Keystone Home Additions
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Specialising in First Floor & Ground Floor Additions in Western Sydney Keystone Building Services is your go-to builder in the Penrith Nepean area.
We specialise in Ground Floor Additions, Second Storey Additions, Home Extensions, Home Additions and Renovations. We are based in Penrith and service the Greater Western Sydney, Inner West Sydney, The Hills District, Blue Mountains, North Western Suburbs, Cranebrook, Cambridge Park, Emu Plains, Blaxland, Werrington, Castlereagh, Leonay, St Marys, Mulgoa, Mount Druitt, St Clair, Parramatta, Greystanes, Kellyville, Kingswood, Glenmore Park, Eastwood, Ryde, Colyton.
We're unlocking the hidden potential in this federation home – raising it up to access those city views we showed you earlier this week.
The transformation doesn't stop there... while they'll gain valuable space upstairs, downstairs is being completely reimagined into a modern open-plan kitchen, dining and living area. To top it off, a new alfresco outdoor kitchen will create the perfect space for entertaining family and friends year-round.
au have been out capturing the transformation from above with the drone. You can really see the floor plan come together from there!
03/06/2026
More space without the stress, or the budget blowout. Keystone brings 20+ years of local experience to every build, handles the council approvals, and keeps the whole process on time and on budget. Get in touch to find out what's possible.
01/06/2026
If you've been thinking about going up instead of moving out, Keystone builds second storey additions that are designed around you. Get in touch with the team to get the conversation started.
The wait is over. Here's the full reveal of the Keystone build we teased earlier in the year. A complete second storey addition that transformed this home from the roof up. New upper level, new roofline, new windows, and a finish that looks like it was always meant to be there.
27/05/2026
We love it when the roof goes on! We're adding 45 square metres to this family's home and they didn't even have to move out. Every Keystone addition is built around your family's schedule, with as little disruption as possible along the way. This is just what it looks like when the job is done right.
Who's keen for the final reveal soon? 👀
For 12 years Corinne's been the one on the other end of the line when you call us, holding down the fort behind the scenes and being across absolutely everything... we really are saying goodbye to a legend!
It's her second go at retirement, so this time we're making sure she sticks to it so she can go on some well-deserved adventures now that she has the luxury of time. She's earned it!
A big thanks for over a decade of dedication, all the laughs and everything you’ve brought to the team, Corinne... it's the end of an era... you will be missed!
18/05/2026
From dated to dream home, this St Clair transformation added 169m², three bedrooms, two bathrooms, new living spaces, and a sleek double garage. Finished with solar skylights, fresh render, and a modern entryway, it’s style, space, and smart design in one.
Ready to transform your space? Call us on 02 4722 5466 or visit keystonebuilding.com.au
13/05/2026
One of our freshly completed second-storey additions. The kind of result that makes the neighbours take a second look.
Visit keystonebuilding.com.au or give us a call on 02 4722 5466 to learn more about our specialised approach to home extensions.
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Telephone
Address
1/29 Coombes Drive
Penrith, NSW
2750
Opening Hours
| Monday | 8am - 5pm |
| Tuesday | 8am - 5pm |
| Wednesday | 8am - 5pm |
| Thursday | 8am - 5pm |
| Friday | 8am - 5pm |