Do I need council approval for an extension in Ashfield?

Almost always yes, and in Ashfield it is usually a Development Application rather than a Complying Development Certificate, because much of the suburb sits inside heritage conservation areas under the Inner West LEP 2022. A rear extension that is not visible from the street is well supported. Outside the conservation areas a CDC may be possible. We confirm which pathway applies to your property before quoting.

How long does a home extension take to build in Ashfield?

Most extensions run 12 to 20 weeks on site. Design and approvals happen before that: a CDC takes about 4 to 8 weeks, and a DA can take up to 6 months, depending on council. We give you a programme with the quote, not after you have signed.

Can I live at home during the extension?

Usually yes. Because the work is concentrated at the rear or side, most Ashfield families stay in the house for most of the build, with a shorter disruptive period when we break through and connect the new space to the old. We plan the breakthrough stage with you so you know exactly when it is coming.

Should I extend out or add a second storey in Ashfield?

On a typical Ashfield block, a rear extension is usually the first option because it keeps the original front of the house intact and the heritage controls favour work that sits behind the existing roofline. Going up is harder in conservation areas and on semis and terraces, but it can be the right call on a small block where the yard has to be kept. We build both, so the advice is honest: we look at your block and tell you which one your home actually wants. A house extension and a second storey are different builds with different engineering, and we quote both honestly.

Will the extension match my Federation house?

That is a design decision, and in Ashfield the heritage controls usually shape it. Many councils prefer a rear extension that reads as clearly new rather than a copy of the original, as long as it sits behind the main roof and respects the scale of the house. Matched brick and rooflines are still possible where the controls allow. What must always match is the standard of the junction between old and new, which is where our detailing does its work.

How will I know what is happening during my extension?

Two ways. You get a weekly update from the builder running your job, whether or not there is good news in it. And you get access to our client portal, where you can log in any time to see your documents, selections, variations and job status. No chasing, no phone tag, no wondering.

Are you licensed and insured?

Yes. Strava Group holds NSW Builder's Licence 487370C and carries public liability insurance and Home Building Compensation Fund cover on all residential work over the statutory threshold. You can verify the licence directly through Verify NSW at verify.licence.nsw.gov.au.

Timber roof and wall framing in a renovation

Home Extensions · Ashfield NSW 2131

Home extensions in Ashfield, done properly.

Rear and side house extensions for Ashfield homes by a licensed extension builder. Most extensions run $70,000 to $300,000 depending on size and how much of the existing house has to change, itemised quote, honest programme, one builder from concept to handover.

Get Your Extension Assessed Call 0450 605 080

NSW Licensed Builder
487370C

Rated 5.0 by our clients on Google

Inner West Council areaNSW Builder’s Licence 487370CItemised quotesClear inclusions & exclusions0450 605 080

Extending out, not up

More room at the back of an Ashfield home.

Strava Group builds home extensions in Ashfield: rear extensions, side returns and whole-of-back transformations that open the house to the yard. Ashfield is an older suburb than the Hills, with Federation and interwar housing on smaller blocks, so an extension here is usually about the rear: pushing the kitchen and living out into the yard, fixing the lean-to that someone added in the 1970s, and getting northern light into rooms that have never had it.

In Ashfield we regularly deliver:

Rear extensions and additions
Side extensions on wider blocks
Open plan kitchen, dining and living
Alfresco and indoor-outdoor connections
New master suites and family rooms
Laundries, mudrooms and storage done properly
Structural openings between old and new
Exterior upgrades to tie old and new together

Thinking about going up instead? That is a different build with different engineering, and we do that too: see second storey additions in Ashfield.

The classic Ashfield brief is a Federation house with a good front half and a tired back half. The rooms at the front are worth keeping. The kitchen, laundry and sunroom at the rear were built badly and need to go.

Rear home extension with dark cladding and wide glass sliding doors opening to the garden

Quick Answer

Most home extensions in Ashfield run $70,000 to $300,000 depending on size and how much of the existing structure has to change, at roughly $2,500 to $4,500 per square metre for ground floor work, with around $30,000 in preliminaries (design, engineering and council approvals, plus site set-up) on top. Demolishing an earlier lean-to, opening double brick walls and working without side access are the things that move the figure most here.

Local knowledge

What we know about extending in Ashfield.

Every suburb builds a little differently. This is what matters when you are extending a Ashfield home.

Council

Ashfield is in the Inner West Council area under the Inner West Local Environmental Plan 2022. A large part of the suburb sits inside heritage conservation areas, which removes the Complying Development pathway and means most extensions go through a Development Application. A rear extension that sits behind the original roofline and is not visible from the street is well supported by the controls. We confirm the pathway for your property before quoting. Current planning controls are published by Inner West Council and on the NSW Planning Portal.

Housing stock

Federation cottages and interwar bungalows, a good number of semis, some Victorian terraces near the station and pockets of 1960s and 70s brick. Many homes have already been extended once, often poorly, with a skillion lean-to or fibro sunroom tacked onto the back. Those earlier additions usually come off.

Structure

Older Ashfield homes are double brick or brick on a timber floor with hardwood framing and terracotta or slate roofs. Cutting a new opening into an old double brick rear wall needs a proper engineered lintel and careful propping, and the new floor has to meet the existing floor level exactly. Semis and terraces share a party wall, which changes the structural and neighbour approach, so those are always custom projects.

Yard and block

Blocks are mostly 350 to 600 square metres and narrow, so side access is the first thing we check on site. Where there is no side access, materials come through the house, which changes the programme and the protection we put in place. A rear extension across the full width of the block, with the yard kept beyond it, is the usual move.

Services and ground

Ashfield sits on shale derived clay soils that move with moisture, and the original footings on a 1910s house were never designed to modern standards. New footings are engineered for the site and detailed against the old ones so the extension does not settle away from the house. Old sewer lines and stormwater often run along or under the rear of the block and need to be located before we design.

Value

Ashfield is a tightly held inner west suburb with the station, schools and proximity to the city holding demand. Character homes with a properly built modern rear are exactly what buyers here pay for, and an extension that keeps the Federation front and opens the back to the yard is one of the safest improvements you can make.

Start here

Tell us about your Ashfield home.

No sales pitch, no obligation. Here is exactly what happens when you enquire:

One at a time, takes about two minutes, so the first conversation is about your project rather than the basics.

Start Your Enquiry Call 0450 605 080

The Strava standard

How we build differently.

An extension lives or dies at the junction between old and new. We build for longevity, and on every Ashfield extension we run:

Every new-to-existing junction properly detailed

This is where most extensions crack, leak and part company with the house. It is almost always a detailing shortcut, not settlement. Ours get a proper structural tie, flashing and movement detail.

The existing structure gets rectified, not covered

Where the extension meets the house, we screw off and re-brace the adjoining structure, tying new and old together so the whole building moves as one and future cracking is designed out, not painted over.

Footings matched to the ground, not the minimum

New footings are engineered for your soil and detailed against the existing ones, because differential movement between old and new slabs is the classic extension failure, and it matters more on a century-old house whose original footings were never engineered.

Furring channels for a dead flat finish

Where new ceilings and walls run through to existing rooms, furring channels give one level plane across both, so you cannot see where the house ends and the extension begins.

Waterproofing is a documented hold point

New wet areas are inspected and photographed before a single tile goes on, to AS 3740, and new roof-to-old-roof junctions get the same treatment.

Everything photographed before it is covered

You receive the record at handover, so in ten years you know exactly what is behind your walls and under your floor.

Before starting Strava Group, I spent seven years on the tools as a carpenter and five years running sites. The failures I kept seeing in extensions were always at the join: cracked cornices along the old wall line, roofs that leaked where new met old, floors that stepped as slabs settled differently. None of it was illegal. All of it was avoidable. None of this shows up in a finished-room photo. All of it shows up in year seven.

Honest numbers

What a house extension actually costs in Ashfield.

Most builders will not put numbers on a website. We will, because the alternative is wasting your time and ours across three meetings before anyone mentions a figure.

Item	Typical range
Home extension, depending on size and scope	$70k–$300k
Ground floor extension work	$2,500–$4,500 /m²
Preliminaries, on top of build cost	approx. $30,000

Preliminaries are the costs that exist before a single wall moves: design, engineering and council approvals, plus site set-up such as site fencing, temporary services, waste removal, insurances and supervision. They are real, they are unavoidable, and a quote that does not show them separately has either buried them or forgotten them.

In Ashfield the smaller blocks and heritage controls tend to keep projects in the lower and middle part of the band, but narrow side access and the work involved in taking off an earlier lean-to can add to it. How much of the existing structure has to change is usually the largest single factor, followed by wet areas and access.

Every project is quoted properly after a site inspection. These ranges are here so you can decide whether it is worth a conversation.

Good to know

Ashfield extension questions.

From our clients

Rated 5.0 on Google.

5.0·Google reviews

We had Strava Group complete major renovation works on our property and were blown away with the quality. The attention to detail and overall finish were amazing.

Aloona T.

Google review

Read our Google reviews

Nearby

Home extensions near Ashfield.

We build extensions across the inner west. Select a suburb for local council information and what extensions there typically cost.

Inner West

Home Extensions Burwood Home Extensions Strathfield Home Extensions Dulwich Hill Home Extensions Marrickville Home Extensions Leichhardt

All Sydney extension areas

Looking for a different service in Ashfield? We also build second storey additions in Ashfield and home renovations in Ashfield.

Extend your Ashfield home properly.

Ready for more room?

Tell us about your property and what you want to add. We respond within 24 to 48 business hours with honest advice and real numbers, no cost, no obligation.

Get Your Extension Assessed Call 0450 605 080