Listed building consent in Wales and the role of Cadw
Wales requires a heritage impact statement with every listed building consent application as a matter of law, and it kept conservation area consent when England abolished it. The Welsh route explained.
Listed building consent in Wales follows a different route from England, and the difference that catches people first is documentary. Every application for listed building consent in Wales has to be accompanied by a heritage impact statement. That is a statutory requirement introduced by the Historic Environment (Wales) Act 2016, not a local validation preference, and an application without one will not get far.
The rest of the Welsh regime looks familiar at first glance because the Planning (Listed Buildings and Conservation Areas) Act 1990 still supplies the framework. The 2016 Act, Welsh regulations and Welsh policy then change enough of the detail to make an England checklist unreliable.
Who designates and who decides
Welsh Ministers list buildings in Wales, advised by Cadw, the Welsh Government's historic environment service. Designations are published on Cof Cymru, the national historic assets of Wales record, which is where you check a grade and a list entry rather than the English national list.
Grades run I, II* and II as they do in England. The decision on an application, though, is taken by the local planning authority: one of the 25 Welsh planning authorities, including the three National Park authorities. Welsh Ministers retain call-in powers and decide some cases themselves.
Appeals go to Planning and Environment Decisions Wales, which took over the Welsh casework from 2021. Anyone used to lodging appeals through the English system needs to use the Welsh service and the Welsh forms.
The heritage impact statement is mandatory
This is the point to get right. In Wales a heritage impact statement accompanies the application as a matter of law, and it has a prescribed job: to explain the significance of the listed building, to set out the impact of the proposed works on that significance, and to show how the proposals were arrived at and what alternatives were considered.
Cadw publishes guidance on how these statements should be written, and the structure it expects is worth following literally.
- Describe the historic asset and identify what makes it significant, element by element.
- State the aim of the works and why change is needed.
- Assess the impact of each element of the proposal on each aspect of significance.
- Record the options considered and why the submitted option was chosen.
- Set out mitigation, recording and any enhancement.
The fourth step is the one most applicants skimp on, and it is the one a conservation officer reads hardest. A statement that shows three options tested and rejected for stated reasons is far more persuasive than one that defends a single design after the fact. The same discipline applies to an English heritage statement, though in England it is a validation requirement rather than a statutory one.
Where fabric will be lost or altered, a written and photographic record prepared before the works often forms part of the package. That is the Welsh equivalent of the work covered by historic building recording, and the level of recording should be agreed with the authority rather than assumed.
When Cadw has to be consulted
Local planning authorities have to notify Welsh Ministers, in practice Cadw, about certain listed building consent applications before deciding them. The categories cover applications involving demolition, and applications for works to Grade I and Grade II* buildings.
Two practical consequences follow. Consultation adds time, so build it into the programme rather than treating a Welsh application as an eight week job. And Cadw's comments tend to focus on significance and on the reversibility of the intervention, so a statement that engages with both will usually produce a shorter exchange.
For Grade II buildings the authority's own conservation officer is normally the decisive voice, and a pre-application conversation with that officer is worth more than anything you will get from a guidance note.
Works that need consent, and works that do not
Consent is required for demolition of a listed building, or for its alteration or extension in a manner which would affect its character as a building of special architectural or historic interest. The listing covers the whole building inside and out, and it extends to objects and structures fixed to it and to buildings within the curtilage which have been there since before 1 July 1948.
Routine like for like repair using matching materials and detail does not normally need consent. The word doing the work there is matching. Replacing a slate roof with the same slate, laid the same way, is repair. Replacing it with a different slate, or with a modern underlay arrangement that changes the appearance at the eaves, may not be.
Areas that generate the most disputes in Wales are the same as everywhere else. Window replacement, internal partitioning, removal of plaster to expose stone, insulation of solid walls, and rainwater goods in the wrong material. Breathability matters more than it does in a modern building, and Cadw guidance on the treatment of traditional buildings is explicit about the risks of impermeable interventions.
Conservation area consent still exists
England abolished conservation area consent in 2013 and replaced it with planning permission for relevant demolition. Wales did not.
In Wales, demolishing an unlisted building in a conservation area still requires conservation area consent under the 1990 Act as it applies in Wales. That is a separate application, on a separate form, with its own heritage impact statement. Anyone working across the border should check which regime applies before filling in a form, because the English route will simply be rejected.
Heritage partnership agreements and a longer view
The 2016 Act introduced listed building heritage partnership agreements in Wales. These are agreements between an owner and the authority, sometimes with Welsh Ministers, that grant consent in advance for specified works over a period.
For an estate, a university, a hospital or a landowner with repeated minor works to the same listed building, the agreement removes the drip of individual applications. Setting one up takes real effort and a good conservation management plan behind it, so it suits a portfolio rather than a single cottage. It is a Welsh tool with no exact English twin in everyday use, and it is underused.
Enforcement and unauthorised works
Carrying out works to a listed building without consent, where consent was needed, is a criminal offence under section 9 of the 1990 Act. That is true in England too, but Wales has added enforcement powers, including temporary stop notices aimed at halting damaging works to listed buildings quickly.
If unauthorised work has already happened, the route back is an application for listed building consent for the works, supported by an honest heritage impact statement that describes what was lost. Concealing it is the one approach that reliably makes matters worse. Authorities can also require works to be reversed by a listed building enforcement notice, and there is no equivalent of the planning time limits that eventually make unauthorised operational development immune.
Readers dealing with the Northern Ireland system will find a different arrangement again, set out in listed building consent in Northern Ireland.
Getting a Welsh application determined
Three things shorten the process more than anything else. Talk to the conservation officer before you design. Commission the heritage impact statement early enough that it can change the scheme rather than describe it. And submit drawings that show existing and proposed at a scale where the joinery detail is legible.
PlanScope's drafting is grounded in the National Planning Policy Framework and English local plans, so a Welsh application needs Planning Policy Wales, Technical Advice Note 24 on the historic environment and Cadw guidance checked by the reviewer before submission. 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 rather than legal advice. Check the position with your local planning authority or a qualified professional before relying on it. Browse the PlanScope report types to see what a heritage scheme usually needs alongside the statement.
Frequently asked questions
Is a heritage impact statement compulsory in Wales?
Yes. Following the Historic Environment (Wales) Act 2016, an application for listed building consent in Wales must be accompanied by a heritage impact statement. It has to explain the significance of the building, the impact of the works on that significance, and the options considered. This is a statutory requirement rather than a local validation preference.
Who lists buildings in Wales?
Welsh Ministers designate listed buildings in Wales on the advice of Cadw, the Welsh Government's historic environment service. Designations are published on Cof Cymru, the national historic assets of Wales record. Grades run I, II star and II, and the local planning authority usually decides applications for consent.
Does conservation area consent still exist in Wales?
Yes. England replaced conservation area consent with planning permission for relevant demolition in 2013, but Wales kept the separate consent. Demolishing an unlisted building in a Welsh conservation area needs conservation area consent, with its own application form and its own heritage impact statement.
When does Cadw comment on an application?
Local planning authorities must notify Welsh Ministers, in practice Cadw, about applications involving demolition and about works to Grade I and Grade II star buildings. Consultation adds time to the determination period. Cadw comments usually focus on significance and on whether the intervention is reversible.
What is a listed building heritage partnership agreement?
It is an agreement introduced in Wales by the 2016 Act between an owner and the authority, which can grant consent in advance for specified works over a period. It suits estates, institutions and landowners with repeated minor works to the same building, and needs a conservation management plan behind it.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.