Do I need council approval for an extension in North Rocks?

Usually yes, but often not a full DA. Many North Rocks homes qualify for a Complying Development Certificate through a private certifier, provided the extension meets the setback, site coverage and landscaped area controls, which is much faster than a DA through the City of Parramatta Council. Bushfire prone blocks near the reserves remove the CDC option. We confirm which pathway applies to your property before quoting.

How long does a home extension take to build in North Rocks?

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 North Rocks 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 North Rocks?

On a typical North Rocks block, extending out is usually the better path because the land is there, and on the sloping blocks a stepped rear extension makes the fall work for you. Going up makes more sense where the yard has to be kept whole or the outlook is only available higher. 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 existing brick house?

That is a design decision, and both answers can work. Matching 1970s face brick exactly is often impossible because the brick is no longer made, so we either source the closest match and blend it, render the junction, or design a deliberately contemporary addition that lets the original house be itself. What must always match is the standard of the junction between them, 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 · North Rocks NSW 2151

Home extensions in North Rocks, done properly.

Rear and side house extensions for North Rocks 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

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City of Parramatta Council areaNSW Builder’s Licence 487370CItemised quotesClear inclusions & exclusions0450 605 080

Extending out, not up

North Rocks blocks were made for extending.

Strava Group builds home extensions in North Rocks: rear additions, side extensions and whole-of-back transformations that open the house to the yard. North Rocks was built out mostly in the 1960s and 70s, which means solid brick homes on generous blocks in the hills between Carlingford and Baulkham Hills, many of them sloping, most of them with a backyard the original house barely uses. It is prime extension country: the land is there, the structure is honest, and the layout at the back is the thing that needs fixing.

In North Rocks 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.

A 1970s North Rocks brick home with a small kitchen at the back and a big sloping yard behind it is the brief we see most. Open the back, bring the living to the light, and let the house meet the garden.

Kitchen with a white island, timber-look overhead cabinetry and LED strip lighting

Quick Answer

Most home extensions in North Rocks 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. The larger blocks here support substantial open plan extensions, which tends to put projects in the middle of the band, with sloping sites adding to it.

Local knowledge

What we know about extending in North Rocks.

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

Council

North Rocks sits in the City of Parramatta Council area under the Parramatta Local Environmental Plan 2023 and the Parramatta Development Control Plan. Most detached homes on standard residential zoning can pursue a ground floor extension through Complying Development with a private certifier rather than a full DA, subject to setbacks, site coverage and landscaped area. Bushfire prone blocks near the reserves and creek lines go to a DA. We confirm the pathway for your property before quoting. Current planning controls are published by City of Parramatta Council and on the NSW Planning Portal.

Housing stock

Predominantly brick veneer and full brick homes from the 1960s and 70s, many of them substantial and split level on the sloping blocks, with some later two storey houses. The typical plan has formal rooms at the front, a modest kitchen, and a back door onto a patio that never matched the block behind it. That is exactly the layout an extension is designed to fix.

Structure

Brick veneer homes of this era are straightforward to extend once the load path is engineered, and full brick homes need more care at the junction: we cut the openings cleanly, install engineered steel and tie the new frame into the existing brickwork properly. Split level homes, common on the North Rocks slopes, need the new floor levels planned carefully against the existing ones.

Yard and block

Blocks in North Rocks are typically 650 to 1,000 square metres, many of them sloping toward the creek lines and reserves. The slope shapes the design: on the steeper blocks the extension steps down the site and the space underneath becomes useful. The size of the block means a substantial rear extension is possible while keeping a real backyard.

Services and ground

North Rocks sits on shale derived clay over sandstone, with the rock close to the surface on the slopes. Footing design varies across a single block, so the engineering is done for your site, and new footings are detailed against the existing ones so the extension does not settle away from the house. Bushfire construction requirements apply on the blocks backing the reserves, and sewer lines often run along the rear boundary.

Value

North Rocks is a tightly held family pocket with the schools, the parks and the quiet holding demand. A well built extension that converts a dated rear layout into open plan living with a genuine yard connection is one of the most reliable improvements you can make here, and it usually costs less than the stamp duty and agent fees involved in moving to a bigger house nearby.

Start here

Tell us about your North Rocks 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 North Rocks 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 the mix of clay and shallow sandstone across North Rocks means the engineering is done for your site, not copied from a neighbour.

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 North Rocks.

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 North Rocks the larger blocks support substantial extensions, which tends to put projects in the middle of the band, with sloping sites and bushfire requirements on some blocks adding design and engineering work. How much of the existing structure has to change is usually the largest single factor, followed by wet areas and how far footings have to go to find rock.

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

North Rocks extension questions.

From our clients

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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.

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Nearby

Home extensions near North Rocks.

We build extensions across The Hills and Parramatta and the surrounding suburbs. Select a suburb for local council information and what extensions there typically cost.

The Hills and Parramatta

Home Extensions Carlingford Home Extensions Baulkham Hills Home Extensions North Parramatta Home Extensions Winston Hills Home Extensions West Pennant Hills

All Sydney extension areas

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

Extend your North Rocks 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