Do I need a Vitavia Base Plinth?

Yes, you'll definitely need some kind of base for your greenhouse. Here's why: The front door end of the frame sits a bit lower than the rest of the greenhouse. This means it needs to hang over something sturdy, like timber battens or a Vitavia Steel Perimeter base.

Why choose a Vitavia Steel Perimeter base?

It's a great option because it: Helps make sure your greenhouse is nice and square Keeps everything level before you start adding the glass Think of it as giving your greenhouse a solid foundation to stand on. It's like making sure your house has good footings – it just makes everything more stable and secure. Remember, a well-set base means a happier, longer-lasting greenhouse!

How do I prepare the base for my greenhouse?

For best results, build your greenhouse on a perfectly square and level slab or concrete base, or use anchor spikes if you have a Vitavia Base. You'll find the exact measurements and instructions for using the spikes in Section '0' of your assembly guide.

How is the Greenhouse Packaged?

Your greenhouse frame and base will arrive in long, thin boxes made of sturdy cardboard. The glass packaging depends on what you've ordered: boxed for horticultural glass, or as individual sheets for full pane toughened glass.

Where do I find the assembly instructions?

The assembly instructions will be in the main greenhouse box, and it will clearly state “assembly instructions in this box”. You can email us at sales@greenhousestores.co.uk and we can email them to you also.

How long does it take to build?

Building your greenhouse is typically a weekend project: set aside Saturday for the framework and Sunday for glazing. Remember, it's crucial not to leave the greenhouse partially glazed, and the time may vary depending on the size of your greenhouse.

Where should I start with my greenhouse assembly?

Begin by thoroughly reading the assembly instructions, then prepare the ground, assemble the base frame, build the greenhouse frame, and finish with glazing - in that order. Follow the instructions step-by-step, including the summary at the front of the manual, to ensure a smooth assembly process.

What if I'm missing parts or something is damaged?

If you discover any missing or damaged parts, don't worry - we're here to help! Simply email us at support@greenhousestores.co.uk with your order number, and we'll get in touch with you as soon as possible to resolve the issue.

Do you provide installation services?

If you're interested in this service, just add the Installation option above. One of our Professional Greenhouse Installers will install your new greenhouse for you. All we need is a properly prepared flat slab or concrete base to fit your greenhouse onto.

Call : 0800 098 8877

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£25 OFF Greenhouses!

Use code SUMMER25 at checkout min order £699 (Greenhouses)

Vitavia Neptune Greenhouse
Vitavia 8x12 Black Neptune 9900 Greenhouse - Horticultural Glass

Vitavia 8x12 Black Neptune 9900 Greenhouse

FREE Delivery 4 Weeks ⛟

SAVE £221

Click to enlarge - For illustration purposes.

Quick Code: P6411

SAVE £25 EXTRA

Use code SUMMER25 at checkout

8ft 5" wide x 12ft 6" deep
Black Powder Coated Frame
3mm Horticultural Glass
2 x Roof Vents
Single Sliding Door
High Ridge Height
Built in Gutters
12 Year Warranty
Easy to install

Greenhouse Dimensions

A: Greenhouse width

2570mm (8′ 5″)

B: Greenhouse depth

3830mm (12′ 6″)

C: Ridge height

2300mm (7′ 6″)

D: Eaves height

1350mm (4′ 5″)

E & F: Door Size

610mm (2′) x 1860mm (6′ 1″) (aperture)

Minimum Base Size

2570mm (8′ 5″) x 3830mm (12′ 6″)

Customise your Greenhouse

More Sizes:

8x8
£864

8x10
£919

8x12
£1,029

Select your Glazing:

Which glass do I need?

Horticultural Glass

This is standard greenhouse glass with 2' x 2' panes that overlap and join with S clips. This glass breaks into shards.

Toughend Glass

Recommended! Toughened Glass is much stronger than Horticultural glass and won't crack. If it does break it disintegrates into hundreds of small pieces.

Polycarbonate Glazing

Polycarbonate Glazing is ideal for family gardens where safety is the No 1 priority. It's virtually unbreakable and won't shatter.

Horticultural Glass
£1,029

Toughened Glass
£1,265

Polycarbonate
£1,244

Select your Colour:

Silver
£949

Black
£1,029

Add a Base Plinth (Recommended):

Add a galvanized steel base plinth for strength and stability.

Do I need a Base Plinth?

Add a galvanized steel base plinth for strength and stability. Ideal for placing straight onto slabs or concrete. Includes corner posts for soft ground installations. Your greenhouse MUST sit on a raised plinth. You can build one from bricks, timber or easiest is to buy this base plinth with your new greenhouse.

No Base
£0

Choose this option If you are building your own raised Brick Plinth

Save £32

Vitavia Black Steel Base
£123

Add a black steel greenhouse base for strength and stability. Ideal for placing straight onto slabs or concrete. Includes corner posts for soft ground installations. RECOMMENDED OPTION!! You WILL need to add this base plinth for building your greenhouse onto slabs, concrete or soil. Otherwise you will need to build your own brick base plinth!!

Get it installed by Professionals:

Installation requires that you purchase the Base Plinth Option if one is available. You MUST have a surface of slabs, concrete or decking. NOT soil or gravel.

Get it installed by Professionals?

Please Note: Installation requires an optional base plinth (if available) on a flat, level surface like slabs, concrete, or decking that meets the minimum base size. The package includes the greenhouse, ventilation, and downpipes only; accessories and groundwork are excluded. Installation will be carried out 2-8 weeks after the delivery of your Greenhouse.

Installation is available in these postcode areas, if your area is not shown, please contact us directly.: B, BA, BB, BD, BL, BN, BS, CA, CB, CH, CO, CR, CT, CW, CV, DA, DE, DH, DL, DN, DY, EH, GL, GU, HD, HG, HP, HU, HX, IP, KA, KT, LA, LE, LL, LN, L, LS, M, ME, MK, ML, NE, NG, NN, NR, OX, OL, PE, PR, RG, RH, SE, SG, SK, SM, SN, ST, SW, SY, TF, TN, TS, TW, WA, WF, WN, WR, WS, WS, WV, YO.

No Installation
£0

Installation
£600

Add Staging?

£10 off

1 Tier Staging Silver

+ £69

Single Tier Vitavia Silver Staging gives you a handy work surface and storage area. Dimensions: 76cm (H) x 50cm (D) x 120cm (W)

Qty 1

£11 off

2 Tier Staging Silver

+ £88

2 Tier Vitavia Silver greenhouse staging gives a work surface with extra storage underneath. Dimensions: 76cm (H) x 50cm (D) x 120cm (W)

Qty 1

£6 off

Top Tier Staging Extension Black

+ £39

Extra Black Shelf attaches to the top of 1 or 2 Tier staging.1 or 2 Tier Staging NOT INCLUDED.

Qty 1

£10 off

Silver Shelf

+ £29

Sturdy useful aluminium shelf that fixes to side of greenhouse. 122cm x 15cm

Qty 1

£23 off

2 Tier Staging Black

+ £96

2 Tier Vitavia Black Staging gives you a work surface with extra storage underneath. Dimensions: 76cm (H) x 50cm (D) x 120cm (W)

Qty 1

£10 off

Black Shelf

+ £49

Black aluminium shelf that fixes to side of greenhouse. 122cm x 15cm

Qty 1

Staging information

1 Tier Staging Silver - £69.00

Single Tier Vitavia Silver Staging gives you a handy work surface and storage area. Dimensions: 76cm (H) x 50cm (D) x 120cm (W)

2 Tier Staging Silver - £88.00

2 Tier Vitavia Silver greenhouse staging gives a work surface with extra storage underneath. Dimensions: 76cm (H) x 50cm (D) x 120cm (W)

Top Tier Staging Extension Black - £39.00

Extra Black Shelf attaches to the top of 1 or 2 Tier staging.1 or 2 Tier Staging NOT INCLUDED.

Silver Aluminium Shelf - £29.00

Sturdy useful aluminium shelf that fixes to side of greenhouse. 122cm x 15cm

2 Tier Staging Black - £96.00

2 Tier Vitavia Black Staging gives you a work surface with extra storage underneath. Dimensions: 76cm (H) x 50cm (D) x 120cm (W)

Black Aluminium Shelf - £49.00

Black aluminium shelf that fixes to side of greenhouse. 122cm x 15cm

Add Ventilation?

£8 off

Auto Roof Vent Opener

+ £38

Autovent to automatically opens your roof vent to ventilate your greenhouse when it becomes too hot.

Qty 1

£20 off

Louvre Window Black

+ £45

A louvre window brings fresh cool air into your greenhouse to moderate the temperature inside. An essential add on.

£1 off

Auto Louvre Opener

+ £48

Automatically opens your louvre window for you when you’re not around. Louvre Window not Included.

Ventilation information

Auto Roof Vent Opener - £38.00

Autovent to automatically opens your roof vent to ventilate your greenhouse when it becomes too hot.

Louvre Window Black - £45.00

A louvre window brings fresh cool air into your greenhouse to moderate the temperature inside. An essential add on.

Auto Louvre Opener - £48.00

Automatically opens your louvre window for you when you’re not around. Louvre Window not Included.

Add Extras?

£9 off

Rainwater Downpipe Kit

+ £16

Kit contains 2 x Downpipes to collect the rainwater from both gutters on your greenhouse.

£10 off

Screwhooks

+ £7

Handy screwhooks fit into the frame of your greenhouse to attach wire or string to for growing vine plants like tomatoes. Pack of 10.

Qty 1

£7 off

Water Butt Connecting Kit

+ £17

Flexi Hose and connector to connect your Vitavia Downpipe to your Water Butt.

Qty 1

Extras information

Rainwater Downpipe Kit - £16.00

Kit contains 2 x Downpipes to collect the rainwater from both gutters on your greenhouse.

Screwhooks - £7.00

Handy screwhooks fit into the frame of your greenhouse to attach wire or string to for growing vine plants like tomatoes. Pack of 10.

Water Butt Connecting Kit - £17.00

Flexi Hose and connector to connect your Vitavia Downpipe to your Water Butt.

Add Black Cresting?

Vitavia Black Roof Cresting

+ £115

Vitavia Ridge Crestings in black for a traditional look. Also keep birds off your greenhouse roof.

Black Cresting information

Vitavia Black Roof Cresting - £115.00

Vitavia Ridge Crestings in black for a traditional look. Also keep birds off your greenhouse roof.

12 Year Warranty
Free UK Delivery
Expert Installation Available

Was £1250.00

£1,029

Spring Sale - £221 OFF

🚚

FREE* delivery Within 4 Weeks

* Some areas may incur a delivery charge.

Limited Spring Stock

£1029

FREE Delivery 4 Weeks ⛟

Need Help Choosing?

📞 0800 098 8877

CALL US FOR A GREAT DEAL

Description
Features
Delivery
Dimensions

The 8x12 Vitavia Neptune 9900 Black Greenhouse is a superb 8ft wide large greenhouse at a great price !

The Neptune Greenhouse is a spacious greenhouse for keen growers. An 8ft wide greenhouse gives those with a bit more space the ability to grow large crops in a very comfortable space big enough for all your growing needs.

This Vitavia Neptune 8x12 has 2 opening roof vents for ventilation, a smooth sliding single door, powder coated Black finish and integral gutters.

2570mm (8ft 5") Wide Aluminium Greenhouse - Practical width for serious growing.
3mm Horticultural Glazing - Great Light Transmission .
2 Opening Roof Vents - For good ventilation.
Black Powder Coated Aluminum Frame - No rust or discoloration!
Single Sliding Door - Door can be held at any desired position.
High Eaves (1350mm) - For Optimum Growing Height.
Integrated Gutters - Collect all that lovely rain water for your plants.
Extra Bracing and Corner Plates - for strength in roof and corners.
Optional 60mm Galvanised Steel Base Available Below - For rigidity and strength.
12 Year Warranty - on frame and base.
PLEASE NOTE - Image shows 8x12 with Toughened Glass.

Delivery is currently Within 4 Weeks to UK Mainland for Greenhouses, 3-5 Working days for Accessories only.

Optional Installation: If selected, Installation will be carried out 1-8 weeks after the delivery of your Greenhouse. The Installation Team will contact you directly to book in your installation.Our installation service requires a level concrete, slabbed, or decked area to the minimum size stated on the website. Failure to provide a suitable base area may result in you being charged for the failed installation. If you require staging or shelving assembly, you can arrange it directly with the installation team.