Home Addition Price Guide | Keystone Building

Step 1 Your property

Where are you planning to build?

We service the Western suburbs of Sydney, the Hills District, South West Sydney and parts of the Blue Mountains and Hawkesbury areas.

Property address Required Used to determine the service area and prepare the estimate.

Postcode Required Enter the four-digit postcode for the property.

Suburb Required Suburbs are filtered by postcode.

When would you like to start? Required

Step 2 Your addition

How would you like to extend?

Choose the option that best matches the extra space you are considering.

Ground Floor ExtensionExtend out into your available land Second Storey AdditionAdd a new level above your home BothExpand out and add a new level

Extension area onlyThis guide prices the new extension area. You can tell our team about renovations to existing rooms with your enquiry.

Step 3 Your rooms

What spaces do you need?

Choose the rooms and spaces you would like in each part of your addition.

Extension area onlyThis guide prices the new extension area. You can tell our team about renovations to existing rooms with your enquiry.

Step 4 Optional Extras

Which Optional Extras do you want?

Choose the finishing features you want included in your price guide.

Step 5 Your details

Enter your details

Demo modeEmail delivery is temporarily disabled. Your estimate will appear here and no notification will be sent.

Full name Required

Phone Required

Email address Required for the estimate

Your estimate is indicative only, not a fixed-price building quote. Site conditions, selections and approvals may change the final price.

No obligation

Ready to talk to our team?

Submit your enquiry! Answer the questions below and we’ll assess your property online and get in touch to arrange a site visit.

Plan your home addition.

Where are you planning to build?

How would you like to extend?

What spaces do you need?

Which Optional Extras do you want?

Enter your details

Ready to talk to our team?

Thank you for your enquiry.