Plan Your House Extension Project Like a Pro. Start Free on AIreno.
Calculate your House Extension costs instantly with our free smart calculator, planning checklists, and expert project support — everything you need to get started right.
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Popular House Extension Services
Rear Home Extensions
Garage Conversions
Extension Design & Approval
Heritage Home Extensions
Budget Home Expansions
Ground Floor Extensions
Second Storey Additions
Attic Conversions
Instant, accurate pricing — skip the sales calls and get real renovation costs upfront
Built-in planning help — AIreno Planners guide every step, free of charge
Checklists, calculators, tools — smarter decisions, fewer mistakes
AI-powered quoting for tradies — no spreadsheets, no back and forth
Everything in one place, online — from quote to handover
How it Works
Plan First
Find real costs, plan your steps, and get clear answers. Start smart with free tools built specifically for renovating.
Get Ready Smart
Lock in your instant quote and build your plan with help from an AIreno Planner. Everything scoped and ready, before you commit.
Get It Done Right
Once you're ready, we connect you to the right team to finish it according to your plan — on time, on budget.
Free House Extension Cost Calculator
Use our free smart House Extension calculator to get a fast, real-world cost estimate. No guesswork, no forms — just a clear starting point for your project.
Renovation ROI Calculator
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$0 – $0
Based on AIreno estimates. Results may vary.
Why Planning Matters
Most Problems Start Without a Plan
Blown budgets, missed details, and project delays usually happen when planning is rushed or skipped.
Plan First, Build Smarter
Good planning means real costs, clear scopes, and teams that can deliver properly — without surprises.
Plan Your House Extension Project Step-by-Step
Follow our Free House Extension checklist to understand every stage — from first ideas to final handover. Stay in control, avoid common mistakes, and move forward with confidence.
Free Project Checklist
Estimated Timeframe: 157 Days
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Project Pre-Planning
Define your project goals, budget and big picture plan
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Planning and Design Stage:
Project setup, design and approval
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Site Preparation Stage:
Project preparation and demolition
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Foundation and Structural Work:
Foundation and structural details
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Framing and Roofing:
Wall and roof framing installation
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Electrical, Plumbing, and HVAC:
Services setup and install
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Interior Finishing:
Wall and floor finishes
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Fixture Installation:
Installation of fixtures for included rooms
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Final Touches and Inspections:
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Landscaping and Exterior Finishing:
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Handover
Defects remedied and handover ready
Free Guides to Master Your House Extension Projects
Get the complete picture before you start. Our expert House Extension guides cover everything you need to plan, budget, and deliver your renovation the right way.
Before & After: Powered by AIreno
Before
Total Cost: $39,000
Timeline: 6 weeks
Scope: Custom kitchen with polyurethane cabinets & 20mm Caesarstone benchtop
Planning Journey:
Started with the free AIreno Calculator
Instant Quote completed one month later
Design phase managed through AIreno
Key Steps:
Structural changes flagged — AIreno Planner Mark organised an engineer
Selected a local builder via the platform
Challenges:
Material delays caused two timeline shifts
Outcome: Delivered on time and within budget
Timeline: 6 weeks
Scope: Custom kitchen with polyurethane cabinets & 20mm Caesarstone benchtop
Planning Journey:
Started with the free AIreno Calculator
Instant Quote completed one month later
Design phase managed through AIreno
Key Steps:
Structural changes flagged — AIreno Planner Mark organised an engineer
Selected a local builder via the platform
Challenges:
Material delays caused two timeline shifts
Outcome: Delivered on time and within budget
Ermington - Kitchen House Renovation
Before
Total Cost: $320,000
Scope: House extension, pool upgrade, 2 bathrooms, kitchen, flooring, full interior & exterior paint, render
Timeline: 14 weeks
Planning Journey:
Used AIreno’s Instant Quote to scope the entire project
Planner Jonny coordinated each stage — from design to team selection
All work managed through the platform with real-time updates
Outcome: Transformed family home, completed with high satisfaction
Scope: House extension, pool upgrade, 2 bathrooms, kitchen, flooring, full interior & exterior paint, render
Timeline: 14 weeks
Planning Journey:
Used AIreno’s Instant Quote to scope the entire project
Planner Jonny coordinated each stage — from design to team selection
All work managed through the platform with real-time updates
Outcome: Transformed family home, completed with high satisfaction
Cronulla — Full Home Renovation + Pool
Before
Total Cost: $27,000
Scope: Full bathroom upgrade in a strata-managed apartment
Planning Journey:
Started with AIreno’s Free Calculator to explore costs
Planner Jonny helped gain strata approval
Product selection guided through Reece and Beaumont Tiles
Used the platform to lock in quotes and finalise design
Outcome: Smooth renovation with expert guidance — no surprises
Scope: Full bathroom upgrade in a strata-managed apartment
Planning Journey:
Started with AIreno’s Free Calculator to explore costs
Planner Jonny helped gain strata approval
Product selection guided through Reece and Beaumont Tiles
Used the platform to lock in quotes and finalise design
Outcome: Smooth renovation with expert guidance — no surprises
Randwick — Apartment Bathroom Renovation
Before
Total Cost: $41,500
Scope: Modern bathroom upgrade with walk-in shower & wall-hung vanity, plus full laundry fit-out with cabinetry and stone bench
Timeline: 5 weeks
Planning Journey:
Used AIreno’s Instant Quote tool to scope both areas in one go
Planner Katlyn managed selections, council compliance, and site prep
Guided product choices from ABI Interiors & Reece
Key Steps:
Quote finalised and builder selected within 4 days
Project timelines and tasks tracked in the platform
Outcome: Clean, cohesive finish — delivered faster than expected
Scope: Modern bathroom upgrade with walk-in shower & wall-hung vanity, plus full laundry fit-out with cabinetry and stone bench
Timeline: 5 weeks
Planning Journey:
Used AIreno’s Instant Quote tool to scope both areas in one go
Planner Katlyn managed selections, council compliance, and site prep
Guided product choices from ABI Interiors & Reece
Key Steps:
Quote finalised and builder selected within 4 days
Project timelines and tasks tracked in the platform
Outcome: Clean, cohesive finish — delivered faster than expected
Richmond — Bathroom & Laundry RenovationHouse Extension Questions
Most ground-floor extensions start around $80,000 and go up from there. Use our calculator for a more tailored range.
It depends on your location and design. Your AIreno Planner can guide you through permits and timelines.
Both. We can work with your existing plans or help you scope and plan the design before quoting.
Yes — we can help you plan in stages, based on budget or future goals.
Smarter Tools. Better House Extension Contractors.
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Use the free tools or get your instant quote — then talk to a planner and move forward with total confidence.
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