Map the site and price each landscape system

Start with an area plan, not a blended rate

The calculator checks that hardscape, living lawn and garden beds do not exceed the entered site area. The remainder can represent retained vegetation, gravel, buildings, water, service zones or work outside this budget. Label it on a plan so unallocated area is not silently forgotten.

Measure surfaces in plan view and avoid overlaps. A tree planted in a garden bed belongs in the bed area and plant count; do not add a second area for its canopy. Paths within garden beds should be separated if they use a hardscape rate. Calculate front, rear and side zones independently when access or specification differs.

A blended dollar-per-square-metre rate can conceal a small expensive paved area inside a large low-cost planted area. Here, hardscape, lawn, soil, mulch, plants and irrigation each have a traceable quantity. Replace allowances with drawings and schedules as design develops.

Soil and mulch volumes come from compacted design depth

Soil volume equals garden bed area multiplied by entered depth. Mulch uses the same bed area and its own depth. These are geometric placed volumes. Supplier ordering may need allowance for settlement, compaction, irregular levels or bulk-density charging.

Do not import soil without understanding existing conditions, drainage and plant needs. Soil texture, structure, pH, salinity, contamination, nutrients and organic matter affect whether amendment, removal or specialist advice is appropriate. Adding a thick layer over poorly drained ground can create waterlogging rather than a healthy root zone.

Keep finished soil and mulch levels clear of damp-proof courses, weep holes, cladding, termite inspection zones and tree trunks. Allow for settlement below paths and edging. Confirm source quality and biosecurity requirements for imported material.

Mulch type affects fire, wind, pets, maintenance and nutrient behaviour. It can suppress weeds and reduce evaporation, but it does not eliminate establishment watering or weeding. Price replenishment separately when comparing whole-life options.

A plant count needs a species, size and establishment schedule

The average plant rate is useful at concept stage, but one advanced tree can cost more than many tubestock plants. Build a schedule with botanical name, local suitability, pot size, mature dimensions, quantity, supplier, staking, guards, soil preparation and warranty or replacement terms.

YourHome explains that landscape design can improve amenity, thermal performance, water management, biodiversity and habitat. Place deciduous shade, evergreen screening and wind protection according to climate and building orientation. Avoid roots that threaten structures, services or drainage.

Low-water-use and locally appropriate species can reduce irrigation demand after establishment. That does not mean newly planted material needs no water. Include establishment duration, monitoring and replacement responsibility in the contract. A plant warranty may depend on an operational irrigation and maintenance programme.

Protect retained trees and root zones during excavation, storage and traffic. Council approval may be required before pruning or removal. An arborist can define protection and construction methods where important trees interact with work.

Integrate irrigation with stormwater and climate

Irrigation cost is applied to the entered served area, which may include lawn and beds but should not automatically include hardscape. Use a plan showing hydrozones, pipework, valves, filters, controls, backflow protection, water source and sleeves beneath paths. Confirm pressure and flow before final design.

YourHome’s stormwater guidance promotes slowing, filtering and using water on site while accounting for soil, slope, groundwater and local rules. Minimise unnecessary impervious surfaces and direct lawful overflow away from buildings and neighbours. Raingardens, swales, permeable paths, tanks and planted infiltration can form one system.

Rainwater or permitted recycled water may reduce potable demand, but quality, storage, controls and signage require suitable design. The landscape drainage allowance can cover pits, pipes, grading, subsoil drainage, erosion control and lawful connection only when the quoted scope includes them.

Hardscape cost depends on the layers below the finish

The hardscape rate should identify demolition, excavation, disposal, base, compaction, reinforcement, bedding, surface, joints, drainage, edges, steps and sealing. A paver price is not an installed path price. Heavy vehicles, pool surrounds, accessible paths and ordinary garden stepping areas require different systems.

Coordinate falls and thresholds before work. Paving can block weep holes, bridge damp-proof courses or direct water at the home if levels are raised. Surface selection should consider slip, heat, glare, maintenance and expected loading.

YourHome advises limiting excessive paving because hard surfaces can increase microclimate heating and reduce permeability. Use hardscape where it supports circulation and use, and consider recycled or reused site material when suitable. Design disassembly and repair can reduce future replacement waste.

Earthworks and access can dominate a garden project

Site preparation may include clearing, demolition, service locating, cut and fill, retaining, rock excavation, contaminated soil, haulage and imported material. Measure these separately rather than hiding them in planting rates. Verify legal disposal and keep sediment out of streets and stormwater.

Restricted side access can require hand excavation, small plant, cranes or material pumps. Protect the home, fences, neighbours, trees and completed surfaces. Programme heavy earthworks before delicate planting and allow space for stockpiles without compacting future root zones.

Lighting, edging, fences, screens, pergolas, seats, water features and outdoor kitchens sit in the features allowance. They may involve structural, electrical, plumbing, gas, pool-barrier, fire or approval requirements. Replace the single number with a schedule before tender.

Compare landscape quotations against one plan

Issue the same current plan, levels and schedules to every bidder. Confirm licences, insurance, approvals, service locating, protection, programme, establishment watering, plant replacement, defects, GST and exclusions. A supply-only nursery quote cannot be compared with an installed landscape contract.

Design fees are calculated as a percentage of direct landscape works before the separate approval allowance. Contingency applies after both. GST is added only when selected. The total per site area includes unallocated land and fixed works, so it is a project scale measure rather than a national landscape rate.

Fund establishment and long-term maintenance

A newly installed garden is not mature at practical completion. Agree an establishment period with watering, weeding, mowing, pruning, pest monitoring, irrigation adjustment and replacement. Define performance checks and who pays for loss caused by system failure, weather or poor care.

Retain plant schedules, soil information, irrigation plans, controller settings, drainage locations, approvals, warranties and product data. Photograph buried pipes and sleeves. Mark isolation valves and keep drains accessible.

Model ongoing water, electricity, mulch, pruning and replacement separately. A lower-capital design can have higher maintenance, while a climate-responsive landscape can improve shade and comfort. Choose the programme the household can sustain, not only the lowest installation total.