Documents for a rear extension next to a listed neighbour

If the house next door is listed and yours is not, you do not need listed building consent for your rear extension. What you do need, if the extension requires planning permission at all, is enough heritage evidence for the council to discharge its statutory duty towards the setting of that listed building. For most single storey rear extensions on a suburban plot that means a location plan, a block plan, existing and proposed drawings, photographs and a heritage note of two or three pages. Not an archaeological study, not a townscape assessment.

Start by checking whether you need permission in the first place. A neighbour's listing does not remove your permitted development rights under Schedule 2 Part 1 Class A of the General Permitted Development Order 2015. Those rights are cut back on article 2(3) land, which means conservation areas, National Parks, National Landscapes and World Heritage Sites, and by any Article 4 direction the council has made. Being next to a listed building is none of those things.

Why the neighbour's listing changes your application

Listing protects the building, anything fixed to it and, in many cases, structures within its curtilage. Your house is a separate planning unit with its own curtilage, so works to it fall outside that control. The listing reaches you through a different route: the effect of your proposal on the setting of the listed building.

Setting is not the same as the plot boundary. It is the surroundings in which a heritage asset is experienced, and it can extend well beyond the neighbouring garden fence. A rear extension that is invisible from the street can still sit in the setting if it is visible from the listed building's rear elevation, from its garden, or in a view that includes both buildings together.

The practical consequence for you is narrow but real. The council cannot treat your application as a routine householder case. It has to record how it considered the setting, which means it needs something in the file to consider.

The setting duty in section 66 and what it asks

Section 66(1) of the Planning (Listed Buildings and Conservation Areas) Act 1990 requires the local planning authority, when deciding an application that affects a listed building or its setting, to have special regard to the desirability of preserving the building, its setting and any features of special architectural or historic interest it possesses.

Special regard is a high bar. The courts have read it as requiring considerable importance and weight to be given to any harm, which means a council cannot simply balance a small amount of heritage harm against the benefit of a bigger kitchen and call it even. Harm to setting, even limited harm, has to be justified.

That sounds alarming until you remember the other half of the test. If your extension causes no harm to the setting, the duty is satisfied and the application proceeds on ordinary amenity and design grounds. Most rear extensions behind an existing building line, at single storey, in materials matching the host dwelling, cause no harm at all. The job of the heritage note is to demonstrate that rather than to assert it.

The current National Planning Policy Framework, re-issued on 17 August 2026 with policy-coded chapters in place of the old paragraph numbers, carries the requirement that applicants describe the significance of any heritage asset affected, including any contribution made by its setting, in detail proportionate to the asset's importance and no more than sufficient to understand the potential impact. Check the policy reference in the current edition on gov.uk before quoting it in a submission, because the numbering has changed twice since 2023.

Documents the council will expect

The national requirements for a householder application are short. Everything beyond them comes from the council's own local validation list, which is where an adjacency-to-listed-building trigger usually lives.

Download the council's validation checklist before you draw anything. Councils differ on whether a heritage statement is demanded for every site within a set distance of a listed building or only where an officer judges the setting to be affected, and the difference decides whether your application is validated on the day it arrives or sits in a queue waiting for a further document.

If your own house also sits in a conservation area, the document set grows and the permitted development position changes, which is covered separately in our guide to the reports needed for a house in a conservation area.

What a short heritage note has to cover

A proportionate note for a rear extension next to a Grade II listed neighbour runs to roughly 800 to 1,500 words and does five things in order.

1. Identify the asset. Give its name as it appears on the National Heritage List for England, the list entry number and the grade. Quote the relevant part of the list description rather than the whole entry.
2. Describe its significance. Say what makes the building interesting: its date, its form, surviving original fabric, its historic association with the area. Two or three paragraphs.
3. Describe the setting and how it contributes. Historic England's guidance on the setting of heritage assets sets out a stepped approach, and the step that matters most here is identifying which views and which aspects of the surroundings carry the significance.
4. Describe the proposal in plain terms. Height, depth, position relative to the shared boundary, materials, whether any existing structure is being removed.
5. Assess the effect and conclude. State whether the proposal preserves the setting, and if there is any effect, whether it amounts to harm and at what level.

A heritage statement prepared to that shape gives the case officer something to cite in the report. A note that only says the extension is to the rear and will not be visible gives them nothing, and it is the second version that generates a request for further information three weeks in.

Drawings and photographs that answer the setting question

The drawings do more heritage work than the words. Three additions to a standard householder set usually settle the question.

Put the listed building on the block plan, labelled, with the distance from the nearest part of your extension to the nearest part of the listed building written on the drawing. Officers measure this off the plan anyway, so save them the step.

Add a section or a street elevation that includes both buildings at the same scale, so the relative ridge and eaves heights can be read directly. This is the drawing that answers the question of whether the extension will appear behind, above or alongside the listed building in any view.

Then give three or four photographs: one from the public highway showing both properties, one along the shared boundary, one from the rear of your own garden looking towards the listed building, and one showing the existing rear elevation you are altering. Annotate each with the direction of view on a small location plan.

When a full heritage assessment is worth the fee

Some circumstances justify a proper assessment by a heritage consultant rather than a short note. A Grade I or Grade II* listed neighbour, because the weight attached to harm rises with the grade. A two storey extension, or anything that breaks the existing roofline and becomes visible in a principal view of the listed building. Demolition of a boundary wall or outbuilding that might itself be curtilage listed. A proposal in a garden that was historically part of the listed building's grounds.

Where the council's pre-application service exists, a short written enquiry at that stage is usually cheaper than a refusal. Ask the conservation officer directly what level of heritage evidence they expect, and keep the reply.

Submitting without over-ordering reports

The commonest mistake on these applications is buying too much evidence. Adjacency to a listed building does not trigger an archaeological desk-based assessment unless the site also falls in an area of archaeological interest. It does not trigger a townscape assessment for a single storey rear extension. A design and access statement is not a national requirement for a householder application outside designated areas, though some councils ask for a short design statement anyway.

Order the validation checklist, the heritage note and good drawings. Stop there until the council says otherwise.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it, and remember that a Lawful Development Certificate is the only formal way to confirm that works are lawful without a planning permission. To see which documents a site is likely to need before you commission anything, enter your postcode on PlanScope.

PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.