Sloping Block Builder Wollongong and Illawarra
The best blocks in the Illawarra are rarely flat. The sites with the outlook are the sites with the fall. TAG Homes designs and builds custom homes on them, with our drafting team, on a fixed-price contract. Boutique custom home builder based in Unanderra. Winner of the 2026 Master Builders NSW Southern Regions Excellence in Building Awards, Medium Density Projects, Dual Occupancy category. 2024 HIA NSW Region Start-up Business Award winner. NSW Builder's Licence 369859C. Fourteen homes completed since 2020.
Why Escarpment and View Blocks Are Different
A flat block gives you a slab, a driveway and a house. An escarpment block gives you a view, then asks questions. How much fall is there? Is there rock, and how close to the surface? Where does the water go when the slope above drains after a storm? None of these are reasons not to build. They are the reasons the design and the engineering must be worked out together, and early. We walk the block before a line is drawn, arrange the survey and geotechnical testing, and let the ground tell us which way the house wants to go.
Split-level, Pole and Pier, Cut and Fill
Cut and fill is what most people picture: soil cut from the high side and pushed to the low side to make one level platform, held with retaining walls. It works on gentle falls. The steeper the block, the taller the walls and the more of the outlook you bury.
A split-level home steps down the slope instead of fighting it. The house sits on two or three platforms, joined by short runs of stairs, so each part of the home meets the ground close to its natural level. Living areas sit above the street for privacy and view, and a garage tucks under the living level in space that would otherwise be dead.
Pole and pier construction lifts the house off the ground. Steel or timber posts stand on concrete piers taken down to sound ground or rock, and the floor is suspended above the slope. The land underneath stays largely as it was, which suits steep downslope sites and rock close to the surface. On many escarpment blocks the right answer is a mix: split-level on the upslope side, a suspended floor over the downslope side, and only as much cut as the driveway needs.
Retaining Walls and Drainage
Retaining walls on a sloping block are structure, not landscaping. They hold up the driveway, the neighbour's yard and sometimes the house, so each one is designed by a structural engineer for the actual soil and height, with proper drainage behind it. Water is what fails retaining walls, and on the escarpment there is a lot of it. The design has to catch it at the top of the site and carry it past the house to the street or an approved easement. Walls above a certain height can need their own council approval.
Bushfire and the Energy-rating and Sustainability Requirements in Plain Words
Blocks backing onto the escarpment reserve usually carry a bushfire attack level rating. A bushfire consultant rates the exposure from how close the bush is and how steep the ground between it and the house is. That rating sets what the house is built from: glazing, cladding, decking, roof detail and ember sealing all step up as the rating rises, so it belongs in the design brief from day one.
New homes in NSW are assessed against the energy-rating and sustainability requirements as part of approval, and we coordinate that assessor alongside the engineers. On a view block that is a balancing act: the glass everyone wants faces the ocean or the escarpment, and the assessment cares about where the sun comes in and how the house holds heat in winter and sheds it in summer. We bring the assessor in while the plan is still being drawn, so the view windows stay and compliance comes from insulation, shading and glazing selection rather than from shrinking the openings.
How Our Drafting Team Designs to the Slope
Design and construct with our drafting team starts with the survey and the geotechnical report, not with a floor plan. The contours, the rock line, the bushfire rating and the view corridors go on the drawing board first. Then the home is drawn to fit them: where the driveway can enter at a workable grade, where the platform breaks, which rooms earn the outlook and which can sit against the hill. Because the people who draw it also build it, the engineers, the bushfire consultant and the energy assessor work to one set of documents before the development application is lodged. Read more about how a custom home comes together with TAG Homes.
Where We Build on the Escarpment and the Hills
In the north: Stanwell Park, Coalcliff, Scarborough, Austinmer, Thirroul and Bulli, where access is often the first problem to solve. Around Wollongong: Mount Keira and Figtree, where hillside streets carry more fall than they show from the road. In the south: the Kiama hillsides, the headland blocks and the elevated ocean-outlook blocks close to the escarpment. TAG Homes has built across sloping sites from Woonona to Bulli to Kiama. For the northern suburbs, see our Thirroul, Austinmer and Bulli builder page.
Sloping Sites Are Most of Our Work
Most of the Illawarra has some slope to it, and a significant proportion of TAG projects sit on sloping, coastal or escarpment sites. An escarpment build still needs the engineer, the drafting team and the site crew talking to each other for the whole build, and that is how we run every one of them.
Call Grant about Your Sloping Block
If you own or are looking at a sloping block anywhere from Stanwell Park to Vincentia, the first step is a site walk. Call Grant on 0423 409 212 for a straight read on what the site involves. For more background, read our guide to building on a sloping block in the Illawarra.
Frequently Asked Questions about Building on a Sloping Block
What decides the site cost on a sloping block?
The degree of fall, whether there is rock, the height of retaining walls and how hard the site is to access. We price a sloping block from a site inspection, a survey and a geotechnical report, never from a rule of thumb. Call Grant on 0423 409 212 to walk your block.
What is the difference between split-level and pole and pier construction?
A split-level home steps down the slope on two or three platforms at different heights, joined by short stairs, so the earthworks are smaller than one big cut. Pole and pier construction stands the house on posts and concrete piers with a suspended floor, leaving the ground underneath largely untouched. Split-level suits gentle to moderate falls; pole and pier suits steep downslope blocks and sites with rock close to the surface. Many escarpment homes use both.
Should I get a geotechnical report before I buy a sloping block?
On a block with real fall, yes. A geotechnical report tells you what is under the topsoil, how deep the rock sits and how the ground behaves when it is cut, which is exactly what drives the footing design and the site work. It is far better to know that before you own the block, and it lets us give you a straight answer on what the site involves before you commit.
Will my escarpment block need a bushfire attack level assessment?
If the block backs onto or sits near the escarpment reserve or other bushland, almost certainly. A bushfire consultant rates the exposure, and that rating sets the construction requirements for glazing, cladding, decking, roofing and ember sealing. We arrange the assessment during design so the materials are specified correctly from the start.
Do retaining walls need council approval in Wollongong?
Retaining walls above a certain height can need their own approval from Wollongong City Council, and engineered plans for retaining and drainage usually form part of the construction documentation for any sloping block. We include the retaining and drainage design in the documentation set so the approval is dealt with once, with the house, rather than as a separate exercise.
Can I keep the view and still meet the energy-rating and sustainability requirements?
Yes, if the assessor is involved while the house is being designed rather than after. Large windows toward the ocean or the escarpment can be kept when the rest of the design carries the load: insulation, shading, glazing selection, orientation and how the house holds heat in winter and sheds it in summer. Trying to fix the rating after the plan is drawn is what leads to shrinking the windows.
Do you build sloping block homes in Thirroul, Austinmer, Coalcliff and Stanwell Park?
Yes. We build custom homes on sloping and escarpment blocks across the northern Illawarra, including Stanwell Park, Coalcliff, Scarborough, Austinmer, Thirroul and Bulli, as well as the Wollongong hillside suburbs of Mount Keira and Figtree, and the Kiama hillsides in the south. TAG Homes has built across sloping sites from Woonona to Bulli to Kiama.
Can you build from my architect's plans, or do I need to use your drafting team?
Either. If you have development application approved or complying development approved plans, we quote the construction from them. If you are starting from scratch, design and construct with our drafting team takes the home from first sketch to keys. If your plans are still in progress with your own architect or designer, we step in before the documentation is locked in to bring construction thinking to the table.