House Extensions Brisbane — Single Storey, Second Storey & Granny Flats

HOUSE EXTENSIONS

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17+ Years Experience
QBCC Licensed Builder
MBA Master Builders QLD

MORE ROOM FOR YOUR LIFE TO HAPPEN

You love the suburb. You love the yard. But the house has hit its limits — a bedroom short, a floor plan that doesn't flow, or a property that needs a granny flat to work properly. Moving isn't the only answer.

We extend homes and build secondary dwellings across Brisbane, managing everything from the first site inspection to the occupation certificate. Drafting, engineering, council approvals, demolition, structure, fit-out — one builder, one point of contact the whole way through. If you're considering managing trades yourself, read about the risks of owner-building first.

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Tomas Farr and team planning a Brisbane house extension Tomas Farr walking a client through a house extension build site, Brisbane
Completed single storey rear extension at Alexandra Hills by Farr Constructions
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Single Storey Extensions

Extend the footprint of your home at ground level — extra bedrooms, a master suite, a larger kitchen and living zone, a dedicated laundry, or a connected indoor-outdoor entertaining space. We manage the full structural process including demolition, slab, framing, roofing, and all trades.

To get a quote, we need a site inspection. A sketch or a brief description of what you want is enough to get us started on-site.

See how this came together at Alexandra Hills — master bedroom, new living space, and full kitchen fitout added to an existing brick home.

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02

Second Storey Additions

Double your living space without touching the yard. Second storey additions are the most significant way to grow a home in a constrained site — full upper level, partial additions, or a master suite above. We assess the structural suitability of your existing slab and frame before quoting, so there are no surprises.

A site inspection is essential for second storey work. We'll walk through what your current structure can carry and design around it.

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Team working on roof deck during second storey addition, Farr Constructions Brisbane
Tomas Farr discussing secondary dwelling plans with a client on site, Brisbane
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Granny Flats & Secondary Dwellings

A granny flat adds a self-contained dwelling to your property — for aging parents, adult kids, or long-term rental income. We build them to council-compliant specifications: fully self-contained with separate entrance, kitchen, bathroom, and living area.

We manage the development application, site works, structure, and all internal trades. A site inspection and your block dimensions get us going.

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04

Kitchen & Living Extensions

The most common extension type in Brisbane — pushing the back of the house out to create an open-plan kitchen, dining, and living space that flows to the outdoors. We tie in the new structure with the existing home, handle all internal renovation work, and integrate the alfresco connection if needed.

A rough idea and a site inspection is all we need to give you an accurate fixed-price quote.

See the South Brisbane sunroom extension — an enclosed verandah converted into a fully liveable year-round space.

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Kitchen fitout in completed house extension, Alexandra Hills by Farr Constructions

The Extension Process

Tom discussing an extension enquiry on the phone
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Ballpark Figure & Phone Brief

Before booking a site visit, Tom works from a mud map or real estate photos and a quick phone discussion to give you a ballpark figure. This way we confirm the project fits your budget before either of us spend half a day walking the block.

Tomas Farr with team during extension framing, Brisbane
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Site Inspection & Estimate

Once the ballpark stacks up, Tom visits your property, assesses what the block and existing structure allow, and tightens up the estimate.

Tradesman measuring floor joists during Brisbane house extension
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Concept & Drafting

We engage a draftsman to draw the approved design. You review and sign off before anything goes to council. The drawings are coordinated by us — you don't need to manage a separate designer.

Steel post framing during Brisbane house extension by Farr Constructions
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Engineering & Survey

Structural engineering is completed to spec the footings, slab, beams, and roof structure. A site survey is completed if required. We co-ordinate both — they're included in your fixed price.

Tradesman working at roof level on Brisbane house extension
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Building Approval

We submit your development application and handle all council correspondence. Approval timelines vary by council and project type — we advise on realistic expectations upfront and manage the process so you don't have to.

Tradesman framing roof deck during Brisbane house extension
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Site Preparation & Demolition

We prepare the site for construction — removing existing structures where required, setting out the new footprint, and completing any earthworks. Demolition is handled carefully to protect the parts of the home you're keeping.

Drilling floor joists during Brisbane house extension substructure
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Substructure & Slab

Footings are dug to engineer's specifications and the concrete slab is poured. This is the foundation everything else relies on. We don't rush this stage — it sets the quality of everything above it.

Framing crew on roof deck during Brisbane house extension lock-up stage
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Framing, Roofing & Lock-Up

Timber framing goes up, the roof is installed, windows and external doors are set. At lock-up the new structure is weather-tight and secure — a significant milestone for any extension project.

Carpenter using mitre saw during Brisbane house extension fit-out
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Internal Fit-Out

Plumbing, electrical, insulation, plasterboard, tiling, cabinetry, painting, and all finishing trades are completed in sequence. Tom personally manages every inspection and every trade — you get one point of contact, not a juggling act.

Aerial view of completed house extension, Alexandra Hills by Farr Constructions
10

Handover & Occupation Certificate

A full walk-through with Tom, defects addressed, and your occupation certificate issued. We stay available after handover — if something needs attention in the warranty period, we're a phone call away.

House Extension FAQs

Yes — any change to the footprint of your home requires building approval, and most require a development application through Brisbane City Council. Farr manages the full DA + building approval process including engineering, drafting and certifier liaison.

Single-storey extensions usually run 4–6 months from contract signing to handover. Second-storey additions and granny flats are 5–8 months. Council approval timelines vary — Tomas advises on realistic expectations upfront.

In most cases yes — but a site inspection is essential. Tomas assesses your existing slab, frame and footings to confirm what structure can carry the new upper level. Some homes need structural reinforcement; some need a partial rebuild. We're upfront before any contract is signed.

Yes, secondary dwellings (granny flats) are permitted under Brisbane City Council's planning scheme subject to size, setback and amenity requirements. Farr manages the DA and ensures the design complies with current council rules.

Yes — Brisbane City Council permits secondary dwellings to be rented to third parties (not just family members), provided the design meets the current planning scheme. Always check the most recent council rules before banking on rental income.

House extensions in Brisbane start at $130,000+GST and run to $400,000+GST and beyond — the bigger and more complex the project, the higher the range.

Tomas provides a ballpark figure off a mud map or phone discussion first, then a fixed-price quote after the site visit. No provisional sums, no surprises.

Yes — every extension includes demolition (where required), site preparation and earthworks as part of the build. We protect the parts of your home you're keeping and coordinate skip bins, site fencing and trade access.

We extend homes across Brisbane — Paddington, Bardon, Red Hill, Ashgrove, Newmarket, New Farm, Bulimba, Hawthorne, Coorparoo, Tarragindi, Camp Hill, Toowong, Kenmore, Chapel Hill and surrounds.

Brisbane suburbs we build extensions in

We extend homes across Brisbane — character Queenslanders that need a second storey, post-war homes that need a footprint expansion, and family properties ready for a granny flat. From Paddington and Bardon to Coorparoo, Tarragindi and Bulimba.

Ready To Add More Space?

A site inspection is the first step. Call Tom today and we'll assess your property and give you an honest fixed-price quote.

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