A food inspection and grading system turns an inspector's findings into a published grade through a fixed method, risk-based visit frequency and a right of appeal. The UK's Food Hygiene Rating Scheme rates businesses from 0 to 5 on three elements, and New York City grades an inspection score of 0 to 13 points as an A.
This guide is for food safety authorities and municipalities that design or reform grading schemes, inspection managers and trainers, and food businesses that want to inspect themselves the way a regulator would.
What makes a food grading scheme consistent?
A grade is only fair if two inspectors visiting the same kitchen on the same day would give the same result. That depends on decisions written down before the first visit, not on the experience of individual officers. The schemes compared below share the same building blocks.
- Inspector competence: qualification, training, and regular checks that officers score alike.
- A defined on-site method, so every visit covers the same ground in the same order.
- Risk-based frequency, so high-risk premises are seen more often.
- A classification of findings by public health risk.
- A scoring model that converts findings into a number, and grade bands that convert the number into a grade.
- Rules for displaying and publishing the grade.
- Enforcement routes for serious findings, and a route to appeal or request a re-visit.
The scoring model is where schemes differ most. Some add penalty points per violation. Others rate a few broad elements and combine them.
How do established schemes score and grade food businesses?
The UK's Food Hygiene Rating Scheme is run by the Food Standards Agency with local authorities in England, Wales and Northern Ireland. A food safety officer checks three elements: how hygienically food is handled, the physical condition of the premises, and how the business manages food safety. The last element gives the officer's confidence that standards will be maintained. To reach 5, a business must do well in all three.
New York City uses penalty points. Its letter grading page says restaurants have posted grades since 2010. In the Health Department's scoring sheet, a public health hazard carries at least 7 points, a critical violation at least 5 and a general violation at least 2. Extra points reflect how extensive the problem is, on condition levels from 1 to 5.
In Abu Dhabi, ADAFSA announced its Zadna Rating in June 2023, as reported by the Emirates News Agency. Stickers with a QR code were to be placed on 6,900 restaurants, cafes, bakeries and caterers. Check ADAFSA for the current criteria before relying on the details in the table.
| Scheme | Scale | What is assessed | Display |
|---|---|---|---|
| UK Food Hygiene Rating Scheme | 0 (urgent improvement required) to 5 (very good) | Food handling, physical condition of premises, management of food safety | Required by law in Wales and Northern Ireland. Voluntary in England |
| New York City letter grades | A: 0 to 13 points. B: 14 to 27. C: 28 or more | Violations of City and State food safety rules, weighted by health risk and extent | Grade card posted where passers-by can see it |
| Abu Dhabi Zadna Rating (announced 2023) | Excellent, very good, good, needs improvement | Design and structure, equipment and waste facilities, handler hygiene, food handling and temperature control, food safety management records | Sticker with QR code at the entrance, plus an app |
The Abu Dhabi rating also carries a separate assessment of participation in the Abu Dhabi Public Health Centre's Sehhi programme.
How should an inspector run the visit?
The method matters as much as the scoring model. The steps below are AGS's practical reading of good inspection practice. They are not taken from any one scheme.
- Prepare: read the last report, open enforcement actions, complaints and the business's food safety plan.
- Move from clean to dirty: start at finished and ready-to-eat product and work back to raw materials and waste, so the inspector does not carry contamination.
- Gather evidence the same way every time: calibrated probe readings, photographs, record checks and short interviews with food handlers.
- Classify each finding against the scheme's list before scoring it, not after.
- Act at once on imminent risk. The UK scheme expects officers to stop part or all of a business where food may be unsafe.
- Close the visit with the person in charge, explaining each finding and what would raise the grade.
Meat and abattoir inspection adds checks that cannot be repeated later, such as ante-mortem examination. Our guide to meat inspection covers that work.
How often should each business be inspected?
Frequency follows risk. Under the UK scheme, local authorities consider the type of food handled, the number and type of customers including vulnerable groups, the processes carried out and the hygiene standards found at the last inspection. Intervals run from six months for the highest-risk businesses to two years for lower-risk ones, and can be longer for some very low-risk premises.
New York City builds frequency into its grading cycle. A restaurant that does not earn an A at its initial inspection is scored but not graded, and is re-inspected unannounced, typically within a month. Poor performers can be inspected roughly monthly until they improve or are closed.
For a restaurant chain, an internal programme that mirrors the regulator's frequency and method is the cheapest way to avoid surprises. Our guide to HACCP for restaurant chains covers the food safety system behind it.
How do appeals and re-rating work?
The UK scheme has three safeguards for businesses. A business can appeal in writing within 21 days of being told its rating, including weekends and public holidays. The appeal is reviewed by the lead food officer or a deputy, never by the officer who gave the rating, and the result is due within 21 days.
A business also has a right to reply, which the local authority publishes online alongside the rating, and it can ask for a re-rating inspection once it has made the improvements. In England, where the visit is free, it will not usually happen in the first three months after the inspection. These rules are set out in the FHRS guidance for businesses, updated on 30 June 2026.
In New York City, a restaurant graded B or C receives a grade card and a "grade pending" card. It can post either until its case is heard at the Office of Administrative Trials and Hearings Health Tribunal.
Where do ISO/IEC 17020 and ISO 9001 fit?
ISO/IEC 17020 sets requirements for bodies that perform inspection, including private inspection bodies and government inspectorates that seek accreditation. The current edition, ISO/IEC 17020:2026, was published on 27 March 2026. It replaced the old Types A, B and C with Type A and Type non-A. Our ISO/IEC 17020:2026 guide explains the changes and the transition to 27 March 2029.
A quality management system can support an inspectorate too. ISO 9001:2015 has been withdrawn, and ISO 9001:2026 was published on 16 September 2026. Ask your certification body how it is handling the transition.
How AGS can help
Two AGS products cover food inspection practice, as editable Microsoft Word files.
- Inspection, Audit & Grading Guidelines (Compliance & Assurance Series): 1 document, a single guideline on inspection, audit and grading practice.
- International Technical Guidelines Pack - Food Inspection Practice: 4 documents, inspection guides for food service, food manufacturing, meat inspection and food commodities.
Frequently asked questions
Does a 5 rating or an A grade mean a business is certified?
No. A hygiene rating or grade is a regulator's snapshot of standards found on the day. Certification to a food safety standard is issued by a certification body after its own audit.
Which businesses get no rating under the UK scheme?
Low-risk businesses such as newsagents selling pre-wrapped goods that need no refrigeration, and childminders and caring services at home. They are inspected but not rated.
Are New York City initial inspections always graded?
Only when the restaurant scores 13 points or fewer and earns an A. Otherwise the re-inspection is graded.
Can a private company run a municipal grading scheme?
That depends on the food law of each country or city. Check who the law allows to inspect and grade before you design the scheme.
AGS provides independent documentation toolkits. This guide and the referenced documents are not affiliated with, endorsed by or approved by the Food Standards Agency, the New York City Department of Health and Mental Hygiene or ADAFSA. The same applies to ISO and to any accreditation or certification body. They do not guarantee any inspection, grading or accreditation outcome.
Reviewed October 2026. Facts checked against the sources current at publication.
