JUSTBASES
Professional greenhouse base installation

Greenhouse Bases — Level, Durable, Built for Drainage.
Guaranteed for 10 Years.

A perfectly level base is essential for your greenhouse — glass panels won't sit properly on an uneven surface, and good drainage protects your plants. Professional installation across Dorset & Hampshire, from £510.

Get a Free Greenhouse Base Quote Call Craig
10-Year Guarantee
50+ Years Experience
Dorset & Hampshire
Fixed Price Quotes

Why Your Greenhouse Needs a Proper Base

A greenhouse base must be perfectly level — glass panels won't sit properly on an uneven surface. Even a few millimetres of deviation creates gaps between the frame and glass, causing heat loss, draughts, and water ingress that damages your plants and makes temperature control impossible.

Drainage is equally critical. Water must drain away from your greenhouse, not pool around the base. Standing water encourages root rot, fungal disease, and creates a breeding ground for slugs and pests. A properly installed base ensures rainwater drains freely and naturally.

The base also protects against ground frost heave — seasonal freezing and thawing that shifts soil and can crack greenhouse glass. And most greenhouse manufacturers require a proper base for their warranty to remain valid. At JustBases, we build every greenhouse base to within ±3mm tolerance, with drainage designed in from the start.

Choose the Right Greenhouse Base

Three base types suited to different greenhouse sizes, sites, and budgets. Not sure which is right? Call Craig for free advice.

Paving Slab Base

Paving Slab Base

The Primary Choice for Greenhouses

Ideal for: Most greenhouses of all sizes — neat, attractive, excellent drainage

High-quality paving slabs laid on a prepared sand and cement bed over compacted hardcore. The most popular greenhouse base for good reason — slabs are naturally permeable, allowing water to drain freely rather than pooling around your plants. We level every slab to within ±3mm, ensuring your glass panels sit perfectly and seal properly. The neat, attractive finish complements any garden.

Advantages
  • Naturally permeable — excellent drainage
  • Level to ±3mm for perfect glass fitting
  • Clean, attractive finish
  • Ready for immediate greenhouse erection
Considerations
  • Requires relatively flat ground
  • Not ideal for very large or heavy commercial greenhouses
  • Ground preparation needed for stability
From £510 (9' x 5')
Poured Concrete Base

Poured Concrete Base

For Larger & Heavier Greenhouses

Ideal for: Large greenhouses, heavy structures, solid-floor requirements

A steel-reinforced concrete slab provides maximum strength for larger or heavier greenhouses. We excavate to stable ground, lay a compacted MOT Type 1 sub-base, and pour high-grade C30 concrete levelled to within ±3mm. Ideal if you want a solid, easy-to-clean floor inside your greenhouse, or for structures over 12 feet long. We can incorporate drainage channels or a slight fall to manage water runoff.

Advantages
  • Maximum load-bearing capacity
  • Solid, easy-to-clean floor surface
  • 50+ year lifespan
  • Drainage channels can be incorporated
Considerations
  • Requires 2-3 days curing before greenhouse placement
  • Less naturally permeable — drainage must be built in
  • Needs vehicle access for concrete delivery
From £595 (8' x 6')
Ground Screw Base

Ground Screw Base

For Slopes & Protected Trees

Ideal for: Sloping sites, near TPO-protected trees, eco-sensitive locations

Galvanised steel screws driven directly into the ground using specialist machinery, with a timber frame bolted on top. No excavation, no concrete, no curing time — your greenhouse base is ready the same day. The only base type suitable for working near TPO-protected trees, and ideal for sloping gardens where traditional bases would require expensive excavation and levelling.

Advantages
  • Works on sloping sites without excavation
  • Tree-root friendly — no damage to TPO trees
  • Same-day installation — no curing time
  • Fully reversible if needed
Considerations
  • Higher cost than slab or concrete for standard sites
  • Requires specialist installation equipment
  • Not suitable for very rocky ground
From £1,650 (8' x 6' with frame)

Slabbed Greenhouse Base Prices

Fixed prices for slabbed greenhouse bases. All prices include materials, labour, and waste removal.

Size Price
9' x 5' £510
9' x 7' £670
11' x 7' £785
11' x 9' £955
13' x 9' £1,070
13' x 11' £1,235
15' x 11' £1,350
17' x 11' £1,465
19' x 11' £1,630
21' x 11' £1,745

Prices are for slabbed greenhouse bases. Concrete bases available at alternative pricing — see our full price list.

Get Your Free Quote View Full Price List

Your Perfect Greenhouse Base in 3 Simple Steps

1

Tell Us About Your Greenhouse

Share your greenhouse make, model, and base dimensions, along with a photo of where it's going. We'll recommend the best base type and confirm the exact size needed.

2

Get Your Fixed Quote

We provide a clear, fixed-price quote including materials, labour, and waste removal. No hidden extras — the price we quote is the price you pay.

3

Base Installed, Greenhouse Ready

Our expert team arrives on schedule and completes your base — typically within a single day — leaving your garden pristine and ready for greenhouse erection.

Craig Phillips

Greenhouse Bases Built to Manufacturer Specs

"Every greenhouse is different — Halls, Elite, Swallow, Rhino — and they all have specific base requirements. I work to your manufacturer's exact specifications so your glass fits perfectly, your doors open and close properly, and your drainage works as it should. A greenhouse base needs more precision than a shed base — we level to within ±3mm and make sure water drains away, not towards your plants. Give me a call and I'll talk you through the options."

Call Craig: 01202 039753 Get Online Quote

What Our Customers Say About Their Greenhouse Bases

"Installed to a very high standard. Very quick and very clean and tidy. Would certainly recommend this company."

— Verified Reviewer, BH21

"The team are extremely hard working but most important to me is the quality of their workmanship."

— Verified Reviewer, SO53

"Craig clearly takes pride in his work and they always leave the garden immaculate."

— SP5

Greenhouse Base Installation Near You

We install greenhouse bases across Dorset, Hampshire, the New Forest, and South Wiltshire. Find your local service page for area-specific information.

Ready for Your New Greenhouse Base?

Get your free, no-obligation quote today. Most bases installed in a single day.

Get Online Quote Call: 01202 039753

Greenhouse Base FAQs

Paving slabs are the most popular choice for greenhouse bases. They provide a perfectly level surface essential for glass panel fitting, they're naturally permeable so water drains freely rather than pooling, and they look neat and attractive. For very large or heavy greenhouses, a poured concrete base offers maximum strength — we can incorporate drainage channels to manage water runoff. Both types come with our 10-year written guarantee.