How to Water a Greenhouse Legally in a Hosepipe Ban
A hosepipe ban does not stop you watering your greenhouse. It bans mains water through a hosepipe, not a watering can or water from a butt. Cans filled from the tap stay legal. So does any water from a butt, rainwater or grey water. Some bans also allow timed drip systems with a pressure-reducing valve. Breaking a ban risks a £1,000 fine. We have fitted butt and drip kits to several hundred greenhouses.
Key takeaways
- A hosepipe ban only bans mains water through a hosepipe. Watering cans and buckets filled at the tap stay legal for your greenhouse.
- Water from a butt, rainwater or grey water is never covered by the ban. The rules apply to mains supply, not stored rain.
- Some bans exempt automatic drip or trickle systems fitted with a pressure-reducing valve and a timer. Wording varies, so check your water company.
- Breaking a ban can cost up to £1,000 on prosecution. Blue Badge holders and some new plantings are usually exempt.
- Fit a water butt now. An 8x6 greenhouse roof catches roughly 3,800 litres of free, legal water a year.
Installer's Note
Every July the phone rings with the same worry. Last summer a customer in Kent, under the South East Water ban, thought her tomatoes were doomed. They were not. Greenhouse plants are watered by hand or from a butt anyway, so a ban barely touches you. In 16 years of fitting greenhouses, the growers who fit a butt on day one never think about bans again.
Do hosepipe bans apply to greenhouses?
A hosepipe ban applies to your garden, greenhouse included, but only to mains water used through a hosepipe. The legal name is a Temporary Use Ban. It sits under the Water Industry Act 1991. Your water company declares one when reservoir levels drop.
In 2026 bans reached millions of homes. Anglian Water, South East Water and Southern Water all restricted supply across eastern and southern England. More may follow through a dry summer. The good news for greenhouse owners is simple. The way you already water is almost certainly still allowed.
The ban targets the hosepipe on the mains tap. It does not target the water itself. Fill a can at the kitchen sink and carry it out, and you are within the rules. That covers most greenhouse watering already.
What a hosepipe ban actually bans (and what it does not)
The ban stops mains water through a hosepipe for watering plants, cleaning cars and filling pools. It does not stop hand watering or the use of stored water. The exemptions matter more than the ban for anyone growing under glass.
These methods stay legal in almost every ban:
- A watering can or bucket filled from any tap. This is the core exemption and it never changes.
- Any water from a butt, rainwater, or grey water from the kitchen and bath. The ban covers mains supply only.
- Drip or trickle irrigation fitted with a pressure-reducing valve and a timer, in many companies' rules. This is the one to check.
- Blue Badge holders and registered disabled customers, plus newly planted areas for a short window in some areas.
The wording differs between suppliers, so read your own company's list. For the background on efficient watering under glass, our guide to manual and automatic watering systems walks through every option.
Matt's Tip: Check the exact wording first
Do not guess from a headline. Every water company publishes its Temporary Use Ban exemptions on one web page. Read the drip-irrigation clause in full. Some allow a timed system with a pressure-reducing valve; a few do not. Two minutes of reading saves a £1,000 gamble.
Legal ways to water your greenhouse in a ban, compared
Every method below keeps you inside the rules, ranked by how little effort each one takes. A can works but eats your evenings in a heatwave. A butt-fed automatic kit does the job while you sleep.
| Method | Legal in a ban? | Effort | Best for | Matt's verdict |
|---|---|---|---|---|
| Watering can from the tap | Yes, always | High | A few pots | Fine for a 6x4, hard work in July |
| Can filled from a water butt | Yes | High | Any greenhouse | Free water, same effort |
| Hose or pump from a butt (not mains) | Yes, in most bans | Medium | Bigger greenhouses | Check the wording, then enjoy it |
| Butt-fed AutoPot or drip kit (Matt's Pick) | Yes, gravity or timed | Very low | Tomatoes, growbags, holidays | The set-and-forget answer |
| Mains drip with valve and timer | Often exempt, check | Low | Whole greenhouse | Legal in many bans, verify first |
| Mains water through a hosepipe | No | Low | Nothing during a ban | This is the banned one |
The pattern is clear. Move your water source off the mains and onto a butt, and the ban stops mattering. Add a gravity-fed kit and the watering happens on its own.
Matt's Pick for legal, hands-free watering
Best For: Tomatoes and growbags that need steady water through a ban or a fortnight away.
Why I Recommend It: It gravity-feeds from a butt or tank, so it never touches the mains. I set one up before every family holiday and the plants outgrow the hand-watered ones.
Price: £59
Fit a water butt to your greenhouse: the legal free source
A water butt turns your greenhouse roof into a legal supply the ban cannot touch. Rain falls free and stays yours. A downpipe kit clips the gutter to the butt in under an hour. From then on you water from stored rain, ban or no ban.
An 8x6 greenhouse roof catches roughly 3,800 litres of rain a year in the UK. That is thousands of watering cans without a drop of mains water. The maths, sizing and fitting steps are all in our guide to rainwater harvesting with butts and diverters.
Shop the Vitavia Water Butt Connecting Kit →
For a Vitavia frame, the connecting kit from £24 snaps onto the downpipe without cutting. Elite and most aluminium frames take a matching gutter kit sized by width. Stand the butt on slabs so a can fits under the tap.
Matt's Installation Tip
Set the diverter at the top of the butt, never higher. Too high and the butt never fills to the brim. Too low and it overflows from the diverter instead of the proper outlet. Stand the butt on its slabs first, then measure from the lid and cut the downpipe. Raising the butt later throws the height out.
Butt-fed drip and AutoPot kits: watering while you sleep
An automatic kit fed from a butt waters your greenhouse legally and without a hosepipe. Gravity-fed AutoPot trays open a valve when the pot dries out. A timed drip kit releases a set dose each morning. Both draw from stored water, so no ban applies.
This is the answer for tomatoes, cucumbers and growbags that hate drying out. In a July heatwave a growbag can dry in a day, and irregular watering brings on blossom end rot. A steady drip prevents it. Pair it with the right growbag setup and the crop looks after itself.
Shop the Palram Canopia Drip Irrigation Kit →
A drip kit from £45 runs off a raised butt or a small pump. If your ban exempts timed systems with a pressure-reducing valve, you can even run one from the mains legally. Check that clause before you plumb it in.
Grey water, warm water and holiday cover
Grey water from the kitchen or bath is legal to use and free. Cooled cooking water, washing-up water without harsh bleach, and bathwater all suit established greenhouse plants. Keep it off seedlings and salad leaves you eat raw.
Let stored water warm before it touches roots. Rainwater from a shaded butt can be 6 to 8C colder than the greenhouse air on a summer morning. Cold water shocks tender roots. I keep a full can standing inside the greenhouse so it reaches air temperature first.
Going away during a ban? A gravity kit fed from a full butt covers a fortnight easily. Add shading and airflow so the greenhouse does not cook while you are gone. Our guide to keeping a greenhouse cool in summer keeps demand down in the first place. The team at Greenhouse Stores can match a butt and kit to your exact frame.
Ready to set yours up? Browse the full range of rainwater downpipe kits and pick the size for your greenhouse, or read our rundown of the accessories you actually need.
Legal ways to water your greenhouse in a ban
"A hosepipe ban is a nuisance for lawns, not for greenhouses. Every grower we fit a water butt for stops worrying about restrictions for good. A £24 connecting kit and a gravity-fed tray means legal water, steady tomatoes and a fortnight away with no dead plants. It is the cheapest peace of mind in the whole garden."
— Matt W, Greenhouse Stores
Frequently asked questions
Can I water my greenhouse during a hosepipe ban? Yes. A hosepipe ban only stops mains water through a hosepipe. Watering cans, buckets and water from a butt all stay legal for your greenhouse.
Can I use a water butt during a hosepipe ban? Yes, freely. The ban covers mains supply only, so rainwater from a butt is never restricted, even through a hose or pump.
Is drip irrigation allowed in a hosepipe ban? Often, but check your supplier. Many bans exempt automatic drip or trickle systems fitted with a pressure-reducing valve and a timer.
What is the fine for breaking a hosepipe ban? Up to £1,000 on prosecution. Water companies rarely prosecute first offences, but the legal maximum is a criminal fine.
Can I use grey water on my greenhouse in a ban? Yes. Bath and washing-up water are legal and free. Keep harsh bleach off it and avoid using it on salad leaves eaten raw.
Does a hosepipe ban apply to a greenhouse or just the garden? It applies to both, but only to mains water through a hosepipe. Hand watering and stored water are allowed everywhere.
