Licensed Extension Builders

Compare Second Storey Extension Quotes in Sunshine Coast

Single Room Additions, Standard Extensions & Full Builds in Sunshine Coast

Compare free quotes from licensed second storey extension builders across Sunshine Coast. Whether you're adding a master retreat, extra bedrooms, or a complete upper level, get up to 3 competitive quotes from verified professionals.

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$165,000-$440,000
Sunshine Coast Price Range
Average extension cost
60-80%
ROI in Sunshine Coast
Property value added
4-7 Months
Typical Timeline
Including approvals
15-25%
Average Savings
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Second Storey Extension Costs Sunshine Coast 2026

Complete pricing guide for all extension types and budgets

3 min read

Quick Answer

Second storey extensions in Sunshine Coast typically cost $198,000 to $495,000 depending on size and complexity. Single room additions (master suite with ensuite) start from $132,000-$198,000, standard 60-80m² extensions cost $220,000-$385,000, while full upper levels exceeding 100m² with premium finishes can reach $550,000-$880,000. Building upward costs approximately $2,750-$4,950 per m² compared to $1,980-$3,300/m² for ground floor additions. Timeline is 16-28 weeks from DA approval to completion.

Updated January 2026 24,500+ Australians served
1

Structural Engineering: Mandatory assessment of existing foundations and walls to determine load-bearing capacity. Budget $3,300-$13,200 for engineering reports and design

2

Foundation Reinforcement: Required in 70%+ of projects - underpinning or steel pier installation typically costs $16,500-$66,000 depending on existing structure

3

Development Application (DA): Required in most Sunshine Coast councils - fees, architectural drawings, and town planner cost $5,500-$22,000. Timeline 6-12 weeks depending on council complexity

4

Staircase Installation: Costs $8,800-$38,500 depending on design - straight timber flights are cheapest, curved or steel feature stairs most expensive

5

ROI & Property Value: Second storey extensions in Sunshine Coast average 70-90% return, with best returns in high-demand suburbs with limited land availability

6

Local Market Insights: Sunshine Coast extensions benefit from Sunshine Coast's strong property market. Compare multiple quotes to ensure competitive pricing and quality workmanship

Price Comparison

Second Storey Extension Cost Guide Sunshine Coast 2026

Comprehensive pricing for all extension types

Second Storey Extension Price Guide - By Size & Scope

Extension Type Price Range What's Included
Single Room (40-50m²)
 $132,000-$198,000 Master bedroom, ensuite, walk-in robe, internal staircase, structural engineering, DA approvals, standard finishes
Standard (60-80m²)
 $220,000-$385,000 2-3 bedrooms, main bathroom, built-in robes, internal staircase, foundation reinforcement, mid-range finishes
Large (100-120m²)
 $385,000-$605,000 3-4 bedrooms, 2 bathrooms, rumpus/study, balcony, premium staircase, high-end finishes throughout
Premium (150m²+)
 $605,000-$880,000+ Full upper level with master retreat, multiple living areas, multiple balconies, architect-designed, luxury finishes
*Prices include all materials, labour, and installation for Sunshine Coast. Costs vary by location, extension size, and material selections. Timeline: 16-28 weeks from DA approval to completion.
Sunshine Coast Extension Specialists

Second Storey Extension Services in Sunshine Coast

Add valuable living space to your Sunshine Coast home with a professionally designed and built second storey extension. Our network of verified builders specializes in upward extensions, from single master retreats to complete upper levels.

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Second storey home extension in Sunshine Coast

Second Storey Extension Cost Sunshine Coast 2026

Sunshine Coast second storey extensions offer excellent value, allowing you to expand upward on smaller blocks without sacrificing outdoor space. Compare quotes from verified local builders.

Structural engineering DA management Premium finishes
$165,000-$440,000
Sunshine Coast average range
2026 Pricing Guide

How Much Does a Second Storey Extension Cost in Sunshine Coast?

Complete 2026 pricing guide for all extension types and budgets in Sunshine Coast

Single Room Addition

Entry Level

Perfect for adding a master bedroom or guest suite with ensuite bathroom

30-50m² Ensuite Walk-in robe
$88K-$165K
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
$165K-$275K
4-6 months

Large Second Storey

Premium

Comprehensive addition with master suite, multiple rooms, 2 bathrooms, and balcony

90-120m² 3+ rooms 2 bathrooms Walk-in robe
$275K-$440K
6-9 months

Full Second Storey

ULTIMATE

Complete 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
$440K-$880K+
9-12+ months
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Calculator

Second Storey Extension Cost Calculator Sunshine Coast

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Structural Stairs Plumbing Electrical Roofing Finishes

Estimated Cost

$242,000 - $297,000

Add 15-20% for Sydney/Melbourne

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Actual costs vary based on your specific requirements, site conditions, and chosen finishes

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Critical First Step

Second Storey Extension Structural Assessment in Sunshine Coast

What engineers check before any Sunshine Coast second storey extension

1

Foundation Check

Can footings bear additional weight without settling

2

Load-Bearing Walls

Which walls can support second storey loads

3

Soil Stability

Ground composition and drainage conditions

4

Existing Issues

Cracks, movement, previous repairs

Common Reinforcement Costs

$11K-$22K
Foundation underpinning
$9K-$17K
Steel beam installation
$6K-$13K
Wall bracing
$17K-$33K+
Extensive work

Assessment Cost Guide

$2-$3K
Basic report
$3-$4K
Detailed
$4-$6K+
Complex

Avoids costly surprises during construction

Warning Signs Your Sunshine Coast Home May Need Extra Work

Wall/ceiling cracks Uneven floors Sticking doors/windows Built pre-1980 Sloping/reactive soil Previous issues
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Sunshine Coast Extension Process

What's Included in Your Sunshine Coast Second Storey Extension

Every phase handled by licensed Sunshine Coast professionals from start to finish

Design & Planning

Phase 1

Architectural design with 3D renders, structural engineering, and council DA preparation.

3D renders Engineering DA submission

Structural Work

Phase 2

Foundation reinforcement, steel beams, and wall reinforcement for upper level support.

Underpinning Steel beams Reinforcement

Framing & Roof

Phase 3

Upper level wall framing, new roof structure, and staircase construction.

Wall framing New roof Staircase

Framing & Roofing

Phase 4

Timber or steel framing, new roof installation, and weatherproofing.

Wall framing New roof Weatherproofing

Services & Insulation

Phase 5

Electrical, plumbing rough-in, HVAC ducting, and insulation installation.

Electrical Plumbing HVAC

Fit-Out & Finishes

Phase 6

Plastering, painting, flooring, bathroom tiling, and built-in wardrobes.

Plastering Flooring Bathrooms

Fixtures & Fittings

Phase 7

Lighting, bathroom fixtures, door handles, and final hardware installation.

Lighting Tapware Hardware

Completion & Handover

Complete

Final inspections, occupation certificate, clean-up, and project handover with warranty.

Final inspection OC certificate 6yr warranty
All trades coordinated by your Sunshine Coast project manager | Get a Full Quote
Design Trends

Popular Second Storey Extension Styles in Sunshine Coast

Trending extension designs across Sunshine Coast suburbs

Master Retreat

Most Popular

Private upstairs sanctuary with large ensuite, walk-in robe, and optional balcony

Private ensuite Walk-in robe Balcony

Kids Zone

Family Favourite

Multiple bedrooms upstairs with shared bathroom and rumpus/study area

3-4 bedrooms Shared bathroom Study nook

Complete Upper Level

Premium Choice

Full second floor with multiple bedrooms, living areas, and outdoor terraces

4+ bedrooms Living retreat Large terrace

Contemporary Design

Modern Appeal

Modern architectural design with flat roof, floor-to-ceiling windows, and smart home features

Flat roof Large windows Smart home
Decision Guide

Second Storey Extension vs Knock-Down Rebuild: Which is Better for Sunshine Coast?

Quick guide to determine the best approach for your Sunshine Coast property

Choose Extension

$88K-$880K
Sound structure Strong foundation Love your location Stay during build Cost <60% rebuild

Single room to full second storey additions

Choose Rebuild

$440K-$1320K+
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

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Project Timeline

Second Storey Extension Timeline in Sunshine Coast

Complete construction timeline - what to expect at each stage of your Sunshine Coast 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 Sunshine Coast

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 Sunshine Coast Professionals

Why Choose Local Sunshine Coast Extension Specialists?

Trusted local builders with proven track records in your area

Local Knowledge

Understand Sunshine Coast housing styles and council requirements

Licensed & Insured

QLD licensed builders with full insurance coverage

Engineering Expertise

Experienced with structural requirements for Sunshine Coast homes

Competitive Pricing

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1

Tell Us What You Need

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2

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3

Choose & Save

Compare quotes, designs, and structural plans. Choose the best builder and save up to 30% on your second storey extension.

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Average savings by comparing multiple quotes in Sunshine Coast

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2-Room Extension - Sunshine Coast Yesterday

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Verified Reviews

What Sunshine Coast Customers Say about Second Storey Extension

Real second storey extension reviews from verified Sunshine Coast customers

5.0 out of 5
Based on 3 verified reviews

Second Storey Extension reviews in Sunshine Coast. 3 verified customer reviews with 5.0/5 average rating. Real experiences from local customers.

James P.

Sunshine Coast, QLD

Verified

Added master suite + 2 bedrooms for $285K in Sunshine Coast. Project took 7 months. The Wombat™ connected us with 3 great builders - saved $40K by comparing quotes. Added $380K to home value!

Full Second Storey Addition

Lisa M.

Sunshine Coast, QLD

Verified

Single room master suite extension $165K in Sunshine Coast. Builder handled all engineering and council DA approvals seamlessly. Living on-site during construction was more manageable than expected.

Master Suite Addition

Robert K.

Sunshine Coast, QLD

Verified

2-room addition cost $210K including foundation reinforcement. Structural assessment showed we needed extra work but our Sunshine Coast builder included it in the quote. No surprises!

Two Room Extension
5.0/5 Average Rating 3 Customer Reviews Wombat™ Verified Sunshine Coast Area Second Storey Extension

Expert Resources

Expert Second Storey Extension Guides for Sunshine Coast

Free guides from The Wombat™ to help you plan your Sunshine Coast second storey extension

Second Storey Extension Cost Guide 2026

Detailed pricing by size, location, and structural requirements

Read Guide

Second Storey vs Knockdown Rebuild

Which option is right for your home and budget?

Read Guide

How to Plan a Second Storey Addition

Step-by-step planning guide for your extension project

Read Guide

10 Second Storey Mistakes to Avoid

Common errors that can cost you time and money

Read Guide
View All Guides
Service Areas

Find Second Storey Extension Builders Near You in Sunshine Coast

We connect you with verified extension builders servicing all suburbs across Sunshine Coast

Noosa Heads
4567
Maroochydore
4558
Mooloolaba
4557
Caloundra
4551
Coolum Beach
4573
Alexandra Headland
4572
Buderim
4556
Kawana
4701
Nambour
4560
Peregian Beach
4573
Sippy Downs
4556
Bli Bli
4560
Marcoola
4564
Kawana Waters
4575
Birtinya
4575

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FAQ

Second Storey Extension FAQs for Sunshine Coast

Second storey extension costs in Sunshine Coast vary by scope: Single room additions (master bedroom with ensuite) $132,000-$198,000, standard extensions (2-3 bedrooms) $198,000-$308,000, full second storeys $308,000-$550,000+. Key cost factors include structural requirements (existing foundation capacity), size of addition, quality of finishes, staircase design, and council requirements. Labour rates in Sunshine Coast average $88-$165/hour for specialist trades. Compare multiple quotes to ensure competitive Sunshine Coast pricing.
Yes, all second storey extensions in Sunshine Coast require Development Application (DA) approval from your local council. Requirements include: architectural drawings, structural engineering plans, site analysis, shadow diagrams showing impact on neighbours, and compliance with local planning controls (height limits, setbacks, floor space ratios). Some Sunshine Coast councils offer complying development paths for certain extensions. Heritage areas have additional restrictions. Budget 8-16 weeks for DA approval. Private certifiers can sometimes accelerate the process. Your builder should manage the entire approval process.
Second storey extension timelines in Sunshine Coast: Planning & DA approval 2-4 months (designs, engineering, council submission), single room additions 12-16 weeks construction, standard extensions 16-20 weeks, full second storeys 20-28 weeks. Add 4-8 weeks for custom finishes or complex structural work. Weather delays can extend timelines, particularly in Sunshine Coast's wet season. Most families remain living in the home during construction with proper dust barriers and staged work. Temporary relocation may be needed during roof removal (usually 2-4 weeks).
Most Sunshine Coast homes can support second storey extensions with proper engineering. A structural engineer will assess: (1) Existing foundation type and condition, (2) Soil conditions and bearing capacity, (3) Load requirements for proposed extension, (4) Required reinforcement works. Options include: underpinning existing footings ($33,000-$88,000), steel beam reinforcement, or load transfer systems. Post-war brick homes typically need more work than modern slab construction. Engineering assessment costs $2,200-$5,500 and is essential before quoting.
A complete Sunshine Coast second storey extension typically includes: (1) Architectural design with 3D renders, (2) Structural engineering and certification, (3) DA/CDC approval management, (4) Foundation reinforcement if required, (5) Steel framing or timber construction, (6) Complete roof rebuild, (7) Internal staircase with balustrade, (8) Electrical and plumbing rough-in, (9) Insulation and sarking, (10) Plastering and painting, (11) Flooring installation, (12) Bathroom fit-out (if applicable), (13) Built-in wardrobes, (14) External weatherproofing, (15) Final inspections and certification. Quality contractors provide detailed quotes showing all inclusions.
Second storey extensions offer excellent value in Sunshine Coast's property market. Benefits: (1) Double your living space without losing backyard, (2) Typically adds 60-80% of cost to property value, (3) Often cheaper than buying larger home (avoid stamp duty, agent fees), (4) Stay in established neighbourhood and schools, (5) Ideal for small blocks where side/rear extensions aren't possible. In premium Sunshine Coast suburbs, quality extensions can return 80-100%+ of investment. Master suite additions are particularly valuable for resale appeal.
Verify Sunshine Coast extension builder credentials: (1) Check state building licence for structural work, (2) Confirm public liability insurance ($20 million minimum), (3) Verify home warranty insurance, (4) Review portfolio of completed second storey extensions (not just renovations), (5) Check references from similar Sunshine Coast homes, (6) Verify relationships with structural engineers and architects, (7) Confirm experience with Sunshine Coast council DA processes, (8) Review detailed quotes with engineering specifications, (9) Check completion timelines and project management approach, (10) Assess communication style and responsiveness. The Wombat™ pre-vets all extension builders for compliance and specialist experience.
Most Sunshine Coast families live in their home during second storey extensions with proper planning. Considerations: (1) Temporary roof removal phase (2-4 weeks) may require temporary relocation, (2) Dust barriers and plastic sheeting protect living areas, (3) Staged construction minimizes disruption, (4) Temporary stairs provide access during staircase construction, (5) External scaffolding required throughout, (6) Noise and tradespeople from 7am weekdays. Some families stay with relatives during roof removal phase only. Builders should provide detailed construction schedule showing disruption periods.

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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.

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