Extensions and additions, from an award winning builder.

Second storeys, rear additions and whole home renovations on established Sydney houses.

Get a free cost range Book a site inspection

Adding to a house you are still living in.

Most of the homes we extend are heritage affected, occupied, or both. That changes the sequence of the build more than it changes the build itself.

Piper Moss brings together Stephen's 40 years of building, with estimating and risk-control expertise gained through major NSW infrastructure projects.

What we add.

Extensions on established Sydney homes, planned around the way you actually use the place.

Rear additions

Ground floor additions that open the back of the house to the garden and the light.

Second storeys

Adding a level to an existing home, including the structural work underneath it.

Attic conversions

Using the roof space you already have, with proper access and headroom.

Whole home renovation

Reworking the whole plan rather than adding to a layout that never worked.

Kitchens and bathrooms

Wet areas with the waterproofing detailed properly the first time.

Heritage fabric

Conservation areas and heritage items, worked through council with the right trades.

Before you call

Get a cost range in a couple of minutes.

Our extension estimator walks you through seven steps and gives an indicative range for your project. No sign up, and no obligation.

Try the extension estimator Talk to the builder

Before you choose

See your extension in 3D, in the materials you choose.

Try cladding, roofing, decking, paving and window frames on a 3D Sydney extension in our free Material Studio. Start from one of four palettes we would build ourselves, see it in year ten, and get an indicative range for a single-storey extension.

Open the Material Studio Send us your project

Concept visualisation only. The range is indicative and may change after a site inspection.

Exterior cladding

Spotted Gum shiplap, Blackbutt battens, fibre cement weatherboard, standing seam steel or smooth render, each marked Standard, Mid-tier or Premium.

COLORBOND® roof colours

Corrugated COLORBOND® steel in a low-sheen finish, in Monument, Woodland Grey or Surfmist. Or terracotta or concrete tile, with the low-pitch extension roof in steel to suit.

Day one and year ten

Switch to year ten for an indicative look at how each finish ages, from hardwood silvering to paint fading, with the upkeep each one asks for.

Bushfire and coastal sites

Mark bushfire-prone land or a site within 1 km of the sea, and every material carries our builder's notes for it. Your BAL comes from a bushfire assessment, not from the Studio.

Can I see cladding and roofing on my extension before I commit?

Yes. In our free Material Studio you can try exterior cladding, COLORBOND® roof colours, decking, paving and window frames on a 3D Sydney extension, then switch to year ten to see indicative ageing. Mark bushfire-prone land or a site within 1 km of the sea for our builder's notes on each material. Send us your details and it shows an indicative range for a single-storey extension in your choices, and our builders call you to scope it. The range may change after a site inspection.

Staged so you can stay in it.

We plan the work so the house stays weather tight at every stage, and so the parts you need most, a kitchen, a bathroom, a way in and out, are not all offline at once.

On a second storey that means getting the new roof structure on and closed before the existing ceiling comes out. On a rear addition it means keeping the existing rear wall working as a weather line until the new envelope is sealed.

In conservation areas and on heritage items the constraints come earlier, at council and in the documentation, rather than turning up as surprises mid build.

Working with us.

Inspect and scope

We attend site, establish what is actually wrong and put the scope in writing before anyone talks about price.

Estimate and de-risk

Priced line by line with the assumptions stated. Provisional items are named and capped, never buried in the total.

Build and hand over

Supervised on site, reported weekly, and handed over with documentation, warranties and a defects period we answer.

Licensed, insured and accountable.

NSW Builder Licence 497435C, Class 2. Building practitioner registration BUP4255006.
Master Builders Association NSW Excellence in Housing winner, 2019, Stephen J. Auld, for a Bronte design and construct.
Eligible for HBCF (icare) builder cover.
Public liability and workers compensation in force.
Work across residential, commercial and heritage building classes.

Tell us about the house and the addition.

[email protected]
0478 183 300
Mon to Fri 7am to 6pm, Sat 8am to 2pm