House Extension Estimating Services in Australia
Nextron Estimating Pty Ltd provides house extension estimating for builders, owner-builders and homeowners across Australia. We measure your extension plans, price each stage and show how the new work connects to the existing house.
At a Glance
- Service
- House extension takeoff and priced estimate
- Who it is for
- Builders, owner-builders and homeowners
- You send
- Extension plans as PDF or CAD, plus photos or plans of the existing house
- You receive
- A takeoff and priced estimate you can check and adjust
- Timeframe
- Most residential estimates take 1 to 3 business days. Larger projects take longer, and we confirm the timeframe in your quote
- Office
- 26 Bendemeer Way, Palmview QLD 4553. We work with clients across Australia
What Is House Extension Estimating?
An extension estimate prices the new work and the join between the new and the existing house. We measure the extension plans, list each stage, and price it so you can quote or budget the project.
The join between old and new is where costs often change. New openings, beams and matching finishes are listed as separate lines, so you can see what they add.
What Our Extension Estimates Include
Demolition and removal
Where the new work meets the old, as shown on the plans.
Footings, slab or subfloor, framing
The structure of the new area, measured from the plans.
Beams and openings
Structural beams and openings in existing walls, as shown on the drawings.
Roof and external finishes
Roof tie-in, new roof, and cladding or brickwork.
Wet areas and fit-out
Wet areas, kitchens and internal fit-out.
Services connections
Plumbing, electrical and services connections to the existing house.
How an Extension Is Priced in Stages
We list the work in the order it happens on site, so you can check each stage against your plans.
| Item | Unit | How it is measured |
|---|---|---|
| Demolition and preparation | Allowance or m2 | Areas to be removed or opened up, as shown on the plans |
| Footings and slab or subfloor | m3, m2 and lineal metres | Measured from the footing and floor plans |
| Wall framing | Lineal metres and m2 | Measured from the floor plan and elevations |
| Beams and openings | Each and lineal metres | Counted and measured from the structural details |
| Roof | m2 | Area measured from the roof plan, including the tie-in |
| External finishes | m2 | Cladding or brickwork area from the elevations |
| Internal linings and fit-out | m2 and each | Measured from the floor plan and fit-out details |
| Plumbing and electrical | Each and allowance | Counted from the plans, as shown |
Extension Types We Estimate
Rear and side extensions
Single-storey additions at the back or side of a house.
Second storey additions
Adding a new level over an existing house.
Granny flats and studios
Secondary dwellings and studios.
Kitchen and living area extensions
Bigger kitchens and living spaces, with wet areas.
Renovation estimatingWhy Use an Outsourced Extension Estimator
Price the join properly
Tie-in work is listed as separate lines, so it is not missed.
Fewer missed items
Every stage is listed by quantity, so you can check it against the plans.
Quote with confidence
A clear estimate helps you quote or set a budget before work starts.
Related Estimating Services
How It Works
Send your plans
Email the extension plans, and photos or plans of the existing house.
We confirm the scope
We confirm what is included and send a quote and timeframe.
We take off and price
We measure the plans and prepare the priced estimate.
You review and adjust
You review it and we make agreed adjustments.
Important Note
We estimate from the plans and information you supply. We do not provide design, planning advice, engineering or approvals. Your designer, engineer and certifier handle those.
Frequently Asked Questions
What do you need to estimate a house extension?
The extension plans, plus photos or plans of the existing house where the new work joins it.
Do you include a second storey addition?
Yes. Send the plans and any structural details, and we will price what is shown.
Do you design the extension?
No. We estimate from the plans you supply. If you need drawings drafted from your information, see our house extension drawing service.
Do you need to visit my site?
No. We work from your plans and the information you supply. No site visit is needed.
How long does an extension estimate take?
Most residential estimates take 1 to 3 business days. Larger or more complex projects take longer, and we confirm the timeframe in your quote before work starts.
Do you work outside Queensland?
Yes. Our office is in Palmview, Queensland, and we work with clients across Australia by email and phone.
Get a free quote
Send your plans for a free quote. Email info@nextronestimating.com.au or call +61 468 251 702, or use the estimate request form.
Request an estimate