Outgrowing your home doesn’t have to mean leaving the street you love. For most Brisbane families, a well-planned extension solves the space problem while keeping everything else that made you buy the house in the first place: the neighbourhood, the school catchment, the garden you’ve spent years on.

The difference between an extension that feels like it was always there and one that feels bolted on comes down to how it’s planned and built. At RedKem Constructions, we treat every extension as an extension of the building, not just the floor plan, thinking about how the new structure performs alongside the old one, not just how it looks.

Why the Build Quality of an Extension Matters More Than People Expect

An extension isn’t a standalone project. It has to tie into your existing roofline, structure, insulation, and airflow, and that junction between old and new is where most problems show up later: draughts, condensation, mismatched thermal performance, rooms that never quite feel as comfortable as the rest of the house.

RedKem Constructions is a GreenSmart Professional accredited builder, which means every extension we build is considered through the lens of building science: how the thermal envelope performs, how air moves through the home, and how the join between old and new construction is sealed and insulated. It’s the difference between an extension that just adds square metres and one that actually improves how your whole home feels to live in.

Types of Home Extensions We Build

Every family uses space differently, so there’s no single right answer. Depending on your block, budget, and how your household actually lives day to day, that might look like:

  • Single-storey extensions – additional bedrooms, larger living areas, or an expanded kitchen and dining space
  • Second-storey additions – adding a full new level when your footprint can’t grow outward
  • Rear and side extensions – making use of underused outdoor or side-yard space
  • Kitchen and living extensions – open, connected living designed around how families actually spend time together
  • House raise and build under – lifting an existing home to create a new level underneath, popular across Brisbane’s older Queenslanders and post-war homes

We’ve built extension and second-storey projects across Tingalpa and the surrounding 40-minute radius, including HIA Award-winning renovation and addition work. You can see examples of that recognised work at HIA Award-winning renovation and addition work.

A Process Built Around Certainty, Not Surprises

Extension projects have a reputation for blowing out on price and timeline. We built our process specifically to remove that risk:

  1. First consultation – we assess your existing structure on site and talk through what you actually need, then give you an early price indication
  2. Concept design – if you don’t already have plans, our building designer develops a concept around your home and your brief
  3. Fixed-price contract – once the design and selections are locked in, your price doesn’t move. No surprise variations for scope you didn’t ask for
  4. Online client access – 24/7 visibility into your budget, schedule, selections, and approvals, from your phone or the office, wherever you are
  5. Construction – our site team, led by Project Manager Craig Minty (over 10 years with RedKem), keeps the build on schedule and keeps you informed
  6. Handover – complete with your 6.5-year structural warranty and 12-month maintenance warranty

Every client also has our 24-hour response guarantee behind them. If you email or call with a question, you’ll hear back within a day, not a week.

Extending an Older Brisbane Home

A lot of the extension work we do involves character homes, Queenslanders and post-war cottages where the owners want more space without losing what makes the original home worth keeping. That’s a different job to extending a project home: matching materials, working around existing framing, and making sure the new build doesn’t outperform (or underperform) the old one thermally.

Getting that balance right is exactly where our building science background matters. It’s not just about matching the weatherboards; it’s about making sure the whole house, old and new, works as one consistent, comfortable, energy-efficient building once the extension is finished.

Why Brisbane Homeowners Choose RedKem for Their Extension

  • 14 years and multiple HIA and Master Builders Queensland awards, including three consecutive years as HIA-CSR Small Building Company of the Year
  • GreenSmart Professional accredited, with a genuine building science approach to thermal performance and comfort
  • Fixed-price contracts with no hidden extras
  • 24-hour response guarantee and a defect-free handover guarantee
  • 6.5-year structural warranty plus 12-month maintenance warranty
  • 24/7 online client access so you always know where your project and budget stand

Don’t just take our word for it. As one recent client told us:

“The team’s professionalism, craftsmanship, and meticulous attention to detail has given us a truly quality product, which they can all rightly be proud of. We are extremely happy with the result, and have no hesitation in recommending RedKem for any building project.”

Start Planning Your Extension

If your current home has the location and the bones you want, you probably don’t need to move. You need to extend it properly.

Get in touch with RedKem Constructions to arrange your first consultation, or view our full proposal package.

RedKem Constructions Pty Ltd QBCC Licence No. 127 89 92 0423 478 262 | jared@redkem.com.au | redkem.com.au

 

Frequently Asked Questions.

A good extension builder plans and constructs additional living space that integrates structurally, aesthetically, and thermally with your existing home; not just a new room stuck on the side. RedKem handles everything from concept design through to council approval, construction, and handover.

It depends on the size, design, materials, and site conditions, particularly how much work is needed to tie the extension into your existing structure. RedKem’s typical project range is $300,000 to $1.2 million, and we provide a fixed-price contract once your design and selections are finalised, so there are no surprises later.

For many Brisbane families, extending is the more practical option: you keep your street, your school catchment, and your equity, while gaining the space you need. The right call depends on your block, your budget, and how much potential your current home has.

Yes, this is a significant part of our work. Matching character while improving thermal performance and comfort is exactly where our building science approach adds the most value.

Every project comes with a 6.5-year structural warranty and a 12-month maintenance warranty, backed by our defect-free handover guarante.