Sample panel conditions and how to clear them

A sample panel condition on a heritage consent is satisfied on site, in daylight, by someone standing next to the existing wall. That is why it delays schemes more than any other materials condition. A brick sample board approved in an office in January is worth nothing if the panel built in March reads pink against a grey stock wall, and the condition is not discharged until the officer says in writing that it is.

Build the panel early, build it where it can be compared, and treat the mortar as the thing that decides the outcome.

What a sample panel condition actually requires

Read the wording closely, because three versions circulate and they mean different things. One requires samples of materials to be approved before the relevant works begin. One requires a sample panel to be erected on site and approved in writing. One requires the panel to be erected and then retained on site for the duration of the works as a reference standard.

The third version carries an obligation nobody budgets for: a panel that cannot be demolished until practical completion, which means it has to be somewhere it will not be in the way. Check which version you have before the contractor starts clearing the site.

Where the condition is pre-commencement, section 100ZA of the Town and Country Planning Act 1990 requires the applicant's written agreement before it can be imposed on a planning permission. That gives you a negotiating position at the decision stage, discussed further below. Note that the provision applies to planning permissions rather than to listed building consents.

Where to build the panel

The panel has to be comparable with the fabric it will sit against. That means built in the same orientation, within sight of the existing wall, at a similar height where possible, and not under a scaffold sheet that changes the light.

A panel built on the ground against a site hoarding tells you very little about how a wall will read at second floor level on a north elevation. Where the work is at height and comparison matters, build the panel at height on the scaffold, or build two: one accessible for close inspection and one in position.

Practical points that save a return visit. Keep the panel free of mud and overspray. Give it a temporary cover against driving rain while the mortar cures, but take the cover off at least a week before the inspection so the mortar has dried to its final colour. And tell the officer where the panel is, with a plan, because conservation officers visit several sites in a day.

Brick, mortar and bond variables

The condition usually names brick and mortar, but the panel is judged on the whole assembly. Separate the variables so a rejection can be fixed without rebuilding everything.

Mortar is where most panels fail. On a historic solid wall a cement rich mortar is harder than the brick, which concentrates movement and moisture in the masonry rather than the joint, and conservation officers refuse it on principle as well as on appearance. Specify a lime mortar with a named sand, and accept that the sand supplier matters: change pits and the colour changes.

Where the scheme involves plaster or render as well, the same logic applies and the sample is a panel rather than a sample pot. Our note on lime plaster ceilings and listed building consent covers the internal equivalent.

Photographs will not do it

Submit photographs by all means, and expect them to be insufficient. Colour reproduction varies with camera, light and screen, and a conservation officer who approves a wall from a photograph is taking a risk they will not take.

What photographs are good for is the record. Take them with a colour reference and a scale in frame, on an overcast day, from a fixed position, and keep them in the discharge file. They evidence what was approved if a dispute arises later about whether the delivered wall matches the panel.

So plan for a site inspection and ask the authority how it books them. Some conservation teams visit on fixed days, some require two weeks notice, and some will only attend once a formal discharge application has been validated, which adds the eight week determination period to your programme.

Timing against the build programme

Work back from the date the first permanent masonry goes up, and allow for each of these.

1. Sourcing time for the brick, which on a handmade or specially matched product can run to several weeks or months.
2. Delivery of the named sand, which is often the longer lead item because quantities are small.
3. Building the panel.
4. Curing. Lime mortar carbonates slowly and the colour changes as it dries, so allow weeks rather than days before inspection.
5. The authority's inspection and written response.
6. Contingency for one rejection and a second panel.

Season matters. A lime panel built in late autumn risks frost damage before it has cured, and a panel damaged by frost tells the officer nothing useful about the finished wall. Where the programme forces a winter build, protect the panel properly and say in the submission what protection was used.

Illustrative example: a conversion of a Grade II mill requires a sample panel of reclaimed brick in lime mortar. The brick takes seven weeks to source, the named sand two weeks, the panel is built in early April, inspected five weeks later and rejected on joint finish, rebuilt with a bucket handle joint and approved three weeks after that. Fifteen weeks from order to discharge. Timings are illustrative.

When the panel is rejected

Ask for the reason in writing, expressed as a single variable. Officers usually know exactly what is wrong, and the useful question is which of the nine variables in the table above needs to change.

Then build variants side by side rather than sequentially. Three bays, each with one variable changed, inspected in a single visit, is far faster than three rounds of one panel. Label them and photograph them.

Where the disagreement is about principle rather than appearance, for example a request for lime putty rather than a natural hydraulic lime, ask for the technical reason and respond with one. A specification backed by the masonry's actual condition and exposure carries more weight than a supplier's preference, and a Heritage Statement that already set out the fabric's characteristics gives you something to point at.

Wording to agree before the decision issues

This is where the time is actually saved. Before the decision notice issues, propose wording that does five things: ties the panel to the specific elevation or phase rather than to the whole development, states the panel size and location, requires the authority to respond within a stated period, allows the panel to be removed once the relevant masonry is complete, and lists the variables to be approved so the scope is closed.

Where the condition would be pre-commencement on a planning permission, your written agreement is required, so use that moment to negotiate rather than to consent. Offer the panel as a pre-superstructure condition instead of a pre-commencement one, which lets groundworks proceed while the brick is being sourced.

And ask who will discharge it. Where a conservation officer is shared between authorities or works part time, the response period in the condition is the difference between a three week wait and a three month one. Our note on reinstating lost features and the evidence a council expects covers the related documentary standard for replacement work.

Order the brick and the sand before you apply to discharge. Enter your postcode on PlanScope to see which heritage documents your scheme needs, and have any draft reviewed before submission. A Historic Building Recording exercise often supplies the fabric evidence a panel specification needs.

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, so check the position with your local planning authority or a qualified professional before relying on it.