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By the Blue Harbour Estates winter maintenance team, commercial grounds and winter services across Kent, London and the South East. Last reviewed 29 September 2026. The short answer A winter maintenance contract is a written agreement in which a contractor commits to monitor the weather and grit, de-ice and clear snow from agreed areas of …
By the Blue Harbour Estates winter maintenance team, commercial grounds and winter services across Kent, London and the South East. Last reviewed 29 September 2026.
A winter maintenance contract is a written agreement in which a contractor commits to monitor the weather and grit, de-ice and clear snow from agreed areas of your site whenever set conditions are met, usually from October or November to March or April. A good one does five jobs: it maps exactly which areas get treated, sets a clear trigger (typically a forecast road surface temperature of around 1°C or below with moisture present), fixes response times, specifies salt and spread rates, and guarantees a dated log of every visit that you can pull out if a slip claim lands months later.
If your current contract only says “gritting as required”, you do not really have a contract. You have a phone number. The 12-point checklist below shows what to put in writing before the first frost.
A winter maintenance contract (sometimes called a gritting contract or winter service agreement) covers the planned treatment of private land during cold weather. That means car parks, service yards, loading bays, footpaths, ramps, entrances and private estate roads. It usually includes:
We covered the basics of costs, pricing models and who is legally responsible in our guide to commercial gritting in Kent. This article goes one step further. It is about the paperwork: what the contract itself should say, so you get the service you are paying for.
Because the contract is your evidence. Under the Occupiers’ Liability Act 1957 you owe visitors a duty to take reasonable care for their safety, and under Regulation 12 of the Workplace (Health, Safety and Welfare) Regulations 1992 employers must keep traffic routes free from slippery surfaces so far as is reasonably practicable. The HSE’s Approved Code of Practice says arrangements should be made to minimise risks from snow and ice, which may involve gritting, snow clearing and closing some routes.
If someone slips on your car park in January, their solicitor has up to three years to bring a personal injury claim under the Limitation Act 1980. Your defence will rest on three questions:
A vague contract fails the first question. Missing logs fail the third. The checklist below is built to answer all three.
Every contract should include a site plan showing each area to be treated, colour-coded by priority. Priority 1 is usually main entrances, disabled bays, ramps, steps and pedestrian routes. Priority 2 covers main car park aisles and delivery routes. Priority 3 is overflow parking and low-use areas. Without a plan, “the car park” can mean anything, and disputes start on the first icy morning.
This is the single most important clause. Industry practice is to act when the forecast road surface temperature is at or below about 1°C and moisture is present or expected. Ground surfaces freeze before the air does, so an air temperature trigger alone is not good enough. The contract should name the forecast source and say whether it is site-specific or regional.
Kent has real microclimates. A site on the North Downs near Detling or Wrotham can freeze hours before a coastal site in Thanet or Folkestone. A regional forecast can miss that entirely.
Ask for times in writing. For example: “precautionary treatment completed by 06:00 on trigger nights” or “Priority 1 areas treated within two hours of a reactive call-out”. If you run shifts, a care home or a 24-hour distribution site, make sure the windows match your busiest foot traffic, not the contractor’s route.
The contract should state what is being spread. Brown rock salt to BS 3247 is the standard for most sites. White marine salt is cleaner for entrances and pedestrian areas where brown salt gets walked indoors. For reference, the National Winter Service Research Group (NWSRG) highways guidance sets a minimum precautionary spread rate of 8 g/m² for dry salt, with heavier rates as temperatures fall and conditions worsen. Your contractor should explain the rates they use and why.
Gritting and snow clearance are different jobs. Spell out when ploughing starts (for example, at 30 mm or 50 mm of settled snow), where cleared snow is piled (never over drains, fire exits or disabled bays) and whether snow clearance is included or charged extra.
Whether you choose pay per visit, a fixed seasonal price or a hybrid retainer, the contract should say exactly what counts as a chargeable “visit” and what happens in an extreme winter. Look for caps, rates for extra call-outs and how snow events are billed. Our commercial grounds maintenance cost guide shows how winter cover fits into a wider annual budget.
Most contracts run from 1 November to 31 March, but early frosts in October and late ones in April do happen in Kent. Check whether the contractor will attend outside the window, and at what rate.
This is the real deliverable. Every visit should log the date, time, areas treated, salt used, surface and weather conditions, and the operator. Ideally it is backed by GPS vehicle tracking or time-stamped photos. Crucially, the contract should say how long records are kept (at least three years, to match the claims window) and how quickly you can get a copy.
Who supplies the bins, how many, where do they go and how often are they refilled? Grit bins let your own staff treat a doorway at 7am on a marginal morning without waiting for a lorry.
Ask for a current certificate of public liability insurance (commercial sites commonly require £5 million or £10 million cover) and relevant health and safety accreditations such as SafeContractor or other SSIP schemes. Keep copies on file.
The contract should name a 24/7 contact, say how you will be told a treatment has happened (email, portal or text) and set out what happens if the contractor cannot attend, such as during a regional snow event.
Good contracts are two-way. You may need to provide overnight access, move parked vehicles from treated areas or report local problems like a leaking gutter that refreezes every night. Put these in writing so nothing falls between the gaps.
| Clause | Weak wording | Strong wording |
|---|---|---|
| Scope | “Grit car park as required” | “Treat Priority 1 and 2 areas as marked on Appendix A site plan” |
| Trigger | “When cold” | “When site-specific forecast road surface temperature is 1°C or below with moisture present” |
| Timing | “Early morning” | “Precautionary treatment complete by 06:00” |
| Salt | “Grit” | “Brown rock salt to BS 3247, white salt on entrances, stated spread rates” |
| Snow | “Snow clearance available” | “Ploughing from 30 mm settled snow, included in seasonal price” |
| Records | “Records kept” | “Time-stamped visit logs, retained for 3 years, supplied within 48 hours on request” |
| Contact | “Office number” | “Named 24/7 duty manager and escalation route” |
Now. Late September and October is the last comfortable window to agree a contract, run a site survey and get your site plan signed off before the service period starts. Contractors plan routes and crews ahead of the season, so sites that sign in November often join at the back of the queue on the first hard frost.
Do not be lulled by talk of a mild winter either. Mild, damp winters produce plenty of marginal nights where surfaces hover around freezing with moisture present. Those are exactly the nights that catch sites out, and exactly when a clear trigger clause earns its keep.
A team that maintains your grounds all year already knows the corner that always freezes first, the ramp by the loading bay and the drain that floods in heavy rain. At Blue Harbour Estates we deliver winter gritting and snow clearance alongside our year-round commercial grounds maintenance in Kent, from business parks in Maidstone and Ashford to schools, retail sites and residential estates in Medway, Canterbury, Sevenoaks and Tunbridge Wells. One contract, one point of contact, one set of records.
At minimum: a marked-up site plan, a measurable weather trigger, treatment times, salt type and spread rates, snow clearance thresholds, a clear pricing model, the service period, visit records you can retrieve, grit bin provision, insurance details, a 24/7 contact and both parties’ responsibilities.
Most professional contracts trigger precautionary gritting when the forecast road surface temperature is at or below around 1°C with moisture present. Surface temperature matters more than air temperature, because ground surfaces can freeze while the air is still above zero.
Keep them for at least three years. That matches the standard limitation period for personal injury claims under the Limitation Act 1980, and slip claims often arrive months after the incident.
Most commercial contracts run from 1 November to 31 March, though many providers offer cover from October to April. Early autumn is the best time to sign so you are covered from the first frost.
Not always. Many contracts price snow clearance separately because it needs different equipment and more labour. Check the wording and agree a snow depth threshold in advance.
Yes. If someone is injured on untreated ice that was reasonably foreseeable, the occupier can face a claim under the Occupiers’ Liability Act 1957. A documented winter maintenance contract, followed and recorded, is one of the strongest ways to show you took reasonable care.
The time to fix a vague gritting contract is before November, not after the first slip. Blue Harbour Estates will survey your site, draw up a priority plan and give you a clear, fixed quote with the trigger, timings and records written in. Book your free winter site survey and get your Kent site covered from day one.
