Reports for a rear extension to a Grade II listed house

A rear extension to a Grade II listed house needs two consents, not one, and the listed building extension reports that support them are different documents doing different jobs. You will be applying for householder planning permission and for listed building consent under the Planning (Listed Buildings and Conservation Areas) Act 1990, usually on the same day. The document set is driven by the second application, because that is where the council has a statutory duty to have special regard to preserving the building and its special interest.

The good news for a householder is that this is a short list. Four documents will carry most cases. The expensive specialist surveys that dominate larger schemes mostly do not apply.

Two applications, one submission

Listed building consent is required for works that affect the character of the building as a building of special architectural or historic interest. That covers internal alterations as well as external ones, which is why knocking through a rear wall to connect the new extension is often the part that needs most justification, rather than the extension itself.

Planning permission is a separate question. Listing does not automatically remove permitted development rights for an extension, so it is worth checking whether the works would fall within Schedule 2 Part 1 of the General Permitted Development Order before assuming a householder application is needed. In practice most councils prefer both applications and most agents submit both, because a permitted development argument that fails leaves you with unauthorised works on a listed building, which is a criminal offence rather than a planning breach.

There is no fee for a listed building consent application. The householder planning fee is set nationally and indexed each April, so check the current fee schedule on the Planning Portal before budgeting.

The heritage documents the council expects

Two documents do the heavy lifting.

A Heritage Statement, sometimes called a statement of heritage significance, describes what is special about the building, identifies which parts of it carry that significance, and then assesses the effect of the proposal on it. The NPPF, in its August 2026 edition, asks applicants to describe the significance of any heritage asset affected in detail proportionate to its importance. For a Grade II house that means understanding the building's phases, its plan form and which internal features are original.

A Design and Access Statement is a statutory requirement for every listed building consent application, whatever its size. This is the one people miss. A householder extension to an unlisted house needs no DAS at all, so applicants who have done this before assume the same applies here and get the application returned as invalid.

The two overlap and should be written to complement each other rather than repeat. The heritage statement explains the building. The design and access statement explains the response.

Most councils also ask for existing and proposed plans and elevations at 1:50 or 1:100, a site location plan at 1:1250, and detailed drawings of any new or altered openings, joinery and rainwater goods at 1:5 or 1:20. Those large-scale details are where listed building applications most often stall.

When a recording condition is likely

Where the works will remove or conceal historic fabric, the council's conservation officer may ask for Historic Building Recording before work starts, secured by condition. Historic England describes four levels of recording, from a basic visual record at Level 1 to a full analytical record at Level 4.

For a modest rear extension on a Grade II house, a Level 2 record of the affected elevation and the rooms being altered is the usual ask. The trigger is usually the removal of a rear wall, the loss of an outbuilding or the alteration of a historic roof structure.

Ask the conservation officer at pre-application stage whether a recording condition is expected. Commissioning it in advance costs less than discovering after permission that you cannot start until a specialist has visited.

Structural evidence for new openings

If the proposal forms a wide opening in a historic rear wall, expect a request for structural information: what is carrying the load now, what will carry it afterwards, and how the intervention is reversible. A Structural Survey by a structural engineer covers this, and on older buildings it may also flag lime mortar, timber lintels or a shallow foundation that changes the design.

This is not a planning document in the strict sense. It is evidence that persuades a conservation officer the intervention has been thought through, and it saves an argument at the building control stage later. On a basement or lowered floor level the structural evidence becomes far more involved, and we have set out that heavier document set in a separate piece on reports for a residential basement excavation.

Trees and drainage on a mature plot

Listed houses tend to sit in older gardens with mature trees, and the trees are frequently protected by a Tree Preservation Order or by conservation area status.

If any tree within roughly 15 m of the works could be affected, a Tree Survey to BS 5837:2012 will establish root protection areas and show whether the extension footprint or its foundations encroach on them. Where the extension sits within a root protection area, expect a request for no-dig foundation details.

Drainage is simpler but still catches people out. A rear extension over an existing soakaway, or across a private drain serving the house, needs the connection strategy shown on the drawings. Where a public sewer crosses the garden, the water undertaker's build over agreement is a separate consent from the council's decision and runs on its own timetable.

What you will not need

This is the useful half of the answer.

That last row is the exception worth taking seriously. Older roofs with lifted tiles, gable access or a slate roof over an unlined void are plausible bat habitat, and if the works touch the roof structure the council can and does ask for a preliminary roost assessment. Bats are a protected species and survey seasons run from May to September for emergence surveys, so a late discovery can push a project by several months.

The Community Infrastructure Levy rarely bites either. Extensions of less than 100 m² of new floorspace are treated as minor development for levy purposes, and an owner extending their own home can claim the residential extension exemption before starting work.

Assembling the pack in order

1. Measure the building and produce accurate existing drawings, including a measured survey of the rear elevation.
2. Commission the heritage statement early, because what it finds should shape the design rather than justify it afterwards.
3. Take pre-application advice from the conservation officer, with a sketch rather than a finished scheme.
4. Develop the design, then write the design and access statement against the final drawings.
5. Add the tree survey and structural information only if the pre-application response or the site conditions call for them.
6. Submit planning and listed building consent applications together, with matching drawings and matching drawing numbers.

Step six sounds trivial and is the most common cause of a validation query. The two applications are read by different teams and drawing numbers that do not match across them will bounce.

Enter your postcode on PlanScope to see which reports the site is likely to need, and draft the heritage statement and design and access statement together so the two documents actually agree with each other. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.

This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it.