Why Choose Us?

Building Dreams Together

A home addition gives 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.

Our Team

We’re a tight-knit crew of qualified builders, carpenters, and project managers who take pride in every job. Whoever you’re talking with, our site team, or our admin staff, you’ll find a friendly, professional face ready to help.

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Ralph Pathuis

Director and Project Manager

With over 20 years of experience in the building industry Ralph loves making his customers homes work for them. When he’s not working, he enjoys time at home shared between maintaining his property and family.

Steve Pathuis

Director and Sales Manager

Over 17 years Steve has been part of many success stories with Keystone. When he’s not working hard making customers happy he enjoys camping, fishing and most water sports. Steve will never say no to a coffee.

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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