Home Extensions Perth
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Home Extensions Perth — More Space, Same Street
House & Co builds home extensions across Perth from $80,000 — single-storey, second-storey,
granny flats and room additions, all with full permit management and every licensed trade under one
agreement.
3D design before any slab is poured. Fixed-scope quote. The same team that quotes your extension
manages it from permit lodgement to final handover. 4.9★ rated on Google and Facebook.
- Permit management included — we lodge and manage council approval, you do not deal with the council
- 3D design before any slab is poured — see roofline, floor plan and finishes first
- All licensed trades under one agreement — builder, plumber, electrician, tiler, painter
- Fixed-scope quotes — the price you sign is the price you pay
- Combine with kitchen or bathroom renovation — trades already on site, reduced mobilisation cost
Why Perth Homeowners Choose House & Co
★★★★★
4.9 Google & Facebook
Real reviews from Perth homeowners
Licensed & Insured
All trades hold relevant WA licences
3D Design Included
See it before a single tile is ordered
Fixed-Scope Quotes
The price you sign is the price you pay
Perth Owned & Operated
Not a franchise local team, local knowledge
What's Included in Your Home Extension
A home extension is the most comprehensive renovation scope House & Co manages. Every element
is coordinated under one agreement.
Design, permits & planning
- 3D architectural design — see the finished extension before any work begins
- Building permit application management — lodged with your local Perth council
- Structural engineering report — coordinated as part of the permit process
- Energy efficiency assessment — required for all new WA residential construction
Construction
- Demolition and preparation of existing structure
- Concrete slab or suspended floor — whichever suits the site conditions
- Framing, wall sheeting, and roof structure
- Roofing — Colorbond, tile, or flat roof to match or complement existing home
- Windows and external doors — supply and install
Fit-out & finishing
- Internal wall sheeting, cornice, and painting
- Flooring — timber, tile, or carpet to match existing home
- Electrical — power points, lighting, air conditioning wiring by licensed electrician
- Plumbing — if adding a bathroom, laundry, or kitchen to the extension
- Cabinetry and joinery if the extension includes kitchen, bathroom, or laundry
- Final finishing, cleaning, and practical completion inspection
Why Perth Homeowners Choose House & Co for Extensions
One company from permit to handover
A home extension involves more stages than any other renovation — design, permits, structural
engineering, construction, fit-out. House & Co manages all of it under one agreement. You have one
contact from the first consultation to the day you receive the keys to your new space.
3D design before any commitment
Before a permit is lodged or a slab is poured, you see your new extension in 3D — the roofline, the
floor plan, the internal finishes, and how it connects to your existing home. Revisions at design stage
are included. Changes during construction are expensive.
Permit management — you do not deal with the council
House & Co manages the full permit process — application, structural engineering, energy efficiency
assessment, and council liaison. Most residential extension permits in Perth take 6–12 weeks. We
lodge, track, and manage the process entirely.
Combining extension and renovation — maximum efficiency
Many Perth homeowners add a bathroom or kitchen renovation to the same project as an extension.
Trades are already on site, sequencing is managed across all rooms simultaneously, and the
combined project often costs less than two separate projects booked months apart.
Home Extension Cost in Perth
Home extensions start from $80,000 and can reach $200,000+ for large or complex additions. Cost
depends on the size of the extension, structural complexity, materials, and whether a bathroom,
kitchen, or laundry is included in the new space.
| Tier | Price Range | What's Included |
|---|---|---|
| Single-storey room addition | $80,000 – $120,000 | 1–2 room addition to existing footprint. Permit required. |
| Single-storey rear extension | $100,000 – $160,000 | Larger addition including living areas or open plan. Full permit and engineering. |
| Granny flat addition | $120,000 – $180,000 | Self-contained dwelling on existing lot. Planning and building permits required. |
| Second-storey addition | $150,000 – $250,000+ | Full upper level. Structural engineering, planning approval, and full fit-out. |
All prices are guides for typical Perth residential projects as at March 2026. Fixed-scope quotes are
provided after in-home consultation and 3D design approval.
Our Home Extension Process
Step 1 — Free in-home consultation
We assess the site, understand the brief — size of extension, number of rooms, finishes, whether a
bathroom or kitchen is included — and discuss feasibility and indicative budget.
Step 2 — 3D design
Your extension is designed in 3D — floor plan, roofline, internal finishes, and connection to the
existing home. Revisions included until the design is right.
Step 3 — Fixed-scope quote
Once the design is approved, a fixed-scope quote is issued covering all stages — permits,
construction, fit-out, and finishing. The price you sign is the price you pay.
Step 4 — Permit lodgement and approval
We lodge the building permit application with your local Perth council. Most residential extension
permits take 6–12 weeks. We manage the process — you receive updates, not council paperwork.
Step 5 — Construction and fit-out
On-site construction begins on permit approval. Slab, frame, roof, external, then internal fit-out. Every
licensed trade coordinated in the correct sequence.
Step 6 — Practical completion and handover
Final inspection with council if required. Complete walkthrough together. Not finished until every item
is ticked off and the space is ready to use.
Trusted by Homeowners Across Perth
I have just had a full bathroom renovation and new floors throughout my whole house and I can ‘t thanks Sam and his team enough, it looks amazing 🥰 if you are looking for a company for any home renovations I would highly recommend House & Co ⭐️
Vicki Gardiner
Bathroom Renovation
Awesome job recently conpleted of our Main Bathroom & Ensuite.Whilst we had one issue it was resolved in a timely manner.Thanks Sam
Leanne White
Bathroom Renovation
House & Co went above & beyond to renovate my home. Sam & Mirv understood my needs and exceeded my expectations under very challenging time constraints & circumstances. Efficient, reliable & exceptional service. Thank you both & to the whole team- Highly recommend! 🤩🏡
Amanda Rowe
Home Renovation
Just had Sam come and seal my shower , prompt n professional and well priced …. Plus a 20 year guarantee ….. win , win …. Thanks Sam .🤘🏿😉
Chad MacKenzie
Bathroom Renovation
I found Sam to be friendly, courteous and helpful regarding a problem I was having with a renovation. He certainly is the real deal.
Patrick Humberstone
Home Renovation
Perth suburbs we service for Home Extensions
We complete home extensions throughout the Perth metropolitan area.
Subiaco
Cottesloe
Nedlands
Claremont
South Perth
Fremantle
Mount Lawley
Victoria Park
Scarborough
Mosman Park
Dalkeith
Applecross
Como
Leederville
Mount Lawley
Mount Hawthorn
North Perth
Mosman Park
Wembley
Floreat
Mount Pleasant
Canning Vale
Joondanna
Inglewood
Not sure if we cover your suburb? Call us on (08) 9480 0408 — we service all Perth metro areas
Explore more about your Home extension
Home Renovations Perth
Whole-home renovation including extensions and interior work
Bathroom Renovations Perth
Add a bathroom to your extension
Kitchen Renovations Perth
Add a kitchen to your extension project
Renovation Permits Perth
What permits are required for home extensions in Perth
Add Value to Your Perth Home
How extensions affect property value in Perth
FREQUENTLY ASKED QUESTIONS
Frequently Asked Questions
How much does a home extension cost in Perth?
Home extensions in Perth typically start from $80,000 and can reach $200,000+ for large or
complex additions. Cost depends on the size of the extension, the structural complexity, materials
selected, and council permit requirements.
Do I need a building permit for a home extension in Perth?
Yes — all home extensions require a building permit from your local Perth council. House & Co
manages the permit application and any required engineering assessments as part of the project
scope.
How long does a home extension take?
Design and permits: 8–16 weeks. On-site construction: 12–24 weeks depending on scope. Total
from first consultation to completion: 6–12 months for most residential extensions in Perth.
What types of home extensions do you build?
Single-storey rear additions, second-storey additions, granny flat additions, room additions (extra
bedroom, home office, activity room), and garage conversions. Scope discussed at consultation.
Can I combine a home extension with interior renovations?
Yes — and it is often the most efficient approach. Trades are already on site for the extension;
adding a kitchen or bathroom renovation to the same project reduces mobilisation costs and is
managed under one agreement.
Do you manage the building permit for an extension?
Yes — House & Co manages the full permit process, including any required structural engineering
report, energy efficiency assessment, and council submission. You do not need to deal with the
council directly.
How do I get a home extension quote?
Call (08) 9480 0408 or use our contact form. We arrange a free in-home consultation to assess the
site, understand the brief, and discuss feasibility before any design work begins.
Related renovation services in Perth
House & Co manages every room under one agreement. Browse our other services below — all
spokes connect back to the same team, the same process, and the same fixed-scope quote.
Bathroom Renovations Perth
From $25,000
House & Co delivers bathroom renovations across Perth from $25,000 — fully coordinated, all
licensed trades included.
Kitchen Renovations Perth
From $30,000
House & Co delivers kitchen renovations across Perth exact dimensions, stone benchtops, and all licensed trades under one agreement.
Ensuite Renovations Perth
From $20,000
House & Co delivers Ensuite renovations across Perth
as our main bathroom renovations, applied to the space that starts and ends your day.
Laundry Renovations Perth
From $20,000
House & Co laundry renovations include custom ceiling-height cabinetry, new
floor and wall tiling, sink and tapware.
Alfresco Renovations Perth
From $15,000
Perth’s climate makes the alfresco one of the most-used spaces in any home. House & Co renovates
alfresco areas across Perth
Ready to start your renovation?
Book a free in-home consultation — (08) 9480 0408