💡 Quick answer: You can store up to 5kg NEC of consumer fireworks at home indefinitely without a licence. Up to 50kg NEC of 1.4G (HT4) fireworks for up to 21 days. Up to 100kg NEC of 1.3G (HT3) fireworks for up to 5 days at the place you intend to use them. Any quantity for up to 24 hours. Above 50kg you need a storage licence to buy them in the first place. All limits refer to Net Explosive Content, not total firework weight.
If you're buying fireworks weeks before Bonfire Night, stocking up during the January sales, or planning a big display and buying in stages — you need to know how much you can legally keep at home. The rules are more generous than most people think, but they are specific, and getting them wrong technically makes you an unlicensed explosives store.
The good news: for the vast majority of home displays, you're well within the legal limits. The rules only start to matter when you're buying in bulk — typically for larger private events or community displays.
The regulations that govern this are the Explosives Regulations 2014 (specifically Regulation 7), and the limits are measured in NEC — Net Explosive Content. Understanding what NEC means is the first step.
What Is NEC (Net Explosive Content)?
NEC stands for Net Explosive Content. It's the weight of the actual explosive material inside a firework — not the total weight of the firework including the tube, wrapper, clay plugs and everything else.
A firework that weighs 2kg in total might contain only 200g of NEC. The cardboard tube, base, plugs and casing make up the rest. So when the law says "5kg NEC," that's a lot more fireworks than you might first assume.
➡️ Where to find the NEC
The NEC is printed on the transport packaging — the brown cardboard outer box that fireworks arrive in. It's not always marked on the individual retail boxes. If you're not sure about a product's NEC, ask your supplier. We can tell you the NEC of anything we sell.
For reference, a typical F2 garden cake might have between 100g and 500g of NEC. A smaller fountain might be 30—80g. A selection box could be 150—400g. So 5kg of NEC is roughly equivalent to 10—15 decent garden cakes, or a very respectable home display.
How Much Can You Store Without a Licence?
The Explosives Regulations 2014 (Regulation 7) set out clear exemptions for storing fireworks without a licence. These are based on the quantity of NEC, the hazard type of the fireworks, and how long you intend to store them.
Storage Exemptions at a Glance
| Limit | Firework Type | Time Limit | Conditions |
|---|---|---|---|
| Up to 5kg NEC | HT3 or HT4 (1.3G or 1.4G) | No time limit | No licence needed. Store indefinitely |
| Up to 50kg NEC | HT4 only (1.4G) | Up to 21 days | Not for sale, not for use at work |
| Up to 100kg NEC | HT3 fireworks (1.3G) | Up to 5 days | Must be at the place of intended use |
| Up to 250kg NEC | HT4 only (1.4G) | Up to 5 days | Must be at the place of intended use |
| Any quantity | HT3 or HT4 | Up to 24 hours | No limit on amount |
Critical rule: You can only use one of these exemptions at a time for a given site. You can't combine them — so you can't store 5kg indefinitely AND another 50kg for 21 days at the same address. You pick whichever exemption covers what you need.
What This Means in Practice
For a typical home display (Bonfire Night, New Year's Eve, birthday): You'll almost certainly be under 5kg NEC. A solid home display — say 6—8 cakes, a couple of fountains, some candles and a selection box — might total 2—3kg NEC. You can keep that in your shed or garage all year round, no licence needed, no time limit.
For a bigger private event (wedding, community bonfire, large party): If you're spending £300—£500 on fireworks, you could easily be in the 5—15kg NEC range. Under the 21-day exemption (HT4/1.4G) or the 5-day exemption (HT3/1.3G), this is perfectly legal — just don't hold onto them for longer than the time limit.
For a very large private display: Anything over 50kg NEC means you need a storage licence before you can even buy the fireworks (Regulation 9). This is rare for private consumers — 50kg NEC is a substantial amount of firework.
1.3G vs 1.4G: Why It Matters for Storage
The transport classification of your fireworks directly affects which storage exemption applies to you.
- 1.4G (Hazard Type 4): The less powerful classification. Most consumer fireworks. These get the most generous storage exemptions — up to 50kg for 21 days, or 250kg for 5 days at the use site
- 1.3G (Hazard Type 3): More powerful, larger fireworks. Still legal for consumers aged 18+, but storage exemptions are tighter — up to 100kg for 5 days at the use site only
Important: If you're storing a mix of 1.3G and 1.4G fireworks, the whole lot is treated under the 1.3G rules. So if you have 40kg of 1.4G cakes and add one 1.3G rocket, all 40kg+ falls under the 5-day, place-of-use exemption. Bear this in mind when building a display from mixed stock.
For a detailed guide on the differences between these classifications, see our 1.3G vs 1.4G fireworks guide.
NEC Limits Per Individual Firework
Each type of firework also has a maximum NEC per item, set by the Pyrotechnic Articles (Safety) Regulations 2015 and the BS EN 15947 standards. These limits determine the maximum power any single consumer firework can legally have:
| Firework Type | F2 (Garden) Max NEC | F3 (Display) Max NEC |
|---|---|---|
| Rocket | 75g | 200g |
| Fountain | 500g | 1,000g |
| Cake (single) | 500g | 1,000g |
| Compound cake (linked/fused) | 2,000g | 4,000g |
| Roman candle | 30g per tube | 80g per tube |
These limits help you estimate how quickly your NEC adds up. A big F3 compound cake could contain up to 4kg of NEC on its own — so just one or two of those would put you over the 5kg indefinite storage threshold.
When Do You Need a Storage Licence?
You need a storage licence if you want to store fireworks above the exemption limits. In practice, this applies to:
- More than 5kg NEC for longer than 21 days (1.4G) or 5 days (1.3G)
- More than 50kg NEC for any length of time (you need the licence to buy them in the first place — Regulation 9)
- Storage for commercial purposes (selling fireworks, or professional display use)
Storage licences are issued by your local authority (the fire service in most areas) for up to 2,000kg NEC. Above 2,000kg, you apply to the HSE directly.
For the average consumer? You'll never need one. Even a £500 display will typically be well under 50kg NEC.
Safe Storage at Home: Practical Tips
Legal limits aside, storing fireworks safely is common sense. These are explosives — treat them with respect.
✅ Safe Storage Checklist
- Keep them dry. Damp fireworks are unreliable and potentially more dangerous (they may partially ignite). Store in their original sealed packaging in a dry location — a garden shed, garage or spare room
- Keep them cool. Away from direct heat sources — boilers, radiators, direct sunlight. Normal room temperature or cool shed temperature is fine
- Keep them locked away. Out of reach of children. A locked cupboard, locked shed or locked room. Children and fireworks don't mix
- Keep them in their original packaging. Don't unpack fireworks from their transport boxes until you're ready to use them. The packaging is designed to contain them safely
- Keep them away from flammable materials. Don't store next to petrol cans, paint thinners, gas bottles or other combustibles
- Don't smoke near stored fireworks. Obvious, but worth saying
- Keep a record of what you've got. Know the NEC of your stored fireworks. Add it up. Stay within limits
Frequently Asked Questions
Can I buy fireworks months in advance?
Yes — as long as you stay within the 5kg NEC indefinite limit. Below that, there's no time restriction. If you want to buy more than 5kg and hold it for longer than 21 days (1.4G) or 5 days (1.3G), you'd need a storage licence.
Is 5kg NEC enough for a decent display?
Absolutely. 5kg NEC is more than most families will ever need. A generous home display — eight to ten cakes, a few fountains, some candles, a selection box — typically totals 2—3kg NEC. You'd need to be buying very heavily to hit 5kg.
What happens if I go over the limit?
Technically, you'd be storing explosives without a licence — an offence under the Explosives Regulations 2014.But the limits exist for good reason: fireworks are explosives, and proper storage matters.
Can I store 1.3G fireworks at home?
Yes. Up to 5kg NEC indefinitely, same as 1.4G. The difference is for larger quantities: 1.3G fireworks get a 5-day, 100kg limit at the place of use, while 1.4G gets a 21-day, 50kg limit (or 5-day, 250kg). Remember, mixing 1.3G and 1.4G means the whole lot follows 1.3G rules.
Do I need to tell anyone I'm storing fireworks?
Not if you're within the licence-free exemptions. There's no registration requirement for private individuals storing under the exempt limits. If you need a licence (above 5kg for longer than the time limits), your local authority handles the application.
What's the maximum I can buy at once?
A consumer can buy up to 50kg NEC without needing to show a storage licence (Regulation 9). If you want more than 50kg, the retailer must see your licence before selling to you.
The Bottom Line
For the vast majority of people buying fireworks for home displays, the storage limits are generous and straightforward. Under 5kg NEC — keep them as long as you like. Under 50kg NEC of 1.4G fireworks — up to 21 days. The rules are there to protect you and your neighbours, and they're based on decades of safety experience.
Everything we sell at Galactic Fireworks is consumer-legal and clearly labelled. If you ever need to know the NEC of a specific product, just ask — we carry that information for every item in our range and we can help you plan your display within the limits.
➡️ Questions about NEC or storage? Call us on 01709 769184 or email help@galacticfireworks.co.uk. We've been storing and selling fireworks since 1989 — safely and legally.
