You need a tree survey for planning if your development could affect a tree — on your land, a neighbour's, or the public highway — and a survey is close to certain if that tree is protected. If there are no trees within influencing distance of the works, you don't. The difficulty is that "could affect a tree" is broader than most applicants assume: it includes what happens below ground, not just the branches you can see.
The quick three-part test
Ask yourself three questions before you submit anything.
- Is there a tree on or near the site? Include neighbouring trees and street trees, not only your own. A mature tree two gardens away can still be relevant if its roots or canopy reach your plot.
- Could the works affect it? As a working rule, a tree can be affected if any part of the development — foundations, hard surfacing, drainage runs, scaffolding, a crane pad or even soil storage — falls within its root protection area. The RPA is a circle with a radius of 12 times the tree's stem diameter (measured at 1.5 m above ground), so a tree with a 0.5 m trunk projects a root protection area roughly 6 m in every direction.
- Is the tree protected? A Tree Preservation Order or a conservation area makes a survey near-certain — check your postcode first.
If you answered yes to 1 and 2 (or to 3), you almost certainly need a BS5837 tree survey. If you're unsure, it is far cheaper to ask a qualified arboriculturist than to have your application returned unregistered.
When a survey is definitely required
Councils frame the trigger around whether a proposal is "likely to affect trees." In practice that catches far more than new houses. The table below shows common domestic and small-development scenarios and whether a survey is usually expected.
| Scenario | Survey usually needed? | Why |
|---|---|---|
| Rear extension within ~10 m of a mature tree | Yes | Foundations/drainage likely inside the RPA |
| Extension on the opposite side of the plot from any tree | Usually no | No tree within influencing distance |
| New driveway or hardstanding over rooting area | Yes | Compaction and surfacing damage roots |
| New dwelling in a treed garden (backland plot) | Yes | Layout must be shaped around retained trees |
| Loft conversion, no ground works, no nearby tree | No | Nothing affects a tree |
| Any works near a TPO or conservation-area tree | Yes | Statutory protection plus validation |
| Development near a neighbour's overhanging tree | Yes | Off-site RPA extends into the site |
The through-line is below-ground impact. Homeowners fixate on branches, but the RPA — the soil the roots depend on — is what BS5837 is built to protect. Driveways, patios, drains and utility trenches routinely trigger a survey even when no branch is touched.
Two worked examples
A rear extension near a neighbour's oak. You want a single-storey rear extension. The nearest tree is a mature oak in the neighbour's garden, trunk diameter about 0.7 m, so its root protection area radius is roughly 8.4 m (12 × 0.7). Your extension foundations sit 6 m from the trunk — inside the RPA. This needs a BS5837 survey, an Arboricultural Impact Assessment of your actual layout, and probably an Arboricultural Method Statement specifying a no-dig or engineered foundation. See our guide to tree surveys for home extensions.
A new driveway over a street tree's roots. You are dropping a kerb and laying a driveway. A council-owned street tree stands on the verge. The rooting area extends under your proposed hardstanding. Even though you are not touching the tree itself, the compaction and excavation put you inside its RPA — so a survey and a no-dig construction approach are expected. Our driveway and hardstanding guide covers this in detail.
Three separate sources of compulsion
It helps to understand why you might be forced to provide arboricultural information, because the three routes are distinct and behave differently:
- Local validation requirement. Your council will not register the application without the documents its checklist demands. Miss them and the application is returned as invalid — you never reach determination.
- Planning condition. Permission can be granted subject to a pre-commencement condition requiring an impact assessment, tree protection plan or method statement to be discharged before works begin.
- Statutory protection. A TPO or conservation area is a criminal-law regime entirely separate from your planning application. Planning permission alone does not let you touch a protected tree — consent is a distinct process.
Crucially, BS5837:2012 is guidance, not law. It sets the method; the compulsion comes from these three sources.
When you probably don't need one
You can usually skip a survey where there is genuinely no tree within influencing distance — for example a loft conversion, an internal remodel, or an extension on the side of the plot furthest from any tree, with no ground works near rooting areas. If in doubt, a short pre-application conversation with the council's tree officer, or a quick opinion from a consultant, settles it cheaply. Don't guess: a wrong "no" costs far more than a survey.
Requirements are set locally — check your council
There is no single national rule that says "a BS5837 survey is required." The requirement lives in each local planning authority's validation checklist, and the exact trigger wording, distance thresholds and how strict the tree officer is in practice all vary between councils. One authority may demand a full impact assessment, tree protection plan and method statement at validation; a neighbouring one may accept a survey alone and condition the rest. Local factors — TPO density, conservation-area coverage, the presence of ancient or veteran trees — push the bar higher in some areas than others.
So the safest step before you submit is to read your authority's validation requirements. See which LPAs require a tree survey, then start at the tree-surveys hub and check example authorities such as Leeds, Manchester or Lambeth. PlanWatch tracks live tree-related planning activity per council, so you can see how your authority is treating trees — and whether a nearby tree is already flagged — before you spend a penny. If you are in Scotland, Wales or Northern Ireland, note the statutory framework differs from the England-centric position described here, even though BS5837 applies UK-wide.
What happens if you skip it
Councils increasingly reject applications at the validation stage for a missing tree survey — which means you haven't even reached the planning queue. The application is returned, you lose the weeks it took to get there, and you start again. Even if it slips through validation, the survey often reappears as a pre-commencement condition, so you pay for it anyway but later and under time pressure. Submitting the survey up front keeps your application moving and is the cheapest route overall. If your application has already been bounced, read what to do when a tree survey is rejected at validation.
Be sure before you submit
If any tree could plausibly be affected, get a BS5837 tree survey done early — ideally before the design is fixed, so the trees shape the layout rather than colliding with it. Read our guide to the BS5837 survey process to see what the work involves, and how much a tree survey costs to budget it. A few hundred pounds spent up front is almost always cheaper than a refused or invalidated application.