You can build your own smoker for as little as around 50 euros with an old oil drum, or you can lay bricks for a smart stone smokehouse for around 250 euros.
You make the most important choice up front: do you want to cold smoke (below 25°C, for salmon, cheese and bacon) or hot smoke (60 to 90°C, where the food cooks straight away)?
With cold smoking the fire has to be separated from the smoking chamber. With hot smoking the fire simply sits underneath. Beyond that, one rule applies everywhere: use only hardwood such as beech, oak, alder or fruitwood, never softwood or treated wood.
Below I’ll walk you through all the build methods, the temperatures, the right wood and the smoking and curing times per product. Then you can get started today.
Cold smoking or hot smoking: what’s the difference?
This is the bit most people skip, and that’s exactly where it usually goes wrong.
There are broadly three ways to smoke. They differ in temperature, and that determines what kind of smoker you need.
| Method | Temperature | What happens | Examples |
|---|---|---|---|
| Cold smoking | 15 to 25°C | Food does NOT cook, only flavour and preservation | Salmon, cheese, bacon, smoked sausage, salt, nuts |
| Warm smoking | 30 to 60°C | Food slowly cooks along the way | Mackerel, trout, eel, chicken |
| Hot smoking | 60 to 110°C | Food cooks fully, like an oven with a smoky flavour | Spare ribs, chicken breast, pork belly, whole fish |
Why is that 25°C threshold so important?
From about 30°C the proteins in fish and meat start to set. Your salmon then goes half-cooked and loses that silky-soft texture.
And watch out: the zone between 25°C and 60°C is the danger zone. That’s where bacteria grow fastest. So for cold smoking you want to stay below it, and for hot smoking you want to move through it quickly.
For building, this means one thing. With cold smoking you have to keep the fire far enough from the food so the smoke has cooled before it reaches the smoking chamber. With warm and hot smoking the fire can simply sit underneath the food.
Which wood or sawdust do you use?
Wood is the flavour maker. The wrong wood ruins your whole batch, so this is no small detail.
Use hardwood only. Beech is the standard and suits almost everything. Oak gives a firmer, spicier smoke. Alder is the classic for fish. Fruitwood such as apple, cherry, pear and plum gives a mild, sweet smoke, brilliant for chicken and cheese.
Never softwood. Pine, spruce, fir and all resinous species contain resin. That gives a bitter, sooty flavour and deposits toxic substances onto your food.
Also never: treated, painted or glued wood, and no chipboard. When heated, these release chemical substances.
The size of the wood depends on your method.
| Type | Form | Used for |
|---|---|---|
| Smoking dust (fine sawdust) | Powdery | Cold smoking, smoulders slowly and cool |
| Smoking chips | Shavings | Warm and hot smoking |
| Smoking chunks | Fist-sized blocks | Long hot smoking, over hours |
For cold smoking you almost always work with smoking dust in a so-called cold smoke generator (a spiral-shaped tray that lets the dust smoulder without a flame). More on that further down.
Build your own smoker: 5 methods compared
There’s no single right way. It depends on your budget, on whether you’d rather work with metal or wood, and on whether you want to cold smoke or hot smoke. Here are the five most popular methods.
| Method | Cost (rough guide) | Difficulty | Cold smoking | Warm/hot smoking |
|---|---|---|---|---|
| Oil drum / smoking barrel | 50 to 100 euros | Medium | Yes, with a separate fire | Yes |
| Wooden smokehouse | 130 to 200 euros | Medium | Yes, excellent | Limited (fire risk) |
| Brick built | 200 to 350 euros | High | Yes | Yes |
| Old fridge | 20 to 60 euros | Low | Yes, excellent | No |
| Flowerpot smoker | 30 to 50 euros | Low | Limited | Yes |
I’ll go through them one by one.
Building a smoker from an oil drum (the classic)
The oil drum or smoking barrel is the most popular self-build, and for good reason. It’s robust, big enough for a decent batch and suitable for both warm and cold smoking.
What you need:
- A 200-litre steel oil drum (new or thoroughly cleaned)
- Angle grinder with a cutting disc
- Steel bars or skewers to hang the food from
- A steel (not aluminium) fire tray for the bottom
- A thermometer that reads up to 200°C
- Grates or hanging hooks
- A chimney pipe with an adjustable damper
Important first: clean the drum. If there’s still oil residue in a second-hand drum, you really have to burn it out. Build a good hardwood fire inside and let it burn for a long time until all residue is gone. You don’t want oil residue in your food.
The build, step by step:
- Cut the top off the drum. That becomes your lid.
- Make an air hole at the bottom and fit a sliding fire tray there. With that tray you regulate the air supply and therefore the temperature.
- Drill a hole at hanging height for the thermometer, so you measure where the food hangs, not where the fire is.
- Fit the steel bars at the top to hang your skewers from.
- Place a deflector plate (drip guard) above the fire tray so fat doesn’t drip into the fire and flare up.
- Fit the chimney pipe with a damper on top. That’s how you steer the draught and the smoke.
Be careful with aluminium: never use it for the fire tray or the deflector plate. Aluminium melts at high temperatures.
Want to cold smoke with this drum? Then you don’t put the fire in the drum, but next to it. You lead the smoke through a pipe to the drum so it cools along the way. More on that setup below under cold smoking.
Building a wooden smokehouse
Most of us are better at working with wood than metal, which is why a wooden smokehouse is a favourite project. Especially for cold smoking this is a winner, because wood insulates well and keeps the temperature low.
Size: a standard smokehouse is about 60 x 60 x 120 cm. Taller is fine, that gives better smoke distribution.
Material: untreated wood such as film-faced plywood (18 mm), okoumé or oak boards. Use stainless steel screws.
Crucial: don’t use any paint, glue or stain on the inside. If that heats up or catches fire, toxic fumes are released. Choose sheet material without glue if you also want to hot smoke.
Components:
- Support beams of 4 x 4 cm in the corners for strength
- Grates or skewers for the food
- A digital thermometer
- A chimney with an adjustable damper at the top
- A cast-iron dish or a separate cold smoke generator as the fire source
- Optional wheels (two fixed, two swivel casters with a brake) so you can move it
For cold smoking you place a cold smoke generator at the bottom. For warm smoking you keep the wood well away from the walls and work with an inner metal dish, otherwise the fire risk is too great.
Building a brick smoker from stone
Want something for the ages that also looks good in the garden? Then lay bricks for a smoker from fire-resistant stone. More expensive and more work, but indestructible and suitable for everything: cold, warm and hot.
What you need:
- Fire-resistant bricks (fire clay)
- Fire-resistant mortar or outdoor oven cement
- A concrete foundation
- A steel door for the smoking chamber
- Grates, hooks and a chimney
Approach in brief:
- Pour a flat, level foundation. This carries everything.
- Lay a separate firebox at the bottom.
- Build the smoking chamber above it, separated from the firebox by a smoke channel.
- By making that channel longer or shorter you regulate how warm the smoke arrives. A long channel means cooler smoke (good for cold smoking), a short channel means warmer smoke.
- Fit a chimney with a damper on top.
The beauty of stone: that mass keeps the temperature very stable. That makes long sessions a lot easier.
Smoker from an old fridge
This is the best-kept secret for cold smoking. An old fridge is already perfectly insulated, and it has grates and a tight-sealing door.
Watch out: first remove all the plastic inner lining, the cooling element and all the plastic. That must not get warm. What’s left is the metal skeleton and the metal grates.
Drill a hole at the bottom for the smoke inlet, drill a hole at the top as a chimney, and place a cold smoke generator next to or under it. Done. For cold smoking (cheese, salmon, bacon) this is one of the cheapest and best options there is.
For warm or hot smoking a fridge isn’t suitable, the insulation and any leftover plastic can then become a problem.
Flowerpot smoker (the cheapest hot smoker)
Want to hot smoke quickly and cheaply? Two large terracotta flowerpots on top of each other, an electric hotplate at the bottom with a small pan of smoking dust on it, a grate in between and the top pot as a lid with a thermometer in it.
This isn’t a cold-smoking solution, but for a spontaneous session of chicken breast or spare ribs at 90 to 110°C it works surprisingly well. Cost: a few euros.
How do you separate fire and smoking chamber for cold smoking?
This is the most important technical point in this whole article, and it’s exactly what most articles leave out.
With cold smoking the smoke must never arrive warm at the food. So you need distance between the fire and the chamber. There are three ways.
1. Cold smoke generator (easiest)
This is a metal tray in a spiral or zigzag shape that you fill with smoking dust. You light one corner with a tealight or torch. The dust then smoulders slowly for hours, without a flame and without heat.
You simply place this tray at the bottom of your smokehouse or drum. Because there’s no flame, the temperature stays low. For most hobbyists this is the simplest route to cold smoking.
2. Buried smoke pipe (the traditional way)
You make the fire in a separate pit or barrel, a few metres from the smoking chamber. Between them runs a pipe (a stove pipe, for example), sometimes buried in the ground. The smoke cools along the way through the pipe before it reaches the chamber.
Simple, reliable and free smoke cooling. Ideal in autumn and winter when it’s already cold outside anyway.
3. Two stacked drums
The bottom drum is the firebox, the top drum the smoking chamber, connected by a pipe. The distance cools the smoke.
Tip: cold smoking is best done in autumn and winter. In summer you often can’t get the temperature below 25°C, no matter how clever your construction is.
Food safety with cold smoking: what you need to know
Let’s be serious for a moment, because cold-smoked food isn’t cooked. The heat kills no bacteria, so you have to handle that another way. Don’t skip this.
The biggest risks are listeria, salmonella and (with meat) botulism. You tackle those with three things.
1. Curing with the right salt. Curing draws moisture out of the food and inhibits bacterial growth. For meat that’s stored or dried for a long time, you use curing salt (with nitrite), not plain salt. Nitrite protects against botulism. For salmon you’ll eat within a few days, plain (coarse) salt often suffices.
2. Keeping the temperature below 25°C. Above that threshold bacteria grow fast and the food half-cooks. So always measure.
3. Store cool and quickly. You keep cold-smoked products at a maximum of 4°C in the fridge. Vacuum-packed it lasts longer, from a few days to weeks. When in doubt: eat it or throw it out.
Cheese is the safest first time. There’s no raw meat involved, so little can go wrong. Start with that if you’ve never cold smoked before.
Curing and drying: the step before smoking
Many beginners just throw their fish or meat straight into the smoker. That’s a shame, because then you miss two steps that make the difference between amateur and pro.
A good smoking process has three phases: curing, drying, smoking.
Phase 1: Curing (4 to 24 hours)
You lay the food in a salt mix or a brine bath. This draws out moisture, adds flavour and inhibits bacteria. Salmon, for example, often sits overnight in a mix of salt and sugar. Afterwards you rinse it and pat it dry.
Phase 2: Drying and forming the pellicle (2 to 24 hours)
Now you lay it uncovered in the fridge or in cool outdoor air. A thin, sticky layer forms on the outside: the pellicle.
That pellicle is important. The smoke sticks to it much better, which means the flavour penetrates more evenly and deeply. Smoking without a pellicle gives a patchy, surface-only result.
Phase 3: Smoking
Only now does the smoker come in. Cold smoking takes a long time, reckon on 8 to 24 hours depending on the product and the intensity you want. Warm and hot smoking is faster.
After smoking: pack the food (vacuum or ziplock) and let it rest in the fridge. For salmon 24 hours is enough. For cheese you let the smoky flavour settle for at least a week, otherwise it tastes sharp and ashtray-like.
What can you smoke? Temperatures and times per product
Here’s the table you’re really doing this for. These are guide values, adjust them to thickness and taste.
| Product | Method | Temperature | Smoking time | Notes |
|---|---|---|---|---|
| Salmon | Cold | 15 to 22°C | 8 to 16 hours | Cure and form pellicle first |
| Cheese | Cold | 15 to 25°C | 2 to 4 hours | Rest for a week, ideal for beginners |
| Bacon / pork belly | Cold | 15 to 22°C | 8 to 24 hours | Use curing salt (with nitrite) |
| Smoked sausage | Cold | 18 to 25°C | 6 to 12 hours | Dry beforehand |
| Mackerel | Warm | 60 to 80°C | 1 to 2 hours | Core temperature 62°C |
| Trout | Warm | 60 to 80°C | 1 to 1.5 hours | Cure lightly |
| Eel | Warm | 60 to 90°C | 1.5 to 2 hours | Dry at 40°C first |
| Chicken (whole) | Hot | 90 to 110°C | 2 to 3 hours | Core 75°C |
| Spare ribs | Hot | 100 to 110°C | 4 to 6 hours | Smoky flavour plus cooking time |
The core temperature is your safety net with warm and hot smoking. Chicken is safe at 75°C in the core, oily fish at around 62°C. Use a meat thermometer, then you never have to guess whether it’s done.
Maintenance and fire safety
A smoker asks for little, but a few things it does.
After each session empty the fire tray and remove the ash. Wet ash eats into metal.
Remove caked-on fat regularly. Fat that builds up can catch fire and gives a rancid flavour.
Always place your smoker on a non-combustible surface (tiles, stone, sand), never right up against a fence, a wooden shed or overhanging branches. Keep at least a metre clear.
Working with a wooden smokehouse and warm smoking? Then always put the fire in a metal dish, never loose against the wall. Keep a bucket of water or a fire blanket to hand.
Store your smoker dry or cover it. Steel drums especially rust through from the inside otherwise.
Frequently asked questions
What’s the difference between cold and warm smoking?
With cold smoking (below 25°C) the food doesn’t cook, it’s only flavoured and preserved, think of salmon, cheese and bacon. With warm smoking (30 to 60°C) and hot smoking (60 to 110°C) the food does cook along the way, like mackerel, chicken and spare ribs. The big build difference: with cold smoking the fire has to be separated from the smoking chamber.
Which wood should I not use in my smoker?
Never use softwood (pine, spruce, fir) or other resinous wood, that gives a bitter flavour and deposits toxic substances. Also forbidden: painted, glued or treated wood and chipboard. Use only hardwood such as beech, oak, alder or fruitwood.
How much does it cost to build your own smoker?
From an old fridge you can make one for as little as 20 to 60 euros. An oil drum costs 50 to 100 euros, a wooden smokehouse 130 to 200 euros and a brick stone smoker 200 to 350 euros. Reusing materials brings the price down considerably.
Can I cold smoke in summer?
Tricky. Cold smoking has to stay below 25°C, and that often doesn’t work in summer, no matter how clever your setup is. Autumn and winter are the ideal seasons for cold smoking. A cold smoke generator helps, because it gives off no heat.
What is a pellicle and why is it important?
The pellicle is a thin, sticky layer that forms on your food when you let it dry uncovered for a few hours after curing. The smoke sticks to it much better, so the flavour penetrates more deeply and evenly. Skip this and your result turns out patchy.
Is home-smoked food safe?
Yes, if you follow the basics: cure with the right salt (curing salt with nitrite for meat that’s stored a long time), keep the temperature below 25°C when cold smoking, use a meat thermometer for warm and hot smoking, and store the food cool at a maximum of 4°C. To be safe, start with cheese, that’s where the least can go wrong.
Before you grab the angle grinder or lay your first brick: make sure your measurements and construction are right, because a skewed smoking chamber or a badly placed smoke channel will cost you your whole batch.
At fredsdiyplans.com you’ll find fully worked-out build plans with exact measurements, material lists and step-by-step drawings. That way you build a smoker in one go that holds the temperature nicely and lasts for years. Saves you a lot of trial and error in the garden.