info@keystonebuilding.com.au
02 4722 5466
5.0
40+ GOOGLE REVIEWS

Trusted Home Renovations in Kellyville That Really Work

With over 20+ years’ experience in Sydney’s north-west, we transform homes to complement our client’s lifestyles and budgets.

GET A QUOTE

25 years renovating homes across Western Sydney, backed by a 5.0-star rating from 40-plus Google reviews. Every Kellyville project runs on fixed-price contracts, full licensing and insurance.

A two-storey Hamptons-style home photographed at dusk with warm interior lighting and a wide verandah.

Kellyville's Local Home Building Specialists

With over 20 years renovating homes across Sydney, we understand how The Hills Shire Council reviews a renovation application in Kellyville, and the block layouts common to the area. That experience means fewer surprises once your Kellyville project gets underway.

Our Services in Kellyville

More room for a growing Kellyville family, without leaving the home they love. Keystone Building has been designing and building major home renovations, second storey additions and ground floor additions since 1997, with one family-run builder seeing every project through from first sketch to final handover.

Second storey additions

Build up with a second storey addition and keep your yard. Architecturally known as a first floor addition, Kellyville homeowners choose a second storey extension to add a whole new level of bedrooms, bathrooms and living areas above theirexisting home, without touching the backyard, pool or garden. The build usually starts with a structural engineer confirming your existing foundations can carry a new level, then moves on to removing the existing roof and reinforcing the structure below. For a growing family, it is one of the most popular home additions for gaining room without moving.

FIND OUT MORE
An illustration of a two-storey house with a double garage.A dark blue triangular arrow icon.

Ground Floor Extensions

Extend your home at ground level. Ground floor extensions Kellyville families love to add for single-level living include easy indoor-outdoor flow and step-free access. These ground floor extensions create more space and new living areas for everyday life without adding a staircase, and they can lift the value of your property at the same time.

FIND OUT MORE
An illustration of a single-storey house with weatherboard and rendered sections beneath a hipped roof.A dark blue triangular arrow icon.

Major home renovations

Reimagine the home you have with complete home renovations. Kellyville homeowners who want to reconfigure their floor plan to unlock better flow, more light, modern kitchen and bathroom renovations, all finished to a high standard of quality, choose Keystone Building to create lasting value from their existing property

FIND OUT MORE
A blue floor plan diagram of a house layout.A dark blue triangular arrow icon.

Design & Council approvals

One team, start to finish. We handle concept design, engineering, structural drawings, certifications and the Hills Shire City Council approvals in-house, so you are never left chasing separate consultants.

FIND OUT MORE
A dark blue triangular arrow icon.

Building in Kellyville: What Local Homes Need

Larger, established blocks

Many Kellyville homes sit on generous lots of 600 square metres or more. That land is the reason people move here, so wherever it makes sense we build up rather than out, adding living space while leaving the yard, pool and side access exactly as they are.

Reactive clay soils

Pockets across Western Sydney sit on reactive clay that swells and shrinks with the seasons. It is a normal local condition, not a barrier, but it does mean footings and any structural reinforcement are engineered specifically for your site rather than assumed.

Hot summers and BASIX

Keystone holds a 5.0-star rating across more than 40 Google reviews, with feedback from homeowners right across the the Hills Shire LGA who have added a level, extended out or renovated with us.

Home addition & extension approvals

Every home addition or extension requires the right approvals. Depending on your project, this may be through a Complying Development Certificate (CDC) or a Development Application (DA) with Penrith City Council.

We identify the right approval pathway from the start and prepare your plans to meet the relevant planning controls, helping keep the approval process efficient and your project moving forward.

Why Kellyville Families Choose Keystone

Adding a top level, extending out or renovating is a big commitment, so the builder you choose matters. As a family-run business, Keystone makes the whole renovation process feel manageable, guiding you through every stage with quality workmanship and a genuine focus on your family's lifestyle. Here is why Kellyville families choose us.

A blue line icon of a calendar with a tick.

Built On Time & Budget

With careful planning, clear communication and realistic scheduling, we keep your home addition on budget and on time (sometimes even earlier, when possible!).

A blue line icon of a person beneath a house roof.

Stay Home While We Build

Staged construction methods mean most families remain in the home throughout the build, saving on rent and storage.

Minimal Disruption

We contain dust, manage noise, tidy up daily and protect your finishes while we work.

A blue map location-pin icon containing a person.

Customer-First Approach

Every layout starts with how your family actually lives, and you are involved in every key design decision.

A blue line icon of a dollar sign with a line through it.

No Hidden Costs

We provide a detailed fixed price building contract that clearly outlines the scope of works and project costs, giving you confidence before construction begins.

A blue line drawing of a three-person family.

Trusted Family Business

Nearly three decades of home extensions, additions and renovations, delivered by a local, family-run team that has been in business since 1997.

GET A QUOTE

Featured Projects

EXPLORE PROJECTS

Real completed work from across the the Hills Shire Local Government area, shown as before-and-after pairs and captioned with the suburb and project type. Each one is a snapshot of the quality of workmanship we bring to every house we work on.

Malonga

View Project
VIEW ALL

Our Refined Process

READ MORE

1. Free introductory session

A relaxed phone call to get to know you, your ideas, your budget and your goals.

2. Free Design Consultation

A site visit where we sit down and talk through every concept of your proposed build.

3. Formal Concept Design and Proposal

A concept plan from a qualified Building Designer, paired with a fixed-price proposal.

4. Plans and Approvals

Architectural and structural drawings prepared and lodged with the relevant authority.

5. Preparing to Extend

We walk you through the pre-construction checklist so you are ready for day one.

6. Construction Phase

The real work begins, and your vision becomes a finished, lived-in home.

A grey left-pointing chevron arrow.
A white right-pointing chevron arrow.

Free introductory session

A relaxed phone call to get to know you, your ideas, your budget and your goals.

Free Design Consultation

A site visit where we sit down and talk through every concept of your proposed build.

Formal Concept Design and Proposal

A concept plan from a qualified Building Designer, paired with a fixed-price proposal.

Plans and Approvals

Architectural and structural drawings prepared and lodged with the relevant authority.

Preparing to Extend

We walk you through the pre-construction checklist so you are ready for day one.

Construction Phase

The real work begins, and your vision becomes a finished, lived-in home.

A grey left-pointing chevron arrow.
A white right-pointing chevron arrow.
Map highlighting the western and southwestern suburbs of Sydney, Australia, including areas like Penrith, Liverpool, Parramatta, and Campbelltown with major roads and surrounding regions.

Areas We Serve in the the Hills Shire LGA

We build throughout Kellyville and surrounding suburbs, so wherever you are in the local area there is a good chance we are already working nearby.

5.0
40 REVIEWS ON GOOGLE

Our Happy Customers

Keystone holds a 5.0-star rating across more than 40 Google reviews, with feedback from homeowners right across the the Hills Shire LGA who have added a level, extended out or renovated with us.

  • "To everyone who is reading this with intention to build a first floor addition, your search should end here.”
    Andrea
    NSW
  • "Thank you so much for all your dedicated hard work and especially your consideration to our family during the renovation of our home.”
    Tracey, Jason, Liam & Mackenzie Brown
    NSW
  • “All the tradesman involved in the renovation process were prompt, courteous and very meticulous.”
    Cathy & Stephen Bone
    NSW
  • "Their workmanship is second to none that I have seen and the service and tradespeople they used were fantastic."
    Reginald Moodley
    Penrith
  • "The staff was very friendly and kept our premises spotless and clean. Nothing was too difficult or out of their way. "
    Neil Moodley
    Glenmore Park
  • "The whole process was professional, on time and on budget. The tradesmen were all brilliant and meticulous.”
    Chris and Jim
    Harrington Park
"Their workmanship is second to none that I have seen and the service and tradespeople they used were fantastic."
Reginald Moodley
Penrith
"The staff was very friendly and kept our premises spotless and clean. Nothing was too difficult or out of their way. "
Neil Moodley
Glenmore Park
"The whole process was professional, on time and on budget. The tradesmen were all brilliant and meticulous.”
Chris and Jim
Harrington Park
"To everyone who is reading this with intention to build a first floor addition, your search should end here.”
Andrea
NSW
"Thank you so much for all your dedicated hard work and especially your consideration to our family during the renovation of our home.”
Tracey, Jason, Liam & Mackenzie Brown
NSW
“All the tradesman involved in the renovation process were prompt, courteous and very meticulous.”
Cathy & Stephen Bone
NSW
"Their workmanship is second to none that I have seen and the service and tradespeople they used were fantastic."
Reginald Moodley
Penrith
"The staff was very friendly and kept our premises spotless and clean. Nothing was too difficult or out of their way. "
Neil Moodley
Glenmore Park
"The whole process was professional, on time and on budget. The tradesmen were all brilliant and meticulous.”
Chris and Jim
Harrington Park
"To everyone who is reading this with intention to build a first floor addition, your search should end here.”
Andrea
NSW
"Thank you so much for all your dedicated hard work and especially your consideration to our family during the renovation of our home.”
Tracey, Jason, Liam & Mackenzie Brown
NSW
“All the tradesman involved in the renovation process were prompt, courteous and very meticulous.”
Cathy & Stephen Bone
NSW
"Their workmanship is second to none that I have seen and the service and tradespeople they used were fantastic."
Reginald Moodley
Penrith
"The staff was very friendly and kept our premises spotless and clean. Nothing was too difficult or out of their way. "
Neil Moodley
Glenmore Park
"The whole process was professional, on time and on budget. The tradesmen were all brilliant and meticulous.”
Chris and Jim
Harrington Park
"To everyone who is reading this with intention to build a first floor addition, your search should end here.”
Andrea
NSW
"Thank you so much for all your dedicated hard work and especially your consideration to our family during the renovation of our home.”
Tracey, Jason, Liam & Mackenzie Brown
NSW
“All the tradesman involved in the renovation process were prompt, courteous and very meticulous.”
Cathy & Stephen Bone
NSW
"Their workmanship is second to none that I have seen and the service and tradespeople they used were fantastic."
Reginald Moodley
Penrith
"The staff was very friendly and kept our premises spotless and clean. Nothing was too difficult or out of their way. "
Neil Moodley
Glenmore Park
"The whole process was professional, on time and on budget. The tradesmen were all brilliant and meticulous.”
Chris and Jim
Harrington Park
"To everyone who is reading this with intention to build a first floor addition, your search should end here.”
Andrea
NSW
"Thank you so much for all your dedicated hard work and especially your consideration to our family during the renovation of our home.”
Tracey, Jason, Liam & Mackenzie Brown
NSW
“All the tradesman involved in the renovation process were prompt, courteous and very meticulous.”
Cathy & Stephen Bone
NSW
"Their workmanship is second to none that I have seen and the service and tradespeople they used were fantastic."
Reginald Moodley
Penrith
"The staff was very friendly and kept our premises spotless and clean. Nothing was too difficult or out of their way. "
Neil Moodley
Glenmore Park
"The whole process was professional, on time and on budget. The tradesmen were all brilliant and meticulous.”
Chris and Jim
Harrington Park
"To everyone who is reading this with intention to build a first floor addition, your search should end here.”
Andrea
NSW
"Thank you so much for all your dedicated hard work and especially your consideration to our family during the renovation of our home.”
Tracey, Jason, Liam & Mackenzie Brown
NSW
“All the tradesman involved in the renovation process were prompt, courteous and very meticulous.”
Cathy & Stephen Bone
NSW
"Their workmanship is second to none that I have seen and the service and tradespeople they used were fantastic."
Reginald Moodley
Penrith
"The staff was very friendly and kept our premises spotless and clean. Nothing was too difficult or out of their way. "
Neil Moodley
Glenmore Park
"The whole process was professional, on time and on budget. The tradesmen were all brilliant and meticulous.”
Chris and Jim
Harrington Park
"To everyone who is reading this with intention to build a first floor addition, your search should end here.”
Andrea
NSW
"Thank you so much for all your dedicated hard work and especially your consideration to our family during the renovation of our home.”
Tracey, Jason, Liam & Mackenzie Brown
NSW
“All the tradesman involved in the renovation process were prompt, courteous and very meticulous.”
Cathy & Stephen Bone
NSW
"Their workmanship is second to none that I have seen and the service and tradespeople they used were fantastic."
Reginald Moodley
Penrith
"The staff was very friendly and kept our premises spotless and clean. Nothing was too difficult or out of their way. "
Neil Moodley
Glenmore Park
"The whole process was professional, on time and on budget. The tradesmen were all brilliant and meticulous.”
Chris and Jim
Harrington Park
"To everyone who is reading this with intention to build a first floor addition, your search should end here.”
Andrea
NSW
"Thank you so much for all your dedicated hard work and especially your consideration to our family during the renovation of our home.”
Tracey, Jason, Liam & Mackenzie Brown
NSW
“All the tradesman involved in the renovation process were prompt, courteous and very meticulous.”
Cathy & Stephen Bone
NSW
VIEW ALL
A white right-pointing chevron arrow.
5.0
40+ GOOGLE REVIEWS

Talk to Sydney's Home Renovation Specialists

Every Keystone project starts with a free, no-obligation consultation, a relaxed conversation about what you want your Trusted Home Renovations in Kellyville That Really Work home to become. We will walk you through the whole journey, from the first design idea to council approval and the construction schedule that follows. There is no pressure and no cost to find out what is possible. Give us a call on 02 4722 5466 or request a quote online to get started.

Get a free consultation and quote with no obligation.
Share your plans and speak directly with our team.
Ask questions about timing, approvals, or next steps.
info@keystonebuilding.com.au
02 4722 5466
Unit 1, 29 Coombes Drive, Penrith 2750
Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.