Replacement Planting Calculator — NSW Council DCPs
A free interactive calculator that estimates how many replacement (offset) trees you’ll need to plant when removing protected trees under your council’s Development Application conditions. Built for NSW — with specific support for Hunter Region LGAs.
Council / LGA
Pick the LGA the trees are on. The NSW general rule applies as the default; specific Hunter Region councils may have additional notes layered in. If your council isn’t listed, leave on NSW general — your project arborist will confirm the exact local rule.
Trees being removed
Enter every protected tree the proposed works will remove. The calculator scales replacement count and pot size against each tree’s DBH (trunk diameter at 1.4 m). Significant trees (heritage-listed, hollow-bearing, locally rare species, or council-listed) double the replacement count.
Download your result as a PDF
Enter your details to download a branded PDF of this replacement-planting schedule. Use it as a project file note, share with your builder or architect, or attach to a quote request for a full Arboricultural Impact Assessment.
Why this matters. Councils almost always make replacement plantings a condition of consent on any DA that removes protected trees. Get this wrong and your DA can be refused or hit with an RFI delay. Get it right and the planting becomes a normal line item your landscaper picks up at construction. The exact rule varies by LGA and tree category — this calculator gives you a defensible starting estimate using common NSW DCP patterns; the formal schedule goes in your AIA.
Disclaimer & conditions of use
Purpose. This calculator is an educational tool that estimates likely replacement-planting requirements using common NSW council DCP patterns. It is provided for information only.
Not professional advice. Output from this calculator is not an arboricultural opinion, not a report, and not a substitute for your council’s actual Development Control Plan or your project arborist’s formal replacement-planting schedule. The exact replacement requirements — number of trees, species selection, pot sizes, planting locations, soil preparation, watering establishment, maintenance period, bonding — are set by your local council’s DCP and finalised by your project arborist in the formal Arboricultural Impact Assessment that accompanies your DA.
Council DCPs vary. Each NSW LGA has its own Tree DCP, Vegetation DCP or equivalent. Some councils use a flat 1:1 replacement; some scale by removed-tree DBH or canopy; some apply enhanced ratios for significant or heritage-listed trees; some require a specific local-provenance species list; some require a Tree Protection Bond. This calculator approximates common patterns but cannot guarantee accuracy for every LGA.
Inputs. Results are only as accurate as the measurements you enter. Trunk diameter at breast height (1.4 m above ground on the high side of any slope) must be measured to AS 4970-2025 methodology. The “significant tree” flag is a user judgement — the project arborist will assess significance formally using IACA STAR or council’s significance criteria.
Cost estimates. Material cost ranges are indicative ballpark figures for the plant stock only. They exclude planting labour, ground preparation, irrigation establishment, mulch, tree stakes/guards, replacement-of-failures, post-planting maintenance period, and any structural work (tree pits, root barriers). Your landscape contractor will quote the installed cost separately.
No warranty, no liability. Provided “as is” without warranty of any kind. To the maximum extent permitted by law, Assurance Trees Pty Ltd accepts no liability for any loss or damage arising from use of or reliance on this calculator.
For any actual DA, engage a qualified consulting arborist — an AQF Level 5 (or higher) practitioner experienced with your local council, such as Assurance Trees on 1300 859 510 or sales@assurancetrees.com.au.
Need the formal planting schedule for your DA?
The Arboricultural Impact Assessment (AIA) that goes with your DA specifies the exact replacement plantings council will require — species, pot sizes, planting locations, soil preparation, watering establishment, and the maintenance / replacement-of-failures period. AIA from $1,800 + GST — see what’s included or call 1300 859 510.
How NSW councils calculate replacement plantings
Most NSW Local Government Areas adopt some variant of four common patterns. The right one for your DA depends on which council you’re in and which category your tree falls under in the council’s register.
Flat 1:1 ratio
One new tree planted for every protected tree removed. Used by many smaller and regional councils. Simplest rule, but minimum pot size and species selection still apply.
DBH-tiered
Replacement count scales with the removed tree’s trunk diameter at breast height (DBH). Larger trees require more replacements — the principle being to replace lost mature-canopy capacity over time. The default formula this calculator uses.
Significance-weighted
“Significant” trees — heritage-listed, hollow-bearing, locally rare species, register-listed — trigger enhanced ratios, often 2:1 or 3:1. Standard trees stay at 1:1 or DBH-tiered.
Canopy-replacement (MCR)
Some progressive councils calculate based on the projected mature canopy area lost, replaced with the projected mature canopy of the new plantings. Species-specific. Used by City of Sydney and a small number of others.
The calculator’s default formula. When you leave the council on “NSW general”, the calculator applies a defensible DBH-tiered approach common across most NSW LGAs: 1 replacement for trees under 100 mm DBH, scaling to 4+ replacements for trees over 1200 mm DBH, with significant trees doubled. Pot size scales from 25 L for small trees to 100 L+ advanced specimens for very large ones. Hunter Region LGAs have additional notes layered in where Aaron has captured the specific local rule.
What goes in an AIA’s formal planting schedule
This calculator estimates the count and pot size. The Arboricultural Impact Assessment that accompanies your DA specifies the full requirement that council will assess and condition:
- Species selection. Drawn from the council’s preferred / endemic species list for the site’s vegetation community, with proven establishment in your soils and microclimate.
- Planting locations. Marked on the site plan, with consideration of overhead clearances, underground services, building setbacks, and future maintenance access.
- Pot size and stock specification. Minimum container size, height at planting, root-ball quality, stake/guard requirements.
- Ground preparation. Subsoil decompaction, pit dimensions, soil amendment, drainage management, mulch specification.
- Establishment regime. Watering schedule for the first two summers, weed management, formative pruning, replacement-of-failures within the maintenance period.
- Bonding / surety. Some councils require a Tree Protection Bond held until the establishment period (commonly 2–5 years) is complete and the project arborist signs off on planting survival.
Without this detail your council will issue an RFI or refuse the DA — “replacement plantings as required by council” doesn’t pass assessment in 2026.
Frequently asked questions
Why do NSW councils require replacement plantings?
Most NSW councils protect existing canopy as a planning objective — they want to maintain or grow the urban forest over time. When a Development Application removes protected trees, the council imposes replacement plantings as a condition of consent to offset the canopy loss. Without compliant replacement plantings on the construction certificate, the development can’t legally proceed.
How do I know which trees on my site are “protected”?
Each NSW LGA defines its own protected-tree threshold in its Tree DCP or Vegetation DCP. Common thresholds include trees over a certain height (often 3 or 5 m), trunk circumference (often 30 cm at 1 m above ground), or any tree on a specific significant-tree register. Some councils also protect everything inside heritage-conservation areas. Your project arborist confirms protection status as part of the AIA.
What is a “significant” tree?
Significant trees attract enhanced replacement ratios. Common significance triggers across NSW councils: heritage listing (state or local), hollow-bearing trees (habitat for native fauna), locally indigenous species in good condition, trees of unusual size or age, trees on a council’s significant-tree register, and trees identified as significant by IACA STAR assessment. The project arborist makes the formal significance determination.
How big do the replacement trees have to be?
Pot size requirements vary by council but a defensible starting point is: 25 L for replacements of small trees, 45 L for medium trees, 75–100 L for replacements of large trees, and 200 L+ advanced specimens for replacements of very large or significant trees. Some councils specify minimum heights instead of (or in addition to) pot size. The calculator scales pot size against removed-tree DBH.
Can I plant the replacements anywhere on the site?
No. Council requires the project arborist to specify planting locations on the site plan, with regard to overhead clearances, underground services, building setbacks, future canopy spread at maturity, and ground conditions. Off-site offsets are allowed by some councils where the site genuinely cannot accommodate them — usually contributed to council’s urban-forest planting fund.
What if I remove a tree without DA approval?
Unauthorised removal of a protected tree is an offence under the Local Government Act and the council’s LEP/DCP, with penalties commonly $3,000–$15,000+ per tree (and significantly higher for state-significant trees or commercial-scale clearing). Councils can also issue a Tree Replacement Order requiring you to plant a much larger number of trees as a remediation condition. Do not remove protected trees without consent.
Does this calculator replace an Arboricultural Impact Assessment?
No. It estimates the replacement-planting count and pot size for budgeting and scoping. The formal schedule that goes in your DA — species, locations, soil prep, establishment regime, bonding — is specified by your project arborist in a formal Arboricultural Impact Assessment. Assurance Trees provides AIAs from $1,800 + GST — see what’s included.
Do all 10 Hunter Region LGAs have the same rule?
No — each has its own DCP. The calculator includes specific notes for the 10 Hunter LGAs where Aaron works most often (Newcastle, Lake Macquarie, Maitland, Port Stephens, Cessnock, Dungog, Singleton, Muswellbrook, Upper Hunter, MidCoast). Other NSW councils use the “NSW general” default. If your specific LGA has a quirky rule we haven’t captured yet, the AIA we write will apply the exact local DCP.
How accurate is the cost estimate?
The cost estimate is plant-stock-only, in indicative ranges. 25 L stock is typically $40–$80 each, 45 L $80–$150, 75 L $150–$250, 100 L $250–$400, 200 L advanced $800–$2,000+. Species, supplier, season and quantity all affect the actual price. Installed cost (delivery, planting labour, soil prep, stakes, mulch, establishment watering, 2-year maintenance period) typically adds 1–3× the plant-stock cost. Your landscape contractor will quote installed.
Definitions — key terms
Terms used on this page, drawn from common NSW council DCP language and the arboricultural literature.
- Replacement / compensatory / offset planting
- The new trees a council requires you to plant when removing protected trees under a Development Application. Used interchangeably with “compensatory planting” and “offset planting”. The aim is to replace lost canopy capacity over time.
- DBH — Diameter at Breast Height
- Trunk diameter measured at 1.4 m above natural ground level, taken on the high side of any slope. The calculator scales replacement count and pot size against the removed tree’s DBH.
- Significant tree
- A tree triggering enhanced replacement ratios under council DCP. Common significance markers: heritage listed (state or local), hollow-bearing, locally indigenous species in good condition, on council’s significant-tree register, or assessed as significant under IACA STAR. The project arborist makes the formal determination.
- Council DCP — Development Control Plan
- The council planning document that sets out development controls for the LGA, including tree protection and replacement rules. Each NSW LGA has its own. Where a Tree DCP isn’t standalone, the rules are typically inside the Vegetation DCP or the main LEP-supporting DCP.
- 10/50 vegetation clearing
- NSW Rural Fires Act allowance permitting removal of trees within 10 m of a dwelling on bushfire-prone land (or vegetation within 50 m for non-tree clearing). The 10/50 rule does NOT override council tree controls in many situations; check with council before relying on it.
- Mature Canopy Replacement (MCR)
- Replacement principle that requires the new plantings, at projected mature size, to deliver at least the canopy area that was lost. Species-specific calculation. Used by progressive councils including City of Sydney; less common in regional NSW.
- Pot size / container size
- The volume of the root-ball container at supply. Larger pots = larger / older plants at supply = faster establishment but higher cost and slower transport-handling. Common sizes for replacement plantings: 25 L (~1.5 m tall), 45 L (~2 m), 75 L (~2.5 m), 100 L (~3 m), 200 L+ advanced specimens (3–5 m).
- Establishment period
- The 2–5 year window after planting during which the trees require active management (watering, weed control, formative pruning, replacement of failures) and council inspection. Many councils require a Tree Protection Bond held until the project arborist signs off on planting survival at the end of the establishment period.
- Tree Protection Bond
- Money the council holds in trust until protected trees on the site survive construction AND any replacement plantings survive the establishment period. Forfeited if trees die or are removed without consent. Common amount: $1,000–$5,000+ per protected tree, varies by council.
- RFI — Request for Further Information
- Council’s formal request mid-assessment for more / better information. RFIs typically add 2–6 weeks to a DA timeline. A common RFI on tree-affected DAs is “please specify the replacement plantings in detail per our DCP” — which is what a proper AIA prevents.
- AIA — Arboricultural Impact Assessment
- The formal report your DA needs when works affect protected trees. Specifies the impact on each tree, retention or removal decisions, Tree Protection Zone management for retained trees, and the formal replacement-planting schedule for removed trees. Drives council consent.
Need the formal planting schedule for council?
Assurance Trees writes council-ready Arboricultural Impact Assessments for NSW developments. The AIA includes the formal replacement-planting schedule that council will assess and condition. Licensed NSW Builder + AQF Level 5 Consulting Arborist. From $1,800 + GST.
1300 859 510or email sales@assurancetrees.com.au — 24-hour quote turnaround.
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