Builder’s Bag Kelpie Compost

£72.00 inc VAT

Caledonian Kelpie Compost contains a unique blend of seaweeds containing over 80 minerals, trace elements, vitamins and natural plant hormones. Ideal for adding nutrients, and boosting plant survival and growth.

Also available in small 40L bags here.

Calculate your volume requirements here.

(110 customer reviews)
SKU: WEBBBKELP Category: Tags: ,

This unique, high-performing soil improver is made from a blend of green and woody material and a variety of seaweeds found in the cold, clean, nutrient-rich waters of the North Sea. The seaweed is harvested locally from beaches throughout Scotland and, as such, is an entirely renewable resource.

It contains over 80 minerals, essential trace elements, vitamins and natural plant hormones including Cytokinins, which stimulate plant growth. Our Kelpie Compost is BSI PAS 100 certified.


Available in small 40L bags or in approx 850L builders bags.


  • Soil improver
  • Tree and shrub backfill mix
  • Planting shrubs, bulbs and herbaceous plants
  • Plant mulch
  • Turf top dressing
  • Turf establishment


  • Enhanced soil texture and moisture retention
  • Increased levels of organic matter
  • Increased nutrients reducing fertilizer requirements
  • Addition of soil microorganisms and fungi may help suppress some soil-borne plant diseases
  • Reduction of soil compaction and erosion
  • Improved plant survival and growth


Please note delivery of all bags are made in bulk and offloaded mechanically from the roadside. We DO NOT carry bags manually into your property.

Builders Bags – Single bag delivery fee is £15 to a local postcode, orders of 2 or more qualify for free local delivery.

Small Bags – Minimum order for delivery is 5 bags, orders of 40 bags or more will qualify for free local delivery.

Small bags of Kelpie Compost can also be ordered using the click and collect service available on the the small bags product pages.

110 reviews for Builder’s Bag Kelpie Compost

  1. Nay Tyner (verified owner)

    Having bought both— it’s definitely worth spending more for this!

    Absolutely perfect compost, you can’t ask for more! Light, rich, full of goodness, excellent consistency. The best available for bulk delivery that I’ve found, and I’ve tried everything. You won’t regret it.

  2. Claire Poustie (verified owner)

    Great compost – I was very impressed with the prompt service and delivery. Driver was courteous and helpful. Compost is fantastic and I really noticed the difference in my plants.

  3. Elizabeth Bee (verified owner)

    Excellent compost! Although it costs more I always buy one of the kelpie compost alongside the green goddess. My garden likes it too.

  4. Maggie Stewart (verified owner)

    Wonderful product, quick delivery. Perfect.

  5. Sam O’Neill (verified owner)

    Excellent value, local, prompt delivery, helpful staff, helped me massively reduce black plastic use, good quality.

  6. Rory Shiells (verified owner)

    As a professional gardener, i can’t recommend the kelpie compost enough. I use it on all the gardens I work on throughout Edinburgh with great flowering results.

  7. Sheila Sim (verified owner)

    Great peat free compost which I use for making my own potting mix, and to mulch my plants.

  8. Liz Finlayson (verified owner)

    Excellent compost. Good value for money when bulk buy. Will be reordering soon.

  9. Sheila Monteith (verified owner)

    Excellent for my rosebuds. Lovely blooms all summer long.

  10. mike smith (verified owner)

    This compost is very effective and seems to be a sustainable formulation.
    I’d like to hope that a procedure can be found to allow the bags to be reused!

  11. Shona St George (verified owner)

    excellent product and great delivery

  12. Hugh Perfect (verified owner)

    Excellent soil improver. Noticeable improvement in soil texture and subsequent plant growth. Highly recommended

  13. Hugh Nicolson (verified owner)

    1st class product. We are now on our third bulk bag as we reclaim a large neglected garden. Showed a sample to our local nursery and they were impressed with the quality.

  14. Michael Boyle-Ronaldson (verified owner)

    I was quite amazed by my Onion crop having given them a top dressing after planting, 500gram onions from cheap sets bought from the BM Store. Raspberry’s continued to crop from June till December, possibly due to Global Warming but I think mostly due to the Kelpie.

  15. Mariusz (verified owner)

    Good produkt very fast delivery

  16. Trevor Higley (verified owner)

    Lovely compost
    Shame no free gifts

  17. Allan lindsay (verified owner)

    Very good compost, top dressed all my garden, and results good.

  18. David Miller (verified owner)

    I usually buy a large bag of compost every year which I find to be excellent. It has revived some small trees & shrubs beyond recognition.

  19. E. A (verified owner)

    Great product

  20. John munro (verified owner)

    Large allotment best compost and great texture ,I have order from other outlets and must say this is the best. Will be ordering more bags soon just built raised beds and will be trying no dig policy

  21. Sarah Tolley (verified owner)

    excellent compost!

  22. G Wallace (verified owner)

    Pleased with this product and my garden shows the benefits from it. I would buy again

  23. John Stewart-Young (verified owner)

    We have heavy clay soil so keep adding green goodness and compost to loosen and enrich it.This compost is great to buy in bulk.

  24. Nicola Gordon (verified owner)

    Excellent service and excellent compost

  25. Jenny G (verified owner)

    I was very pleased with the compost and will order more when needed. The driver was especially helpful and the service was prompt and efficienct.

  26. Moira Penman (verified owner)

    Brilliant stuff which I have used in many situations all around the garden and will most certainly be ordering again.

  27. Fiona M (verified owner)

    I bought this to mix in with and as a top layer to new topsoil in large raised beds. The plants have rooted very quickly and flowered well – would definitely buy again and recommend the kelpie compost. It’s very light.

  28. robert stock (verified owner)

    A beautiful friable, finely milled, evenly mixed compost. Have mixed in with heavy soil to make a much improved flower bed and bedding plants on it are doing fine. Have also done the same with deep beds and the resultant tilth is excellent (although not tested for germination or cropping yet). A great peat free product.

  29. Dave Bubbs Menzies (verified owner)

    Excellent service & product. Delivery driver was especially helpful as the drop was quite awkward.

  30. Peter Jackson (verified owner)

    First class compost ideal for vegetable growing

  31. Keith Lewis (verified owner)

    Excellent product at a very, very good price with efficient service. On top of that, it’s local! Will definitely order again.

  32. Sue Atkinson (verified owner)

    The compost was great and plants have one well as a result. A twenty year old rowan even produced a few berries, not having done so beefier. Thank you.

  33. Bob Page (verified owner)

    The bag of compost was crumbly and full of goodness. Used in raised beds with good results.

  34. Corrinne Johnston (verified owner)

    I bought the Kelpie Compost and topsoil together in January. Delivery was prompt and efficient, a very helpful driver. The products are of superb quality, I shall definitely be giving this company all my future business.

  35. U Wright

    This is fantastic stuff. Planted courgettes in a sack of this and they were amazing

  36. Margaret Bond (verified owner)

    wonderful compost! Quickly delivered and placed exactly where we wanted

  37. U Wright

    Excellent for courgettes, fantastic crop when planted in ‘hills’ of Kelpie

  38. Jules (verified owner)

    Kelpie compost is brilliant, super quality. Delivery prompt and extremely helpful driver who placed the bags in just the right place. Would be great if they also offered multi-purpose compost for seeds.

  39. Sharon Young (verified owner)

    The Kelpie compost is brilliant.. our fourth delivery. We are using it to improve our rather poor soil, has been wonderful for my new raised beds as well.Really helpful staff at the end of the phone and delivery drivers very obliging. thank you !

  40. william Horsburgh (verified owner)

    After buying and using more than 30 builders bags of top soil, green goodness and kelpie soil in my allotment over the last 2 years i would highly recommend the products and the helpful guys who deliver it, would’nt go anywhere else.

  41. David Brading (verified owner)

    My first time using Kelpie Compost.
    Delivery was brilliant. Product looks great. A rich, black compost material that was still producing heat as I spread it over my garden and in my greenhouse.
    I have used it as a potting compost as well and all my seedlings are looking really healthy. I would certainly recommend and I will be using this product again.
    Fantastic service.

  42. Andrew (verified owner)

    First time ordering this, I’ve ordered the Green Goodness before. It is nice, maybe finer with less large particles although that may just have been the batch. I mixed it 50/50 to give it all a bit of a boost so we’ll see how it goes this year. Used as mulch, potting up plants and for in planters and it’s good. I’ll wait to see if the added seaweed has a noticeable effect by summer. I would recommend, the bulk bags go a long way and are good value

  43. Ottilie Miller (verified owner)

    I love Kelpie compost and put it on all the gardens I look after. Caledonian horticulture will deliver anywhere and no driveway is too awkward! Always a pleasure to work with.

  44. Michael Boyle-Ronaldson

    Kelpie is amazing doubling the size of all my veg last year.

  45. Bill (verified owner)

    Perfect, just what I expected to get.

  46. Nicola (verified owner)

    Too early to say much other than it certainly looks very good quality and I will likely buy from them again.

  47. Moira (verified owner)

    Second time I have bought the dumpy bags as it is brilliant stuff and my garden is thriving on it. Any time I need a compost this is my go to choice. Highly recommend

  48. Kate (verified owner)

    Fantastic quality of the soil, my plants love it and thrive in it.
    Few weeks in and its amazing to see how well everything is growing.

  49. Eric Iwa (verified owner)

    Great quality at fantastic price. Helpfull delivery driver.

  50. Judith Jackson (verified owner)

    Great compost, quick delivery, happy customer!

  51. AlisonS (verified owner)

    Really like the quality of the Kelpie Compost and delivery was relatively straightforward receiving x2 one ton bags. The driver was very helpful and pleasant. I know we’ll still need to feed the plants in due course, but so far the entire area is doing well after c. 6 weeks. As it’s a great quality soil, it does make the border area take on an impressive even look.

  52. Dot Stuart (verified owner)

    Yes very good compost. Delivery smashing phoned to say he was at the community garden. Giving me time to get others to help barrow it in.

  53. Elizabeth Spence (verified owner)

    An excellent product delivered promptly -thank you!

  54. Elizabeth Spence (verified owner)

    Thanks once again for such an excellent product.

  55. Terry Soutar (verified owner)

    First time buyer but won’t be the last. Great compost, rich, soft, easily broken up. Using for both flower beds and vegetable raised beds. Definitely seeing stuff come through and flowers blooming. Will definitely use again.

  56. Kate Smith (verified owner)

    This is great compost, definitely worth the cost and relatively modest delivery charges. The compost looks rich and pleasingly dark, very fine tilth, perfect for garden or allotment.

  57. Alastair Davidson (verified owner)

    Very good compost to work with. Many of the peat free composts on the market now have too much coir . Kelpie is quite different and the texture is ideal for moisture retention without water-logging. The seaweed nutrients are an added bonus for plant health.

  58. Yvonne Skinner (verified owner)

    My first foray into bulk buying compost & I wasn’t disappointed. The compost was really even & easy to work with – my new raised veggie beds appear to be flourishing! I would happily use this product again. The delivery driver was great too – really polite & helpful.

  59. Stewart Mcintosh (verified owner)

    Excellent product and super delivery service.

  60. Moira (verified owner)

    Brilliant stuff which really helps my garden thrive. Only downside is how quickly 2 dumpy bags disappear lol. Will definitely buy again.

  61. Tasneem (verified owner)

    Hi Thank you for the compost, it’s perfect for our Community garden..

  62. Katie Murray (verified owner)

    This is the first time that I have used Kelpie. I have made up a mix of 2 parts top soil (from Caledonian Hort) with 1 part Kelpie which I use for large containers. The Kelpie is very free draining but the top soil mix helps to retain the moisture and provides structure. So far, everything is thriving. I add extra mulch to the top of the pots because the mix does crust. Delivery was prompt and the driver managed to place the bulk bags in an ideal position for me. I have bought other Caledonian bulk products and have always been pleased. Many thanks.

  63. Anne Hetherington (verified owner)

    I think Kelpie compost is great stuff, I have used it before and I will use it again. The delivery driver was very helpful and was able to put the large bag in a convenient position on the drive.

  64. Anne Hetherington (verified owner)

    I think Kelpie compost is great stuff, I have used it before in my garden and I will use it again. I gave my neighbour some and he said it was much better than the product he had been using. The delivery driver was very helpful and was able to put the large bag in a convenient position on the drive.

  65. Kate Kasprowicz (verified owner)

    Excellent compost, my plants love it and my new garden is thriving.

  66. Nicola (verified owner)

    The order process with Caledonian Horticulture is straightforward and the compost was delivered when they said it would. The compost itself is dark and rich and lovely to work with.

  67. Mrs Jan Shirley (verified owner)

    Lovely compost. I’ve used it to mulch my garden this winter and its well worth it. Great service from placing the order to receiving delivery. What’s not to like, and I think my plants will like it too!

  68. Jgeorge (verified owner)

    Brilliant stuff. I’ll buy it again. Fast delivery and reusable bag.

  69. Helen McPhee (verified owner)

    Great product delivered to our community garden promptly

  70. David FORRESTER (verified owner)

    We are regular users of this compost and it’s really good stuff. The delivery service is first class and the driver took away our empty bags from a previous order.

  71. SIMON HODGE (verified owner)


  72. Susan Lawton

    Excellent compost. Looking forward to a good crop of veg this year. Delivery driver was SO helpful. Would definitely recommend shopping with this company.

  73. Karen Watt (verified owner)

    excellent quality compost – will definitely buy again

  74. Phil Lucas (verified owner)

    Excellent compost delivered promptly as requested

  75. Liz L

    Fantastic compost, now on my 4th order this year. Delivery folks are very helpful and place things extremely well.

  76. Scott McPhee (verified owner)

    Quality compost. Good price. The company were flexible with delivery dates. Thumbs up.

  77. john derek sinclair (verified owner)

    Bought 2 builders bags of Kelpie Compost. Excellent delivery. Excellent quality. ten out of ten.

  78. Lisa (verified owner)

    Good moisture retention for large containers and potato bags. Great value for money. Lovely peat free multipurpose compost.

  79. Michael Boyle-Ronaldson (verified owner)

    Kelpie I have found over the years produces outstanding results as a top dressing, often doubling the yield on my vegetables & soft fruits that I got previously with all that ‘Double Digging’ nonsense that I have now stopped. Delivery has always been on time with a driver who drops it in a convenient place. With such a low milage footprint it is even better.

  80. Charles Earl (verified owner)

    Kelpie compost really well graded, easily spread and incorporated

  81. Ian Thomson (verified owner)

    Just a great product! Top quality!
    Will order more for next year
    Delivery lead time was long though?

  82. John Gibb (verified owner)

    Top quantity compost.

  83. Anne (verified owner)

    2nd order, fab product, will be back for more. Thank you

  84. Colin (verified owner)

    Great compost I get a builders bag every year, does wonders for the garden, even keeps the weeds at bay, especially good pre winter in November

  85. Janina (verified owner)

    Absolutely amazing compost!
    Compost is fantastic! What more can I say?! This is my second order and I am not disappointed! Delivery driver was so helpful and nice!
    Highly recommended this company and of course compost!

  86. Anne (verified owner)

    4 builder bags of Kelpie have filled my new raised beds and things are now growing.
    Excellent product and service, thankyou.

  87. Anne (verified owner)

    Delighted with the Kelpie compost, thanks.

  88. Tom Marshall (verified owner)

    Excellent compost – delivered just over a week after ordering. Cheerful helpful delivery driver.
    Will be back again.

  89. Malcolm McGregor (verified owner)

    Absolutely delighted with seaweed compost, ordinary compost, top soil and logs. Superb service overall and reasonably priced products. Would highly recommend.

  90. Mick (verified owner)

    Excellent compost lovely stuff easy to use and great service with the delivery.

  91. Sharon Young (verified owner)

    Kelpie compost…excellent product. I have now been using this regularly for 3 years and definite improvement in soil quality over that period.My vegetable garden has also thrived.Easy to order, prompt straightforward delivery and very pleasant people to deal with.Thank you!

  92. Mike Somerville (verified owner)

    First purchase and the compost is of excellent quality.
    Delivery on time and very helpful driver

  93. WARREN IAN BADER (verified owner)

    Superior product, brilliant service

  94. Annie Day (verified owner)

    Just taken delivery – early days but looks good. Service was first class

  95. Peter Barry Symes (verified owner)

    Good product, fast friendly delivery.

  96. Kenneth Mackinnon (verified owner)

    The builder’s bag of Kelpie compost seems to be an excellent product with even consistency throughout. I’m confident that this will be a positive addition to my new raised bed.

  97. David McDonald (verified owner)

    It’s great compost

  98. Dave king (verified owner)

    First impressions is this is avery good product. No large peace’s of wood well rotted down. And great structure. I will wait to see how my vegetables do in it

  99. Arthur (verified owner)

    Looks great easy to work with first time I have tried so will have to wait for the results bur I am confident that they will be good. Will be buying more in the future.

  100. Sheila Watson-Thomson (verified owner)

    My delivery of Kelpie Compost arrived on time and the driver was helpful and polite.
    We have now filled my raised beds with this wonderful product. The quality was great all the way down to the bottom of each bag. Can’t wait to see the flowers and vegetables I’ll grow.

  101. Jimmy Burnett (verified owner)

    Excellent service as always.

  102. Tom Watson (verified owner)

    first rate, and very quick and efficient delivery

  103. Judith Mathers (verified owner)

    Having been disappointed with other composts bought recently I was really pleased to receive well rotted and rich compost from Celedonian Horticulture. The builders bag was also a good price.

  104. ALan Gordon (verified owner)

    Kelpie Compost is the good stuff. Great as a feed mulch in our polytunnel.

  105. Jimmy Young (verified owner)

    Second year of using this excellent Kelpie compost – three builders bags this time and thats two already applied!
    Superb results last year and looking forward to same this year

  106. Linda Laughland (verified owner)

    Never bought before but was recommended by Lauriston Agroecology Farm to put on top of the topsoil I bought from same supplier. Lovely compost and looking forward to seeing my plants grow well. Again, delivery driver was very helpful and put the bags as near to our beds as he could. Top stuff.

  107. Biggar Community Market Garden (verified owner)

    Its hard to comment on the nutritious value of this compost until we see how the various crops grow, but so far so good. But the quality of the finished product is so much better than others we have used, as all the plastics and large twigs etc have been extremely well sifted out, making it a great medium to deal with, and very little additional work once it’s in place, other than occasional weeding. And the staff have always been very helpful, from the sales dept to the delivery driver.

  108. John Gibb (verified owner)

    Great product, excellent delivery timing.

  109. Polly (verified owner)

    Excellent product and service as always

  110. Aleksandra (verified owner)

    Great compost. Obviously used quicker than I expected so I will be ordering another bag soon.
    Highly recommend.

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