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.

A ground 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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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

Our Refined Process

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

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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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