Home Extensions Brisbane Northside
You’ve outgrown your home, but you don’t want to give up your street, school zone or neighbours. That’s where we come in. James Marsden Builders specialises in home extensions, major internal renovations and bathrooms on Brisbane’s northside, typically on projects between $100,000 and $1,000,000.
We’re a small builder–carpenter team: two builders on the tools and one apprentice. No salespeople, no handballing. Just the people who quote your job, build your job.
More space, better layout, without leaving the suburb you love.
The kinds of extensions we build
We focus on extensions that add real living space and value:
Ground‑floor extensions for larger kitchens, living and dining areas
Second‑storey additions for extra bedrooms, bathrooms and parents’ retreats
Under‑house / downstairs conversions where structure allows
Decks and outdoor living spaces that tie into the main house
From new foundations and framing through to final paint and handover, we take care of the lot under a fixed‑price contract.
Why extend instead of move?
For many northside families, extending makes more sense than selling and buying again:
Stay in the same school catchment and community
Avoid stamp duty, agent fees and moving costs
Customise the layout to how your family actually lives
Add significant value to a home you already like
Our job is to help you work out what’s possible on your block, what it’s likely to cost, and how long it will take.
Why homeowners choose us for extensions
Owner‑led, low volume: We only take on a limited number of projects at a time so we can stay across every detail.
Clear communication: Straight answers on budget, timelines and what’s included. No sugar‑coating.
Quality over shortcuts: We build as if we’re going to live in it – from structure through to finishes.
Waterproofing peace of mind: For bathrooms and wet areas within your extension we use the Wedi waterproofing system, flood‑test showers (and floors where applicable), and back it with a 10‑year manufacturer guarantee.
Kedron Project
Our team extended off the existing rear deck to create a new wellness room and walk‑in robe, tying the addition seamlessly into the original roofline and floor levels. Inside, we completely updated the main bathroom and separate toilet, including new fixtures, tiling and waterproofing using our Wedi system with full flood testing. The result is a much more functional master suite and upgraded wet areas, without the clients needing to move or change the character of their Kedron home.
Timeframe
10 Weeks
Year
2025