Buildline Renovations & Extensions
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Home Extensions & Additions

An extension should feel like it was always part of the house, not an afterthought bolted on the back. We design the addition to match the existing roofline, materials and flow, take it through council, and build it with our own team.

Get a fixed-price scope Call 02 6600 0000
Home Extensions & Additions by Buildline Renovations & Extensions
Scope

What this job includes.

  • ✓Ground-floor extensions — living, kitchen, bedroom
  • ✓Second-storey additions — full or partial
  • ✓Granny flats and detached studios (CDC or DA)
  • ✓Integrated design — matching existing roofline, materials, finishes
  • ✓Council approval managed in-house (DA or complying development)
Our system: Every extension starts with a site visit and a drawn scope. We price every line before you sign, and the contract is a fixed price — no open-ended time-and-materials.
How we quote it

Every line named, every figure explained.

You get a fixed-price contract with a line-by-line breakdown. Nothing changes without a written variation and your signed approval.

The renovation scope sheet
  1. 1 Site visit and measured scope. We walk the property, measure every room and note every constraint before we price a single line.
  2. 2 Drawn plans. Scaled floor plans and elevations showing what gets built, where, and how it connects to the existing home.
  3. 3 Council pathway mapped. DA or complying development, expected timeline, fees, and conditions, all explained before you sign the contract.
  4. 4 Fixed-price contract. Every inclusion listed, every exclusion named. The price is locked before the first wall moves.
  5. 5 Programme with dates. A construction programme with start, key milestones, and handover date, issued with the contract.
  6. 6 Variation protocol. Nothing changes without a written variation order, a revised price, and your signed approval.
If a quote doesn’t show these lines, you can’t compare it, and you don’t know what’s been cut.
How it runs

What happens, step by step.

1

Site visit and scope

We visit the property, listen to what you want, measure the existing home, and identify constraints (setbacks, services, soil, flood overlays). No charge for the visit.

2

Drawn plans and fixed price

We draw scaled plans, price every line, map the council pathway, and present a fixed-price contract. You see the plan, the price, and the permit pathway before you commit.

3

Council approval and pre-construction

We lodge the DA or CDC, engage the engineer, the certifier, and any specialist consultants, and schedule the build start date once approval is in hand.

4

Build and handover

One crew builds to the signed plans, on the programmed dates, with progress updates at every milestone. Handover includes a defect walk, certificates, warranties, and a maintenance guide.

Insured, covered, guaranteed

The paperwork behind the price.

Public liability to $20M + Home Building Compensation Fund, and a 6-year structural + Home Building Compensation Fund cover, all in writing, all on request.

We hold a NSW Fair Trading contractor licence, public liability and workers compensation insurance, and Home Building Compensation Fund cover on every residential project over $20,000. The warranty names what is covered, for how long, and what is excluded. Ask to see our certificates before signing any contract.

The cover, the guarantee, and how to check each one.
Proof · recent work

Home Extensions & Additions jobs we’ve done.

Dated single-storey brick home in Kingscliff before ground-floor extension Before
Completed ground-floor extension in Kingscliff with matched roofline and new living area After
Ground-floor extension, Kingscliff, Kingscliff. A 45m2 ground-floor extension with matched roofline and new open-plan living area.
See the full gallery
Questions, answered

Home Extensions & Additions: common questions.

How long does a typical extension take from start to finish?
A single-storey extension usually runs 12 to 16 weeks on site, but the full timeline including design, engineering and council approval is closer to 6 to 9 months. We map the whole timeline at the scoping stage so you know the real end date, not just the build time.
Do I need council approval for an extension?
Almost always, yes. Some smaller additions qualify for complying development (a faster pathway with a private certifier), but most extensions need a full DA through the local council. We manage whichever pathway applies and tell you the expected timeline and cost upfront.
Can you match the new work to my existing house?
That is the whole point. We match the roofline pitch, the cladding material, the window proportions and the internal trim so the extension reads as original, not an add-on. If the existing materials are discontinued we source the closest match and show you a sample before we order.

Read more before you book

Service

Full Home Renovations →

 Service

Kitchen Renovations →
Get started

See the plan, the price, and the permit 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.

✓ NSW Fair Trading licensed contractor✓ Insured to $20M + HBCF✓ Master Builders member✓ 74 five-star reviews✓ Fixed-price contract, no variations without written approval
Get a fixed-price scope Call