Bagged compost isn't cheap. A single 50-litre bag from the garden centre can cost anywhere from £6 to £12, and if you've got beds, borders, pots and a veg patch to feed, that adds up fast over a season. The good news? The most inexpensive compost you'll ever use is the compost you make yourself - from waste you're already producing every single day.
In this guide, we'll walk through exactly how to make cheap, high-quality compost at home, what it actually costs (spoiler: very little), and how to speed the whole process up so you're not waiting a year for a usable result.
Why Homemade Compost Is the Cheapest Compost There Is
Every household already generates the two raw ingredients compost needs for free:
- "Greens" - food scraps, vegetable peelings, tea bags, coffee grounds, grass cuttings, fresh plant trimmings
- "Browns" - cardboard, shredded paper, dead leaves, twigs, straw
You're either throwing these away or paying your council for garden waste collection - so composting them yourself isn't really a cost, it's a saving. Add in the money you're no longer spending on shop-bought compost, mulch and soil improver, and a compost bin usually pays for itself within a year or two.
What You Actually Need to Get Started
You don't need fancy kit to start composting cheaply. At the most basic level, all you need is:
- Somewhere to put it – a heap, a wooden pallet bay, a plastic dalek-style bin, or a purpose-built composter
- A mix of greens and browns – roughly equal parts by volume
- Time and a bit of moisture – nature does the rest
The cheapest option is a simple open heap or a basic plastic bin, and there's nothing wrong with that if you're not in a rush and don't mind occasionally turning it. Composting doesn't have to be complicated or expensive to work.
Where the Real Cost Comes From (and How to Avoid It)
If cheap composting has a hidden cost, it's usually one of these:
- Buying compost anyway - because a cold heap only reaches 20-30°C and can take 6-12 months (or longer) to produce usable compost, many people end up buying bagged compost in the meantime
- Council green waste charges - many local authorities now charge £40-£60+ a year for garden waste collection
- Wasted food waste - cold composting can't safely handle cooked food, meat, bones or dairy, so it still ends up in the general waste bin
This is where a hot composter like HOTBIN changes the maths. Because HOTBIN naturally reaches composting temperatures of 40-60°C, it works up to 32 times faster than a traditional cold heap, turning waste into usable compost in as little as 30–90 days rather than months on end. That means:
- Less need to buy in bagged compost while you wait
- More usable compost harvested per year from the same bin
- No need to pay for council green waste collection, since garden waste goes straight in the bin
- The ability to compost cooked food, meat scraps, bones and weeds - waste a cold heap can't handle — so less goes to landfill and less goes in your bin
A Simple, Low-Cost Composting Routine
- Start with a base layer. Half-fill your bin before adding daily waste - the bacteria need a decent amount of material to get going and build up heat.
- Feed it 2-3 times a week. A steady supply of scraps and garden waste keeps the process (and the heat) going.
- Balance greens and browns. Too many wet greens on their own will turn slimy; mix in shredded paper, cardboard or woodchip to keep airflow and moisture in check.
- Leave it be. With HOTBIN there's no turning, no tumbling and no accelerators needed - the insulated design and natural heat do the work for you.
- Harvest and use. Once it's dark, crumbly and earthy-smelling, it's ready - use it as mulch, a potting mix, or to enrich beds and borders.
Which Bin Size Keeps It Cost-Effective?
The most cost-effective bin is the one sized to how much waste you'll realistically feed it each week:
- Around 2.5kg (5L) a week - roughly one small kitchen caddy → the HOTBIN Mini (100L) is the better fit
- Around 5kg (10L) a week - a typical family household → the HOTBIN 200L
- 20kg (40L) or more a week - bigger gardens, allotments or community plots → the HOTBIN Mega (450L/700L)
Choosing a bin that matches your actual waste output (rather than the biggest one available) keeps things efficient - an underfed bin just takes longer, it's not wasted money, but sizing it sensibly gets you compost faster.
FAQs on Inexpensive Composting
Is composting at home really cheaper than buying compost? Yes. Once you factor in the cost of bagged compost, mulch, soil improver and council green waste charges, most households save money within the first year or two of composting at home.
Can I make compost for free with no bin at all? Technically yes, with an open heap - but it composts more slowly, can attract pests, and is limited in what it can safely break down (no cooked food, meat or bones).
Does a hot bin cost more to run than a cold heap? No electricity or external power is needed - HOTBIN's insulated design captures and retains the heat generated naturally by the composting process itself.
How long before I get compost I can actually use? With a properly fed HOTBIN, as little as 30-90 days, compared to 6-12 months or more for a traditional cold compost heap.
Start Composting the Cost-Effective Way
Cheap composting doesn't mean waiting all year for a small tray of usable compost - it means turning waste you already have into something valuable, as quickly and simply as possible. Explore the HOTBIN range to find the size that fits your household and start cutting down what you send to landfill (and what you spend at the garden centre).