Best Base for a Greenhouse: Concrete vs Gravel vs Timber

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Greenhouse Base Comparison: Concrete vs Gravel vs Timber

Base Type Lifespan Best For
Concrete 20+ years Permanent greenhouses or heavy-duty growing setups
Gravel 10–15 years Well-ventilated greenhouses and budget-friendly builds
Timber Frame 5–10 years Lightweight or temporary greenhouses on a budget

Concrete Base

  • Extremely strong and level — great for anchoring a permanent greenhouse.
  • Low maintenance — won’t rot, shift, or settle over time.
  • Protects against weeds and pests entering from below.

Concrete Base

  • Poor drainage — you may need to install channels or internal gravel trays.
  • More expensive and labour-intensive to install.
  • Harder to remove or adjust once in place.

Gravel Base

  • Excellent drainage — prevents waterlogging and rot inside the greenhouse.
  • Quick and easy to lay with minimal tools.
  • Affordable option that still supports most lightweight greenhouse frames.

Gravel Base

  • Needs good edging to hold everything in place.
  • Can shift over time without a compacted sub-base.
  • Less solid underfoot — shelving may need anchors or slabs on top.

Timber Frame Base

  • Lightweight and easy to build — perfect for DIYers and small greenhouses.
  • Cost-effective and adjustable on uneven ground.
  • Can be installed without digging or concrete if anchored well.

Timber Frame Base

  • Shorter lifespan — wood can rot without proper treatment or airflow.
  • Less stable for large greenhouses or windy areas.
  • May require regular maintenance and leveling.

What Makes a Good Greenhouse Base?

  • ✔ Level and stable

    A good base needs to be completely flat to prevent frame twisting, door misalignment, and long-term stress on your greenhouse structure.
  • ✔ Strong enough to hold the frame

    Whether it’s a glass or polycarbonate greenhouse, the base must support the weight without shifting or sinking — especially after heavy rain or frost.
  • ✔ Allows for good drainage

    Standing water leads to rot, mould, and damaged plants. A well-drained base helps control humidity and keeps your growing space dry and functional.
  • ✔ Anchors the greenhouse securely

    Wind is the #1 cause of greenhouse damage. A base should allow for anchor bolts or fixings so the frame stays put in bad weather.
  • ✔ Matches your usage and budget

    For a permanent setup, concrete is best. For lighter use or easy install, gravel or timber may be enough — but always consider the long-term goals.
🔹 Can I put a greenhouse straight on soil?
You can, but it’s not ideal. Soil shifts with weather and won’t stay level over time. Without a solid base, the greenhouse may become uneven, unstable, or damp. A compacted sub-base with gravel, timber, or concrete offers much better long-term support and drainage.
🔹 Is concrete or gravel better for a greenhouse base?
It depends on your priorities. Concrete is stronger, permanent, and easy to clean — great for all-year use. Gravel drains better, costs less, and keeps humidity under control. For most gardeners, gravel is ideal unless you’re installing a heated or very large greenhouse.
🔹 Does a greenhouse need to be anchored down?
Yes — even lightweight greenhouses can lift in strong wind. Whether it’s bolted to concrete, pegged into timber, or fixed with anchors in gravel, securing the frame is a must for safety and stability, especially in exposed or windy areas.
🔹 What’s the cheapest base for a small greenhouse?
A simple timber frame or compacted gravel bed is usually the cheapest option. These can be built with minimal tools and materials. Just make sure the ground is level and well-prepared, or you’ll run into issues with movement and frame alignment.

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