you want a firm rate to test against, start from what new construction costs locally in our guide to the cost to build a house on the Sunshine Coast, then apply the direction of travel above. We work through the arithmetic in renovation cost per square metre in Queensland.

Why renovating costs more per square metre than building new

New construction is efficient because the site is clear, the sequence is uninterrupted and the quantities are large enough to buy well. A renovation gives up all three. You work around an existing building, which means demolition, protection of what stays, propping while load paths are transferred, and hand work where a new build would use machinery. You match into floor levels, ceiling heights, roof pitches and brick courses set decades ago and rarely square. Trades return more often for smaller portions of work, each visit carrying much the same mobilisation cost as a bigger one. Deliveries and waste removal are harder on a built-out block, particularly on the narrow beachside streets around Coolum, Marcus Beach and Noosa Heads.

Then there is what you cannot see until you open it up: termite damage in a 1980s frame, undersized footings, non-compliant wiring, asbestos in eaves and wet-area linings, and roof structures never designed for the spans an open-plan layout demands. None of that is visible at quoting stage, which is why the contract mechanics for variations and provisional sums matter as much as the headline number. If those conditions stack up badly enough, the honest answer is sometimes to start again, and we set out how to make that call in renovate or knock down and rebuild.

The QBCC thresholds your renovation budget will cross

Queensland regulates domestic building work by contract value, so your budget determines your legal protections. These are the thresholds worth knowing before you sign.

The deposit column surprises people. QBCC allows a 20% deposit on work valued at $3,300 or less, and on larger contracts only where substantial customised work is made off site and represents more than half the contract price, such as bespoke cabinetry or windows. On an ordinary major renovation over $20,000, 5% is the cap. If a builder asks for more up front, ask why.

The cover has limits too. The QBCC caps assistance at $200,000 for each category of claim, including up to $5,000 combined for alternative accommodation, removal and storage, rising to $300,000 where optional additional cover has been taken out. Above those limits the insurance is a backstop, not a substitute for choosing a builder carefully, so check the licence first. Our guide on how to check a QBCC licence walks through the register. Roebuck Concepts holds QBCC company licence 15280811, and Tom Roebuck holds individual licence 15015060.

Sunshine Coast and Noosa conditions that move the number

Coastal Queensland adds costs a comparable inland renovation never sees, and they are real line items rather than rounding.

• Corrosion. AS 4312 classifies atmospheric corrosivity by proximity to breaking surf and other sources of airborne salt. Sites at Coolum Beach, Yaroomba, Marcus Beach and Noosa sit in higher categories than land a few kilometres inland, pushing you toward marine-grade fixings, upgraded coating classes on roofing and framing brackets, and better-specified hardware and window suites. Substituting standard products on a beachside renovation just moves the cost into year six.
• Wind. AS 4055 sets wind classifications for housing, and coastal exposure raises the class. A higher classification changes bracing, tie-down and glazing, and applies to the existing structure you are altering as well as the new work.
• Slope and access. Ninderry, parts of Noosa Heads and the hinterland edges are steep. Slope drives retaining, engineered footings under AS 2870, crane and concrete pump hire, and a longer program.
• Overlay mapping. The Sunshine Coast Planning Scheme 2014, which commenced on 21 May 2014, and the Noosa Plan 2020, adopted in July 2020 and most recently amended by Amendment No. 3 commencing on 20 March 2026, both sit over mapped constraints as well as zones. Sunshine Coast Council’s building guidance states that all construction and building works need to consider the flood hazard area where the works will take place. Mapping of that kind rarely stops a renovation, but it can add engineering, a bushfire attack level assessment under AS 3959, or a planning application you had not budgeted for, so check what applies at your address before you set a budget.

Planning approval, building approval, or both?

Most Sunshine Coast and Noosa renovations need a building approval and nothing more. The Queensland Government confirms a building development approval is needed before construction can start on most types of domestic building work, and that you can get one from your local government or a building certifier. Sunshine Coast Council’s guidance is that a private building certifier can advise whether you need a development permit for building work.

You move into planning approval territory when the work does not meet the assessment benchmarks in the applicable scheme, typically on building height, boundary setbacks, site cover, or an overlay trigger. That is common on second-storey additions and on beachfront sites where height and setback controls are tight. A planning application adds months, not weeks, and belongs in your program from day one. We go through the sequence in building approvals on the Sunshine Coast and Noosa.

Design partners matter here. Working alongside practices such as K Architecture and Reitsma & Associates, we resolve the planning position before pricing is locked, which is a far cheaper place to solve a height or setback problem than on site. You can see how that plays out on Columba Place at Pelican Waters.

Where major renovation budgets actually blow out

In our experience there are four causes, and three of them are contractual rather than technical.

• Scope that was never fully documented. If the drawings and specification do not name the tile, tapware, appliance, window suite and paint system, the price is not really a price. Allowances get consumed and the difference lands on you.
• Provisional sums used instead of design. A provisional sum is legitimate for genuinely unknowable work, such as footing repairs behind a wall nobody has opened. It is not a way to defer decisions that could have been made before signing.
• Variations handled loosely. QBCC requires a variation to be put to you in writing and agreed in writing, with a copy given to the owner before the earlier of the variation work starting or five business days from the day both parties agree to it. A builder cannot require payment for a variation before the variation work has started. If variations are being agreed verbally on site, the budget is already out of control.
• Unknown existing conditions. The only real defence is investigation before pricing: lifting floor coverings, opening a section of ceiling, checking the switchboard, testing for asbestos, and having an engineer look at the footings and frame.

A properly documented fixed-price contract absorbs the first three. Our guide to fixed-price building contracts in Queensland explains what a fixed price does and does not cover, and how variations sit alongside it.

What the market data says about renovation spending

Renovation is a substantial part of Australian residential construction, not a fringe activity. The Australian Bureau of Statistics reported in Building Activity, Australia for the March quarter 2026, released on 8 July 2026, that $3,976.2 million of alterations and additions to residential building work was done nationally, against $23,162.8 million of new residential building work, both seasonally adjusted chain volume measures. That puts renovation at a little over one-sixth the value of new residential construction.

The approvals pipeline is softer. ABS Building Approvals, Australia for July 2026, released on 1 September 2026, put the value of alterations and additions at $1,288 million seasonally adjusted, down 3.9% for the month, with the trend estimate at $1.33 billion. In Queensland, 2,239 private sector houses were approved in the same month, down 5.5%. Worth remembering when you read those numbers: approvals describe work about to start, not the work already in the ground, so a softer approvals month does not shorten subcontractor lead times on the Coast straight away.

How to get a number you can act on

A ballpark range from a website will not tell you what your renovation costs. A structured pre-construction process will: a measured survey of the existing house, a design resolved so structure and services are coordinated, an engineer’s input on footings and framing, a specification naming products rather than categories, and a planning check against the applicable scheme before pricing. Only then does a fixed price mean anything.

Roebuck Concepts works across the Sunshine Coast and Noosa Shire from our office at Unit 1/18 Lomandra Place, Coolum Beach. Tom Roebuck has more than 20 years in residential construction, and we are members of Master Builders Queensland. To talk through where your project sits in the bands above, call 0477 333 386 or read how we approach renovation building on the Sunshine Coast.