Noise condition discharge that answers the exact wording on your decision notice.

A condition naming BS 4142 is about an industrial or commercial source affecting homes: plant, extract, deliveries, a service yard. The discharge needs the background sound level at the nearest homes, the specific sound level of the source as installed or as specified, and a rating level set against that background with the context assessed. Our BS 4142 explainer sets out how the rating level is built. A condition naming BS 8233, with or without ProPG, is usually about the people who will live in the new homes: facade levels, internal levels room by room against the guideline values, external amenity, and the glazing and ventilation specification that follows. Our BS 8233 and ProPG pages explain the documents themselves.

A condition on construction noise points at BS 5228-1: a construction noise assessment, a noise management plan or the noise section of a construction environmental management plan, usually to be approved before works start. Our construction noise page covers that work in full. A condition on a mixed-use scheme may name BS 4142 and BS 8233 together. The submission then has to show how the two interact rather than leave the officer to reconcile them. Where the wording names no standard and asks instead for an assessment to a recognised or appropriate method, the choice is ours to make and to justify, and the justification goes in the report, because an officer who is not told why a method was chosen will ask.

The criteria are the council's, not the textbook's: some authorities set the plant's rating level a fixed margin below background, and some set internal levels tighter than BS 8233's guideline values. Our noise impact assessments page sets out how local policy shapes an assessment; for a discharge, we check the local plan and any supplementary guidance for the authority before a meter leaves the office, and if that changes the scope, the quote changes before you instruct, not after.

A planning condition noise assessment is scoped by the wording, and different conditions need very different amounts of fieldwork. A pre-commencement condition asking for a baseline survey and an assessment needs the full exercise: unattended logging at the position that represents the affected homes or the proposed facades, long enough to capture the periods the condition is concerned with, which for night-time plant or a bedroom facade means at least one full night and often more. A verification condition on installed plant may need an attended measurement with the plant running and switched off, on one visit. A scheme-of-mitigation condition on a facade may need no new measurement at all if the application's survey still represents the site, in which case the work is desk-based and priced as such.

Measurements are made to BS 7445 with Class 1 sound level meters holding current traceable laboratory calibration certificates, field-checked against an acoustic calibrator before and after each deployment, with the weather recorded so the conditions of every measurement are on the record. The engineer who reads the condition runs the survey, writes the report and answers the officer's questions. Quotes come back within 10 minutes on average, a survey can usually start the next working day, and the report lands within five working days of the survey. Where the condition has to be discharged by a date, tell us the date and we will say whether it can be met before you instruct.

If the application-stage survey, ours or another consultant's, is recent, well documented and still represents the site, we will reuse it rather than measure again. A survey from several years ago, or one taken before a nearby road or business changed, is unlikely to survive an officer's scrutiny and should not be relied on. We say which it is when we quote, with the reason.

To discharge a noise condition in England or Wales you apply to the council, normally through the Planning Portal, for approval of the details reserved by that condition, and pay the council's fee; in Scotland and Northern Ireland the route differs, and we confirm it for the authority concerned. You or your agent can lodge it, or we can prepare the application pack for you to submit. What goes in is a report written to the condition: the condition and its reason quoted in full at the front, each limb answered in the order the condition sets it, the survey or the existing data it relies on identified, and a conclusion that says, limb by limb, whether the condition is met and what that depends on. Where mitigation is part of the answer it is specified so that the officer handling any verification condition can check it against what was built.

Several conditions can be discharged on one application, and a condition can be partly discharged where it has limbs that fall due at different times. Both are worth doing where the wording allows it. We also check the submission against the permission's approved plans, so that a plant position or a facade build-up in the report matches the drawings the council has already approved; a report that quietly assumes a different layout gives the officer a reason to refuse it without reading the acoustics. Our noise impact assessments page sets out what makes an officer accept a report in general. Here the point is narrower: the submission has to answer the condition, and nothing else.

A noise discharge is normally sent to the environmental health officer for comment, and the EHO's queries come back through the case officer. They are usually specific: the survey period, the choice of background value, a correction not applied, a policy margin not addressed. The engineer who wrote the report answers them in writing, with the data, and revises the report where the point is fair. Where the quote says the Approval Guarantee applies and you adopt the approach the report recommends, a written technical objection from the council to the methodology, calculations or conclusions is met by revising the report at no additional cost until it is resolved, and if revision cannot resolve it the fee for that work is refunded. It guarantees the work, not the decision.

In England the council has eight weeks to determine a discharge application unless a longer period is agreed with you in writing. Where the queries are reasonable and the extra time is being used, agreeing an extension is normally the sensible course. Where nothing is happening, the planning procedure rules in England allow you to serve a deemed discharge notice once six weeks have passed since the application was received. The notice names a date. It can be no earlier than the end of the determination period, and at least two weeks after the council receives the notice. If no decision has issued by that date, the condition is treated as discharged on the terms of what you submitted. Certain classes of condition are excluded, and a council served with one may issue a refusal rather than let the date pass. It is a lever, not a shortcut: it binds you to the details exactly as submitted, and a condition deemed discharged on a thin submission still leaves you building mitigation nobody has checked. The other route is an appeal against refusal or non-determination, which is slower and is best avoided by getting the first submission right.

The most expensive mistake is starting work with a pre-commencement condition undischarged. Works begun in breach of a condition of that kind may not be authorised by the permission at all: the council can take enforcement action against them, and if the permission's time limit runs out before the development has lawfully begun, the consent can lapse. If the start date is close and the condition is not yet discharged, tell us the date when you send the notice and we will programme the survey and report around it.

Fixed fees start from £1,250 + VAT. Most plant and residential noise conditions that need a survey and an assessment, before commencement or before occupation, land between £1,250 and £2,500 + VAT, survey and report together. A desk-based discharge, a scheme of mitigation worked up from an existing survey or a plant check from manufacturer data, can cost less than one that needs a survey. Schemes with several sources, or a BS 4142 and a BS 8233 condition to be answered in one report, cost more. The fee is priced to the condition's wording, agreed before anything starts, and does not move: no day rates, no extras, and the programme runs the same wherever the site is. The council's application fee is separate and is paid to the council.

To quote we need the decision notice, or at least the condition and its reason, the site postcode, the approved drawings you have and any correspondence with the officer so far. The quote comes back within 10 minutes on average and says, in plain terms, what the condition requires, what we propose to do about it and what that costs.