Mercia Traditional Lean To Greenhouse - 8 x 4ft

Mercia Traditional Lean To Greenhouse - 8 x 4ft

Product code
Mercia Traditional Lean To Greenhouse - 8 x 4ft is rated 2.4 out of 5 by 9.
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In Stock

FREE Delivery to most of UK Mainland

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  • Overview
  • Reviews (9)
  • Delivery
  • Returns

Make the most of your garden and outdoor space with this traditional lean to greenhouse form Mercia Garden products.

The Pent Greenhouse is the ideal building for growing your plants in. This is an extremely well built, good quality building constructed using 12mm tongue and groove cladding, 44x28mm framing, fully glazed styrene windows, one skylight window, a doorknob and turn button latch.

The door panel can be fitted to either end during construction to ensure you make the most of your greenhouse.

(Please note: Images are dressed and painted for display purposes only. All listed metric dimensions listed below include the roof overhang.

Features and Benefits

  • Durable – This sturdy and strong garden building is constructed from robust timber and joints giving you a long-lasting and resilient structure.
  • Decorate yourself – Paint, stain or leave it natural, this greenhouse gives you the chance to customise it to how you want it.
  • Self-assembly – This is a two-person job but can be completed without any professional help needed. All assembly instructions are included.


  • 12mm Tongue and Groove Cladding
  • 44x28mm Framing
  • Fully Glazed Styrene Windows
  • One Skylight Window
  • Doorknob and turn button latch. 
Name 8x4 - Traditional Lean To Greenhouse



Base Width




Base Depth


Ridge Height


Eave Height


Internal Width


Internal Depth


Internal Ridge Height


Internal Eave Height



12mm Shiplap

Floor & Roof

Styrene Roof

Door opening width(All dimensions in mm


Door opening height (All dimensions in mm)


Lock type

Turn Button


Water Based Dip Treatment


10 Year Anti Rot - Requires annual treatment with a high-quality preservative that weatherproofs and protects against rot

View Swift Foundations range of shed bases and roofing kits HERE

Reviews (9)
Rated 5 out of 5 by from Exactly what we wanted. Very happy with this product. It was easy to assemble and looks great.
Date published: 2021-03-02
Rated 1 out of 5 by from Not too happy with the experience! The greenhouse was delivered, more like thrown from a distance. The delivery driver was off quickly. There was several parts of the wooden structure broken, and several panes of Styrene were broken. We also purchased a summer house from you last spring, where we had similar problems, mainly due to again the delivery people. The only redeeming factor was that the broken items were replaced, once I informed you of the damage. I am reluctant to recommend you to friends as your delivery team is the cause of the damage to my purchases in both cases.
Date published: 2021-02-14
Rated 2 out of 5 by from Missing parts and badly constructed bits It started off well. Delivery was incredibly efficient and it all looked great. Then I came to building it. The instructions aren’t brilliant, but with a bit of common sense you can work it out. Pieces were missing out of our order. I am in contact with the company to get those re-delivered. I have a feeling it happens regularly from the response I got. One part of the greenhouse was so badly constructed that I had to take it apart and re-make it myself. The crossbar was about an inch out at one end and a massive nail was sticking out where it should have been.
Date published: 2021-01-19
Rated 1 out of 5 by from Terrible product not for amatures! Terrible. Thank god I had professionals put it together. Wood splitting, nothing fitted properly. Took ages to work out what bit was what and most of the wood had to be cut to the right length. Plus additional wood had to be bought and a second door handle.
Date published: 2020-12-15
Rated 5 out of 5 by from Great product This arrived a lot sooner than I thought, Great service easy to order.
Date published: 2020-10-22
Rated 1 out of 5 by from A disappointing purchase of a poor quality shed The greenhouse arrived after two months with 11 pieces damaged or missing, and other pieces split. The manufacturer has promised to replace these parts (within 21 days), save for some split pieces which I was told was a natural characteristic of the wood, and that I should fill these with wood filler. The wood is un-tanalised softwood, very thin and flimsy and in order to qualify for the "wood rot guarantee" you have to paint it immediately (with a wood preservative) and also prove that you have re-painted it every year.
Date published: 2020-06-30
Rated 2 out of 5 by from Agree with ‘Ali the Idiot’ Bought this greenhouse to replace a smaller, aluminium greenhouse that I had for nearly 20 years. Good points: 1. Purchase was easy. 2. Price was fair. 3. Although the initial delivery was cancelled on the day of delivery, the second delivery was efficient with excellent service from friendly delivery guy. 4. Turned out to be a nice size greenhouse for a small sized area. Bad points: 1. Purchasing mostly the bits for a complete self build, with much more work to build than expected. 2. Instructions were missing a page. The first sign of quality control issues. (This was quickly resolved by a quick call to the service department and instructions were sent via email.) 3. None of the pieces were labelled, meaning that it was difficult to identify the correct pieces as the build progressed. 4. Wood started to sweat and warp almost immediately on delivery. 5. Construction of the greenhouse was fiddly and required a proficiency in DIY that I did not have (luckily provided by my neighbour) and I would have struggled to build it without experienced help. 6. Wood pieces incorrectly sized and not cut to required length, requiring bespoke fixing. Quality control again missing. 7. Nails protruding from some of the wooden parts needing nails to be hammered flat (continuing the theme of lack of quality control). 8. Not all wood provided had been fully protected, with some wood clearly sprayed on one side but not the other. Again a quality control issue. 9. The greenhouse is smaller than 8x4 inside, and therefore standard staging cannot be bought or used (not an issue for me as I always intended to build my own bespoke benches). 10. Very drafty and water leaks through the roof. In winter this would be a significant issue. I will therefore need to spend another weekend soon making it waterproof and reducing the numerous gaps - especially around the door. Despite the issues, I am actually happy with the greenhouse now it is built and would have still bought had I known about my issues.
Date published: 2020-06-29
Rated 1 out of 5 by from Do not bother! It’s poorly manufactured, nails not straight, split wood. The parts are not cut correct to size, none are labelled. The instructions are useless. Please note that you need to treat it too. Do this before you erect it. Oh well.
Date published: 2020-05-07
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Vendor Direct Products:

This product is delivered for FREE by our approved supplier on a Standard Delivery Service.

Please be aware that we currently cannot arrange for delivery of this product to the following postcodes: AB, FK, HS, IV, KA, KW, PA, PH, ZE, LL58-LL78, IM, TR, BT, PO30-41.



In the UK you have a legal right, under the Consumer Contracts Regulations June 2014, to cancel your order within fourteen (14) days following your receipt of the goods. Refunds for orders cancelled under the provisions of the Consumer Contracts Regulations will be processed in accordance with your legal rights.

You may not cancel orders for the following types of products:

  • Electrical/Technical products which have been unsealed
  • Customised or bespoke Products
  • Anything of a nature that for hygiene or associated health and safety - this includes the Outdoor Spas, Mattresses and Divan Sets
  • Fresh food

Under the Consumer Contracts Regulations June 2014 you have a duty to take reasonable care of Products whilst they are in your possession. You will receive a full refund of the purchase price of the Products.

This is not intended to be a full statement of your rights under the Consumer Contracts Regulations. Full details of your rights are available from your Local Authority’s Trading Standards Office.

How To Return A Product

If you wish to return your item to Robert Dyas, you can do so by the following method:

1. Request a Collection via Robert Dyas Customer Services

Contact our Customer Services team on 0333 103 6677 (Monday- Friday 08:00 - 19:00, Saturday 09:00 - 17:00, Closed Sunday & Bank holidays. - call charges may vary by network) or via email to: [email protected] who will be able to arrange a collection for your item with the supplier. Please ensure that you provide your order number when contacting customer services.

If you are returning the item under your 14 day right to cancel, then a collection charge will be applied:

  • Products < 20kg: £7.50
  • Products > 20kg: £30

If you are not at home when we try to collect we reserve the right to deduct from your refund or charge your credit card the direct costs to us of the failed return in accordance with the Consumer Protection (Distance Selling) Regulations 2000.