James P.
Hillarys, WA
Added master suite + 2 bedrooms for $285K in Hillarys. Project took 7 months. The Wombat™ connected us with 3 great local builders - saved $40K by comparing quotes. Added $380K to home value!
Full Second Storey Addition
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Single Room Additions, Standard Extensions & Full Builds
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$172,500-$460,000
Hillarys Price Range
Average extension cost
60-80%
ROI in Hillarys
Property value added
4-7 Months
Typical Timeline
Including approvals
15-25%
Average Savings
By comparing quotes
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Second Storey Extension Costs Hillarys 2026
Complete pricing guide for all extension types and budgets
3 min read
Quick Answer
Family second storey extensions in Hillarys typically cost $207,000-$437,000 for standard suburban builds. Typical additions include 2-3 bedrooms, main bathroom, and built-in robes. Master suite with ensuite and walk-in robe starts from $149,500-$230,000. Family-focused designs prioritize bedroom separation and practical storage.
Updated January 2026
24,500+ Australians served
Hillarys, 6025
1
Standard Suburban DA: In Hillarys typically takes 6-10 weeks with straightforward approval for compliant designs
2
Foundation Reinforcement: For typical Hillarys brick homes costs $17,250-$40,250 depending on existing footings
3
Bedroom Configurations: Most Hillarys families add 2-3 bedrooms upstairs, keeping living areas on ground floor for practicality
4
Master Suite Separation: From children's bedrooms is a popular design choice for privacy in Hillarys family homes
5
Home Office Additions: Increasingly popular in Hillarys extensions - a dedicated study adds $15,000-$25,000 to scope
6
ROI in Suburban Hillarys: Averages 70-85%, with best returns for adding bedrooms to 3-bed homes in family-focused areas
Price Comparison
Second Storey Extension Costs: Hillarys Component Breakdown
Comprehensive pricing for all extension components
Component-by-Component Pricing Guide
| Component | Budget Range | Premium Range |
|---|---|---|
| Structural Engineering | $3,450-$6,900 | $9,200-$17,250 |
| Foundation Reinforcement | $17,250-$34,500 | $40,250-$69,000 |
| Staircase Installation | $9,200-$17,250 | $23,000-$46,000 |
| DA & Approvals | $5,750-$11,500 | $13,800-$23,000 |
*Prices include all materials, labour, and installation for Hillarys. Costs vary by site complexity, material selections, and local market conditions. Timeline: 16-28 weeks from DA approval to completion.
Hillarys Extension Specialists
Why Add a Second Storey to Your Hillarys Home?
Looking for second-storey extension builders near you in Hillarys? The Wombat™ connects Hillarys residents with licensed builders throughout the Greater Perth region.
Family Second-Storey Extensions in Hillarys: Suburban second-storey extensions add valuable bedrooms and living space for growing families. Larger blocks often allow ground-floor extensions, but second storeys maximize land use and add premium value. Common projects include 3-4 additional bedrooms with ensuites, teenage retreats, home offices with views, or parents' retreats. Easier access for construction materials and equipment. Focus on cost-effective designs, energy efficiency, and strong ROI for family homes. Our Hillarys builders provide cost-effective solutions for growing families.
All builders in our Hillarys network are fully licensed, understand Perth council regulations, and provide structural engineering coordination.
2026 Pricing Guide
How Much Does a Second Storey Extension Cost in Hillarys?
Complete 2026 pricing guide for all extension types and budgets in Hillarys
Single Room Addition
Entry LevelPerfect for adding a master bedroom or guest suite with ensuite bathroom
30-50m² Ensuite Walk-in robe
$92K-$173K
3-4 months
MOST POPULAR
Two Room Addition
Ideal for growing families needing extra bedrooms, bathroom, and optional balcony
60-80m² 2 bedrooms Bathroom Optional balcony
$173K-$288K
4-6 months
Large Second Storey
PremiumComprehensive addition with master suite, multiple rooms, 2 bathrooms, and balcony
90-120m² 3+ rooms 2 bathrooms Walk-in robe
$288K-$460K
6-9 months
Full Second Storey
ULTIMATEComplete second floor that doubles your home's living space with 4-5 bedrooms, living retreat, and terrace
Doubles home 4-5 bedrooms Living retreat Terrace
$460K-$920K+
9-12+ months
Calculator
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Structural Stairs Plumbing Electrical Roofing Finishes
Estimated Cost
$253,000 - $310,500
Prices for Hillarys area
This is an estimate only
Actual costs vary based on your specific requirements, site conditions, and chosen finishes
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Competitive Rates
Decision Guide
Second Storey Extension vs Knock-Down Rebuild: Which is Better for Hillarys?
Quick guide to determine the best approach for your Hillarys property
Choose Extension
Sound structure
Strong foundation
Love your location
Stay during build
Cost <60% rebuild
Single room to full second storey additions
Choose Rebuild
Major structural issues
Weak foundation
Want modern efficiency
Layout unusable
Cost >75% rebuild
Complete demolition and new two-storey build
Get a structural assessment first ($2K-$6K)
Reveals your home's capacity and required reinforcement - can change the extension vs rebuild calculation
Hillarys Extension Process
What's Included in Your Hillarys Second Storey Extension
Every phase handled by licensed Hillarys professionals from start to finish
Design & Planning
Phase 1Architectural design with 3D renders, structural engineering, and council DA preparation.
3D renders Engineering DA submission
Structural Work
Phase 2Foundation reinforcement, steel beams, and wall reinforcement for upper level support.
Underpinning Steel beams Reinforcement
Framing & Roof
Phase 3Upper level wall framing, new roof structure, and staircase construction.
Wall framing New roof Staircase
Framing & Roofing
Phase 4Timber or steel framing, new roof installation, and weatherproofing.
Wall framing New roof Weatherproofing
Services & Insulation
Phase 5Electrical, plumbing rough-in, HVAC ducting, and insulation installation.
Electrical Plumbing HVAC
Fit-Out & Finishes
Phase 6Plastering, painting, flooring, bathroom tiling, and built-in wardrobes.
Plastering Flooring Bathrooms
Fixtures & Fittings
Phase 7Lighting, bathroom fixtures, door handles, and final hardware installation.
Lighting Tapware Hardware
Completion & Handover
CompleteFinal inspections, occupation certificate, clean-up, and project handover with warranty.
Final inspection OC certificate 6yr warranty
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Local Hillarys Information
Essential details about services in your area
Suburb Details
Suburb Hillarys
Postcode 6025
City Perth
State Western Australia (WA)
Council & Compliance
Local Council Regulation:
Building permit required via local council
All work in Hillarys must comply with Perth council regulations and Western Australia building codes. Our network of professionals are familiar with local requirements.
Design Trends
Popular Second Storey Extension Styles in Hillarys
Trending extension designs across Hillarys homes
Master Retreat
Most PopularPrivate upstairs sanctuary with large ensuite, walk-in robe, and optional balcony
Private ensuite Walk-in robe Balcony
Kids Zone
Family FavouriteMultiple bedrooms upstairs with shared bathroom and rumpus/study area
3-4 bedrooms Shared bathroom Study nook
Complete Upper Level
Premium ChoiceFull second floor with multiple bedrooms, living areas, and outdoor terraces
4+ bedrooms Living retreat Large terrace
Contemporary Design
Modern AppealModern architectural design with flat roof, floor-to-ceiling windows, and smart home features
Flat roof Large windows Smart home
Project Timeline
Second Storey Extension Timeline in Hillarys
Complete construction timeline - what to expect at each stage of your Hillarys build
1 2-4 months
Planning & Design
- • Architect plans & DA approval
- • Structural engineer assessment
- • Finalize contractor & materials
2 2-4 weeks
Structural Work
- • Foundation underpinning
- • Steel beam installation
- • Wall reinforcement
3 3-6 weeks
Framing & Roof
- • Remove existing roof
- • Frame walls & new roof
- • Staircase construction
4 2-3 weeks
Lock-Up Stage
- • Windows & external doors
- • Roof tiles/cladding
- • External weatherproofing
5 3-4 weeks
Services Installation
- • Plumbing & electrical
- • HVAC ducting
- • Insulation & inspections
6 4-8 weeks
Fit-Out & Finishes
- • Plasterboard & painting
- • Bathroom waterproofing
- • Flooring installation
7 1-2 weeks
Completion
- • Final fixtures & fittings
- • Inspections & certificates
- • Project handover
TOTAL TIMELINE
6-12+ Months
Varies by project size & council approval
Premium Materials
Extension Materials & Finishes in Hillarys
Quality materials and expert craftsmanship for your second storey
Structural Systems
Steel frame or timber construction, engineered to Australian standards with options for lightweight cladding or full brick veneer.
Windows & Doors
Double-glazed aluminium or timber windows, sliding doors to balconies, and stacker doors for seamless indoor-outdoor flow.
Interior Finishes
Premium plasterboard, timber or hybrid flooring, quality carpets, custom cabinetry, and designer lighting packages.
Staircase Options
Timber, steel, or floating staircases with glass or timber balustrades. Custom designs to match your home's character.
Verified Hillarys Professionals
Why Choose Local Hillarys Extension Specialists?
Trusted local builders with proven track records in your area
Local Knowledge
Understand Hillarys housing styles and council requirements
Licensed & Insured
WA licensed builders with full insurance coverage
Engineering Expertise
Experienced with structural requirements for Hillarys homes
Competitive Pricing
Compare up to 3 quotes to get the best Hillarys value
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1
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2
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3
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Compare quotes, designs, and structural plans. Choose the best builder and save up to 30% on your second storey extension.
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Verified Reviews
What Hillarys Customers Say about Second Storey Extension
Real second storey extension reviews from verified Hillarys customers
5.0 out of 5
Based on 3 verified reviews
Second Storey Extension reviews in Hillarys. 3 verified customer reviews with 5.0/5 average rating. Real experiences from local customers.
Lisa M.
Hillarys, WA
Single room master suite extension $165K in Hillarys. Builder handled all engineering and Perth council DA approvals seamlessly. Living on-site was more manageable than expected.
Master Suite Addition
Robert K.
Hillarys, WA
2-room addition cost $210K including foundation reinforcement. Our Hillarys builder handled everything professionally. Structural assessment showed we needed extra work but it was all included. No surprises!
Two Room Extension
5.0/5 Average Rating 3 Customer Reviews Wombat™ Verified Hillarys Area Second Storey Extension
Expert Resources
Expert Second Storey Extension Guides for Hillarys
Free guides from The Wombat™ to help you plan your Hillarys second storey extension
Second Storey Extension Cost Guide 2026
Detailed pricing by size, location, and structural requirements
Read GuideSecond Storey vs Knockdown Rebuild
Which option is right for your home and budget?
Read GuideHow to Plan a Second Storey Addition
Step-by-step planning guide for your extension project
Read Guide10 Second Storey Mistakes to Avoid
Common errors that can cost you time and money
Read Guide Service Areas
Second Storey Extensions in Nearby Perth Suburbs
Our network of licensed second storey extension specialists services all suburbs across Perth
Fremantle
6160
Subiaco
6008
Joondalup
6027
Mandurah
6210
Cottesloe
6011
Scarborough
6019
Mount Lawley
6050
Leederville
6007
Victoria Park
6100
Applecross
6153
Como
6152
Claremont
6010
Don't see your suburb? Get a quote and we'll connect you with professionals in your area.
Add a Second Storey to Your Hillarys Home: Double Your Living Space
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FAQ
Second Storey Extension FAQs for Hillarys
Second storey extension costs in Hillarys (6025) vary by scope: Single room additions (master bedroom with ensuite) $138,000-$207,000, standard extensions (2-3 bedrooms) $207,000-$322,000, full second storeys $322,000-$575,000+. Get free quotes from Hillarys extension builders to compare.
Yes, all second storey extensions in Hillarys (6025) require Development Application (DA) approval from Perth council. Requirements include architectural drawings, structural engineering plans, site analysis, and shadow diagrams. Some Hillarys properties may qualify for Complying Development. Your builder handles all approvals.
Second storey extension timelines in Hillarys: Planning & DA approval 2-4 months, single room additions 12-16 weeks construction, standard extensions 16-20 weeks, full second storeys 20-28 weeks. Most Hillarys families can remain in their home during construction with proper dust barriers.
Most Hillarys homes can support second storey extensions with proper engineering. A structural engineer will assess your existing foundation, soil conditions, and load requirements. Options include underpinning existing footings or steel beam reinforcement. Engineering assessment is included in your quotes.
Second storey extensions offer excellent value in Hillarys. Benefits include: doubling living space without losing backyard, typically 60-80% ROI on property value, staying in your established Hillarys neighbourhood, and ideal for blocks where ground-level extensions aren't possible. Quality extensions can return 80-100%+ of investment in premium Perth suburbs.
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Planning a Bigger Renovation in Hillarys?
We can help with these complementary services to complete your Hillarys dream home
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Whole-home transformation
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Second Storey
Need more space? Add a second storey to your home. Get quotes from structural engineers and builders.
Maximize living space
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Protect your home investment. Restore and extend the life of your roof with expert roofers.
Protect your investment
Extend roof lifespan
Licensed roofers
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Ready to add a second storey in Hillarys?
Ready to add a second storey in Hillarys?
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Last updated: February 2026
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Australia-wide coverage
Prices are estimates based on market research and may vary by location, project size, site conditions, and specialist. Always get multiple quotes for accurate pricing. Second storey extensions require building permits, engineering approval, and compliance with building codes.