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

Ground Floor Additions

Expand your living space with a tailored ground floor addition solutions to enhance your home's functionality and value.

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Higher Energy Efficiency

Adding windows and doors that let in more natural light reduce reliance on artificial lighting.

Ideal for Accessibility

Perfect for creating accessible bedrooms, bathrooms, or in-law suites without needing stairs.

Indoor-Outdoor Flow

Easily connect new indoor living spaces to alfresco areas, patios, or gardens.

Boost Property Value

Increasing your square footage not only enhances your living space but also boosts your property's value.

More Living Space

When you need more room, the first thought might be to move or rebuild — but with property prices climbing and land in Sydney scarce, that may not be the best option.

Looking to expand your home? We provide our first floor additions services to the following areas: Sydney, Sutherland, Penrith, Wallacia, Kingswood, Wilberforce, Colyton, Regentville, Londonderry, Leonay, Llandilo, Mulgoa, Dural, Cranebrook, Jamisontown, Claremont Meadows, St Marys, South Penrith, Orchard Hills, Dapto, and Windsor. Our team also specialises in first floor extensions, home additions, and renovations across Western Sydney.

A ground/first floor addition offers a smart alternative, giving you more living space while increasing the value of your home.

Feeling cramped in your own space?

Is your yard underused or impractical?

Not keen on extending upwards?

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Who We Are

Keystone Building is a trusted builder specialising in ground floor additions in Penrith and surrounding Western Sydney suburbs. With years of experience, we deliver high-quality home extensions that blend seamlessly with your existing property. Our local knowledge ensures that every project meets council requirements, complements your home’s design, and maximises usable space. We take pride in turning your ideas into functional, stylish, and durable additions that enhance your lifestyle.

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renovation services emu plains

Why Choose Us

Local Expertise: As a team experienced in local ground floor additions, we understand the unique challenges and opportunities of Penrith homes.
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Quality Craftsmanship: Every project is built to the highest standards, ensuring lasting value and exceptional finishes.
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Transparent Pricing: No hidden costs—our quotes are clear, detailed, and tailored to your project.
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Personalised Service: We work closely with you at every stage, from concept design to project completion.
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On-Time Delivery: We respect your schedule, completing projects efficiently without compromising quality.

How We Can Help

We offer end-to-end services for ground floor additions Penrith, including:

Design & Planning: Tailored concepts to suit your home, lifestyle, and budget.

Council Approvals: Handling permits and approvals to streamline your project.

Construction: Expert building services, minimising disruption while delivering outstanding results.

Custom Solutions: Bedrooms, bathrooms, kitchens, living spaces, home offices, and more.

Support & Advice: Guidance on materials, layouts, and trends to make informed decisions.

Our goal is to create functional and beautiful spaces that increase your home’s value and enhance everyday living. Whether you’re looking for a single-room addition or a full ground floor extension, Keystone Building is your trusted partner for local ground floor additions in Penrith.

Before & After

Your Home, Transformed

A ground floor extention doesn’t just add space—it changes everything.

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BEFORE
AFTER

"To all the team at Keystone, a very big (and very belated) thank you for the wonderful job you all did on our house. It’s just like a new home and suits our bigger family perfectly and as for the timing it was just perfect. Thank you once again we will happily recommend you to family and friends."

Troy Worsley
Emu Plains
Why Choose Us?

Built on Over 30 Years of Experience

A second storey adds an entirely new dimension to your home, opening up a world of opportunity to accommodate for your lifestyle. Here’s why people choose Keystone to complete their second storey addition.

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Built On Time & Budget

We’re committed on completing your build on time and within budget.

Stay Home While We Build

Most clients stay in their homes during construction, no need to pay for rent or storage.

Disruption Kept to a Minimum

We keep noise, mess, & intrusion low, cleaning up daily and protecting your living space.

Customer-First Approach

We design with your lifestyle in mind and keep you involved every step of the way.

No Hidden Costs

Clear, detailed pricing in your contract—no surprises or unexpected charges.

Trusted Family Business

We’ve delivered quality second storey additions since 1997 with honesty and care.

Featured Projects

EXPLORE PROJECTS

Lilydale

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Kan

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Verdi

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Clarke

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Malonga

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River

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VIEW ALL

Our Refined Process

READ MORE
Free introductory session

A phone call where we get to know you, talk about your ideas, budget and goals.

Free Design Consultation

Site visit by our consultant who will sit down with you to address every concept of your proposed build.

Formal Concept Design and Proposal

Concept plan prepared by a Building Designer and formal proposal prepared.

Plans and Approvals

Detailed plans prepared and submitted to relevant authority for assessment and approval.

Preparing to Extend

We prepare you for the construction phase.

Construction Phase

This is when the real work begins – it’s time to turn your dream home into a reality!

Free introductory session

A phone call where we get to know you, talk about your ideas, budget and goals.

Free Design Consultation

Site visit by our consultant who will sit down with you to address every concept of your proposed build.

Formal Concept Design and Proposal

Concept plan prepared by a Building Designer and formal proposal prepared.

Plans and Approvals

Detailed plans prepared and submitted to relevant authority for assessment and approval.

Preparing to Extend

We prepare you for the construction phase.

Construction Phase

This is when the real work begins – it’s time to turn your dream home into a reality!

5.0
40 REVIEWS ON GOOGLE

Our Happy Customers

  • "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

Our trusted suppliers

Our long-standing relationships with reputable brands ensure that every project we deliver not only looks great but stands the test of time. By partnering with specialists in each product category, we’re able to offer you a wide selection, competitive pricing, and materials that meet Australian standards.

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5.0
40+ GOOGLE REVIEWS

Start Your Home Transformation

Your first consultation and quote are on us!

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
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Frequently asked questions

What is a ground floor addition?

A ground floor addition is an extension added to the existing ground level of your home. It creates more living space without sacrificing yard area.

How long does the construction take?

Timelines vary based on project scope and complexity. Keystone Building commits to completing projects on time and within budget.

How does a ground floor addition affect my property's value?

Increasing your home's square footage can enhance its market value. A well-executed addition can provide a higher return on investment.

Why should I consider a ground floor addition?

Avoids the need to move or rebuild.Preserves outdoor space and landscaping.Offers a cost-effective alternative to purchasing a new home.

Will I need to move out during construction?

Most clients remain in their homes during the build. Keystone minimises disruption, keeping noise and mess to a minimum.

What is the process for starting a ground floor addition?

Free introductory session to discuss ideas, budget, and goals.
Site visit and design consultation.
Preparation of concept plans and formal proposal.
Submission of plans for council approval.
Commencement of construction upon approval.

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