The Hills and North West are among the fastest-changing parts of Sydney. Older acreage is giving way to subdivisions, established suburbs are seeing knock-down rebuilds, and remnant native trees sit right in the middle of it all. Synertree provides independent arborist reports, Arboricultural Impact Assessments (AIAs) and project arborist services across the region. Arborist reports and AIAs start from $880 + GST (AIAs for one tree), with fixed quotations within 24 hours.
Arborist reports from $880 + GST · AIAs from $880 + GST for one tree · Fixed quotations within 24 hours · All reports are completed by an AQF Level 5 or AQF Level 8 Arborist
What's included in an AIA from $880 + GST (one tree): a basic development proposal. We supply our captured tree data to your architect and landscape architect, and their plans show the tree retention and removal plan. ArborCAD Tree Protection Plans aren't included. ArborCAD Tree Protection Plans and larger or complex sites are quoted separately on your plans, with a fixed quotation within 24 hours.
Castle Hill, Baulkham Hills, Bella Vista, Norwest, Kellyville, Kellyville Ridge, Stanhope Gardens, Glenwood, Rouse Hill, Beaumont Hills, North Kellyville, Box Hill, Glenhaven, Dural, Kenthurst, Annangrove, Galston, Cherrybrook, West Pennant Hills, Pennant Hills, Hornsby Heights, Beecroft, Cheltenham, Epping, Carlingford, North Rocks, North Parramatta, Winston Hills and the surrounding suburbs.
We work across the following council areas:
Our AIAs and arborist reports are prepared to suit each council's DA tree requirements, and to AS 4970:2025.
Subdivisions and multi-lot sites. Splitting a large block, or developing several lots at once, can affect dozens of trees. A clear, accurate tree survey is the starting point. We can locate every tree with survey-grade GNSS (Trimble DA2) to 1 cm accuracy and prepare an ArborCAD Tree Protection Plan that shows which trees are kept, how they're protected and where roads, services and building envelopes can go.
Remnant native trees. Parts of the region still hold remnant eucalypts such as Sydney Blue Gums, Grey Gums, Ironbarks and Turpentines, scattered through paddocks, backyards and road reserves. These trees often have high retention value. Our AIAs assess them carefully to AS 4970:2025. Where a site may also need ecological input, we'll flag it at the start so your programme isn't delayed.
Shale clay soils. Much of the region sits on heavy shale-derived clay. Roots in clay behave differently from roots in sand. Compaction from machinery, changed drainage and cut and fill can harm trees quickly. Our protection specifications focus on ground protection, access routes and drainage, not just fencing.
Long driveways and services. On larger and rural-residential blocks, the driveway, water, sewer and power trenches often travel further than the house footprint. They're a common cause of root damage. We map service routes against Tree Protection Zones and recommend alternatives such as boring under root zones.
Dams, slopes and bushland edges. Properties near bushland, creeks and farm dams bring stability and bushfire considerations. QTRA and ISA TRAQ tree risk assessments help owners understand which trees really need attention.
Street trees in new estates. Newly planted street trees in growing estates are easily damaged during housing construction. Project arborist inspections help builders meet their tree protection conditions and avoid costly replacements.
Q: Which council areas do you cover in the Hills and North West?
A: We work across The Hills Shire, Hornsby Shire, the City of Parramatta and Blacktown City council areas, with reports prepared to suit each council's DA tree requirements.
Q: Do I need a tree survey for a subdivision?
A: Usually, yes. Council will want to know which trees are affected and how the retained trees will be protected. We provide the survey, the AIA and the Tree Protection Plan together.
Q: Can you locate trees accurately on a large block?
A: Yes. We use survey-grade GNSS (Trimble DA2) to locate trees to 1 cm accuracy.
Q: Will trenching for services damage my trees?
A: It can. We map service routes against Tree Protection Zones and recommend alternatives such as boring under root zones or rerouting.
Q: How much does an AIA cost in the Hills and North West?
A: From $880 + GST for one tree on a basic development proposal. We supply our captured tree data to your architect and landscape architect, and their plans show the tree retention and removal plan. ArborCAD Tree Protection Plans and larger or complex sites are quoted separately on your plans, with a fixed quotation within 24 hours.
Email your plans and survey to info@synertree.com.au for a fixed quotation within 24 hours.