Buildline Renovations & Extensions What renovations and extensions actually cost on the Tweed Coast.
Renovation quotes vary because scope varies. We publish indicative ranges, name the factors that move the number, and show you how we build the fixed-price contract so you can compare builders on the same terms.
Ballpark your renovation in under a minute.
A guide, not a quote. Enter the basics and see where your job sits before you call anyone.
What kind of renovation do you need?
Answer five questions and see an indicative range in under a minute. No email required.
Your estimate appears here.
Step through the questions on the left. As soon as you answer the last one, we point you to the honest scope and a realistic range for a job your size.
What each type of job typically costs.
| Budget builder (verbal quote) (No plans, no contract, no programme. Price changes mid-build.) | $1,200 to $1,600/m² |
| Standard renovation (Written quote but minimal plans. Programme issued verbally.) | $1,800 to $2,400/m² |
| Quality renovation (where we sit) (Drawn plans, fixed-price contract, council-managed, full handover pack.) | $2,500 to $3,500/m² |
| Premium/architect-led (Architect-designed, high-spec finishes, heritage/character overlay work.) | $3,500 to $5,000+/m² |
Six things that decide where your quote lands.
Every quote is site-specific. These are the factors that push the number up or down.
Six levers. One honest range.
Scope of work
A kitchen renovation is different from a whole-house gut. The number of rooms, walls moving, and services relocated all move the price.
Finishes and fixtures
Laminate benchtops vs stone, builder-grade tapware vs premium, stock cabinetry vs custom joinery. The finish level is the single biggest variable.
Structural changes
Removing a load-bearing wall, adding a second storey, or underpinning foundations all require engineering and add cost. We scope these before you sign.
Site access and conditions
Sloping blocks, flood overlays, asbestos, tight access for deliveries, and heritage overlays all add cost. We identify them at the site visit.
Council pathway
A complying development certificate (faster, private certifier) costs less than a full DA (council assessment, neighbour notification, potential conditions).
Every line named, every figure explained.
We walk you through the written quote so you know what you are paying for before you sign.
Seven lines. Every one in writing.
- 01Site visit and measured scope
- 02Drawn plans
- 03Council pathway mapped
- 04Fixed-price contract
- 05Programme with dates
- 06Variation protocol
“$4,500 the house” by text → seven lines, priced.
- 1 Site visit and measured scope. We walk the property, measure every room and note every constraint before we price a single line.
- 2 Drawn plans. Scaled floor plans and elevations showing what gets built, where, and how it connects to the existing home.
- 3 Council pathway mapped. DA or complying development, expected timeline, fees, and conditions, all explained before you sign the contract.
- 4 Fixed-price contract. Every inclusion listed, every exclusion named. The price is locked before the first wall moves.
- 5 Programme with dates. A construction programme with start, key milestones, and handover date, issued with the contract.
- 6 Variation protocol. Nothing changes without a written variation order, a revised price, and your signed approval.
What you get from us
- ✓Fixed-price contract with every line itemised before work starts
- ✓Drawn plans and council pathway explained at the quoting stage
- ✓One team from design through handover, one point of contact
- ✓Written variation orders with revised price before any change
- ✓Waterproofing certificate, engineering sign-off, and handover pack
Cowboy tells
- ✕Verbal quote, "we will sort the price as we go"
- ✕No plans, "the boys know what they are doing"
- ✕Different subcontractors every week, nobody in charge
- ✕Extras added mid-build, invoiced after the fact
- ✕No certificates, "it will be fine, trust me"
A fixed, itemised contract. No surprises mid-build.
Every contract lists exactly what you get, line by line, before you commit to anything.
- Measured scope and drawn plansEvery dimension measured on site. Scaled plans and elevations drawn before the price is set.
- Named materials and finishesMake, model, and colour on the page. Never "or equivalent" or "provisional sum".
- Council pathway and feesDA or CDC, expected timeline, lodgement fees, and conditions, all included in the contract.
- A single fixed priceLocked before work starts. Variations only by written order with your signed approval.
Anything outside this scope is quoted separately, in writing, before it happens.
Fixed price
Locked before the first wall moves
Four scope levels, one contract.
Kitchen or bathroom renovation
Strip-out and rebuild of one room. Typically the kitchen, bathroom, or laundry.
Wrong when: Multiple rooms need work, or the layout needs to change across the floor plan.
Home renovation (multi-room)
Kitchen, bathroom, living areas, or a whole-house renovation. One contract, one team.
Wrong when: You need more space (that is an extension, not a renovation).
Home extension or addition
Ground-floor extension, second-storey addition, or granny flat. Adds square metres to the home.
Wrong when: The block is too small, the setbacks do not work, or the soil cannot take the load.
Deck, pergola, or outdoor living
Hardwood or composite deck, insulated pergola, outdoor kitchen. Built for the Tweed Coast climate.
Wrong when: You are looking for a cheap treated-pine deck (we do not build those on the coast).
What homeowners ask about cost.
Is the quote you give me really fixed?
Do I pay anything before the work starts?
Why do renovation quotes vary so much between builders?
Can I see an itemised breakdown before I sign?
Read deeper before you compare quotes
See the plan, the price, and the council pathway before you commit.
Tell us what you want to change about your home. We visit, draw a scope, price every line, and walk you through the council process before you sign anything.