Major renovation in progress

Change how your home works. Not just how it looks.

Structural renovations and extensions that add real rooms, better flow and genuine floor area — single or multi-storey, with the approvals managed end-to-end.

Start a Project How we work
Where
Townsville & North QLD
Typical duration
3–6 months typical
Typical range
$500k–$900k typical
Overview

Done right, it looks like it was always there.

JKC’s major renovations and extensions are structural projects that change how an existing home works: opening it up, adding rooms, or extending out and up. We coordinate engineering, approvals and trades as one job. Standalone cosmetic renovations are not the right fit.

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Structural, not cosmetic

The work we take on materially changes a house — walls, floors, rooflines, whole new levels — not its paint and fittings. That's a deliberate line: no standalone bathrooms, kitchens or laundries, and no cosmetic refreshes. If your project is structural, you've found a builder who does this week in, week out; if it isn't, we'll say so on the first call.

See the renovations

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Single & multi-storey extensions

Serene Ct was a brick house that gained a steel-framed extension at both ends, with the original chimney breast kept and made the heart of the room. Tippett St was stripped to its frame at the rear and rebuilt on new galvanised columns and a portal frame. Up or out, single or multi-storey — the new work has to tie into the old structure properly, and that's where we spend the most care.

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Approvals managed

Structural work needs engineering and council approval, and we coordinate both as part of every project. You are not left chasing a certifier or relaying questions between a drafter and an engineer. Plans and engineering are resolved before the price is, which is why the number holds.
Major renovation in progress
What We Handle

Structural work. Engineering. End-to-end.

  1. Structural reconfiguration — walls, openings, flow

  2. Single and multi-storey extensions

  3. Genuine added floor area, not just a refresh

  4. Council approvals managed for you

  5. Integrated trades — one point of contact

  6. Quality finishes that match the original home

How it works

Five steps, no surprises.

  1. First chat & site look

    We work out the scope and whether it’s a fit.

  2. Plans & approvals

    Plans reviewed or drawn; we manage the council side.

  3. Detailed quote

    A real number on finished plans, fixed scope.

  4. Build

    Staged, supervised, on the tools — minimal disruption.

  5. Handover

    Finished, certified, and built to last.

See how a project runs
Priced under a regulated contract
  • QBCC: Licence No. 1069118 — statutory warranties on every job
  • MBA: Master Builders Queensland member
  • Owner: Patrick manages every project — the person who quoted it is responsible for it
What It Costs

Straight guidance, before you commit.

Scope drives the number more than anything. Here’s where most of our renovation and extension work sits, and what moves it.

Most major renovations and extensions we take on land between $500k and $900k.

We can’t give you a fixed price without finished plans — and any builder who would, shouldn’t. The range above is honest guidance to help you decide if it’s worth a conversation.

What shapes your number

How much structure changes, the extension footprint (and whether you go up or out), council approvals, site access, and your finishes level. We walk you through all of it before any quote.

How a quote comes together

Builds from Townsville across North and Western Queensland — about 650 kilometres by road along the route shown.

Where we build

Townsville is home. The west is where we grew up.

TownsvilleHome base · est. 1972
via Charters Towers
Hughenden≈ 380 km
Richmond≈ 495 km
Julia Creek≈ 650 km

Distance changes the logistics. Not the standard.

Townsville is home base, but the job has always taken us further — and we've been building out west long enough to know what bites you if you get it wrong. Distances shown are approximate road kilometres from Townsville.

Service areas

Common questions

Renovations & extensions, answered plainly.

  • Only inside a larger structural job. As stand-alone cosmetic work, we're not the right fit — and we'll say so.

  • Most of the structural renovation and extension projects JKC takes on sit between $500k and $900k. The footprint, structural changes, access, approvals and finish level shape where a project lands.

  • Often, depending on scope. Sequencing that properly is part of the planning stage, not an afterthought.

  • Yes, before a fixed quote. If you are earlier than that, JKC can point you to trusted local drafting support so the scope, engineering and approvals are resolved properly.

  • We do. Engineering, certification and council sit inside the one contract.

Last reviewed

Is this your project?

A JKC renovation makes sense when…

The right fit

  • The change is structural — walls, floors, roofline — not paint and fittings
  • You're adding real floor area, up or out
  • The new work has to tie into the old structure properly
  • You want one builder accountable for the whole result

Not the right fit

  • Kitchen- or bathroom-only refreshes
  • Cosmetic renovations without structural scope

What we'll be honest about: If the job is cosmetic, we're the wrong builder for it — and we'd rather tell you that now than waste your time quoting.

Keep Exploring

More of what we build.

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A completed custom home at golden hour, seen across the lawn

Custom New Homes
The Flinders Discovery Centre — a JKC commercial build

Commercial Building
A completed JKC custom home — the entry, verandah posts and garden at dusk

View Our Work

Start a Project

Ready to rework your home?

Tell us what’s not working and what you’re picturing. We’ll let you know quickly whether it’s a fit.

Start a Project