---
title: "Castile Soap — £194K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/beauty/castile-soap"
last_updated: "2026-08-05T22:19:23.167Z"
locale: en
meta:
description: "Niche score 45/100 · £194K/yr market · 187K searches/yr · £12.71 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 45/100 · £194K/yr market · 187K searches/yr · £12.71 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Castile Soap — £194K/yr Amazon UK Niche (2026) - Flapen"
---
# **castile soap**
**Skip it**
Brand-locked demand (top 5 brands take 97% of clicks) — this niche doesn't clear our bar today.
Market size 38Growth 52Conversion 80Competition 16Returns 100Price range 64Avg price 56Brand share 7Review moat 25Quality gap 30
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Great****8.2%**
search→purchase rate — share of searches ending in a sale
**Price range**
**Good****£4.74–£33.20**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Good****£12.71**
avg listing price — sweet spot $15–$100
**Growth**
**Good****+23.2%**
90-day search growth — must beat 0% to launch
**Market size**
**Okay****£194K**
£194K/yr · 187K searches
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Bad****4,610.55**
avg incumbent reviews — the moat a new listing must climb
**Competition**
**Bad****81%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****97%**
top-5 brand share — brand-locked demand
According to Flapen's Amazon United Kingdom niche tracking, castile soap is a £194K/yr Amazon United Kingdom market (187K searches/yr). The top 5 brands hold 97% of demand. Verdict: Skip it — 45/100.
Data updated Jul 18, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **castile soap market data**
- **Units sold / yr**
- **13K–15K**
- avg 1,000–1,250/product
- **Revenue / yr**
- **£159K–£191K**
- units × avg price
- **Conversion rate**
- **8.2%**
- **Avg BSR**
- **#103**
- **Page quality**
- **0%**
- **Prime**
- **82%**
- **Sponsored**
- **27%**
- **Out of stock**
- **5.8%**
- **Avg brand age**
- **52 months**
- **Avg seller age**
- **171 days**
## **Competition & brand share**
The top 5 products capture 81% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**6 **—flat
**Sellers**
**31**
**Top-5 brand share**
**97%**
Top 20: 100%
**Top-5 click share**
**81%**
Top 20: 100%
**Open market**
**0%**
- The Soapery53% - freshskin beauty ltd28% - Naissance7% - Dr. Bronner's6% - Suezbana3% - Kirk's3% - Open — no brand owns it (0%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +23.2% search growth over the last 90 days.
6K4KHoliday '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.5×
[**Open Trend **](https://flapen.com/research/uk/beauty/castile-soap/trend)
## **Top castile soap search terms**
- **castile soap**78K/yr+91.1%5.6% conv. - **castile liquid soap**53K/yr-29.0%9.5% conv. - **the soapery**19K/yr-32.0%0.7% conv. - **liquid castile soap**7K/yr+38.8%9.0% conv. - **castile soap liquid**7K/yr+62.3%8.3% conv. - **castille soap**7K/yr+31.3%7.4% conv. - **pure castile soap**4K/yr+100.6%2.2% conv. - **castile soap organic**6K/yr-49.1%6.7% conv. - **soapery**5K/yr-18.8%1.0% conv. [**All search terms **](https://flapen.com/research/uk/beauty/castile-soap/search-terms)
## **Top castile soap products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%10%£19K20%£39K30%£58K40%£78K1001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 11 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Castile Liquid Soap Base 1 Litre - Organic SLS SLES Sulphate and Paraben Free**The Soapery**£8.03**4.6★3,588 rev](https://www.amazon.co.uk/dp/B07D8X6GTK) [2**Freshskin Beauty LTD | 1 Litre Organic Liquid Castile Soap (1000ml) - All-Natural Unscented Liquid Soap - Pure SLS SLES Free - Vegan Friendly - 100% Organic**freshskin beauty ltd**£7.98**4.6★484 rev](https://www.amazon.co.uk/dp/B00BG5NW8U) [3**Freshskin Beauty LTD | 100ml Organic Liquid Castile Soap - All-Natural Unscented Liquid Soap - Pure SLS SLES Free - Vegan Friendly - 100% Organic**freshskin beauty ltd**£4.74**4.6★484 rev](https://www.amazon.co.uk/dp/B0BYKCTXJ3) [4**Castile Liquid Soap Base 5 Litre - Organic SLS SLES Sulphate and Paraben Free**The Soapery**£24.01**4.6★3,588 rev](https://www.amazon.co.uk/dp/B07D8VC7DX) [5**Castile Liquid Soap Base 500ml - Organic SLS SLES Sulphate and Paraben Free**The Soapery**£6.63**4.6★3,588 rev](https://www.amazon.co.uk/dp/B07D8Y4ZWQ)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Castile Liquid Soap Base 1 Litre - Organic SLS SLES Sulphate and Paraben Free**The Soapery**£8.03**3,588 rev8y ago](https://www.amazon.co.uk/dp/B07D8X6GTK) [**Castile Liquid Soap Base 5 Litre - Organic SLS SLES Sulphate and Paraben Free**The Soapery**£24.01**3,588 rev8y ago](https://www.amazon.co.uk/dp/B07D8VC7DX) [**Castile Liquid Soap Base 500ml - Organic SLS SLES Sulphate and Paraben Free**The Soapery**£6.63**3,588 rev8y ago](https://www.amazon.co.uk/dp/B07D8Y4ZWQ) [**Naissance Liquid Castile Soap (No. 407) - 5 Litres - Natural Certified Organic Fragrance Free - Vegan SLS and SLES Free**Naissance**£33.20**1,822 rev9y ago](https://www.amazon.co.uk/dp/B01A7111PO) [**Suezbana Liquid Castile Soap Organic 1Kg**Suezbana**£14.74**275 rev10y ago](https://www.amazon.co.uk/dp/B01F2NSPK6)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Kirks Natural Original Castile Soap 113g (Pack of 3)**Kirk's**£8.65**4.5★**▲ 76%**](https://www.amazon.co.uk/dp/B001D4YDKU) [**Freshskin Beauty LTD | 100ml Organic Liquid Castile Soap - All-Natural Unscented Liquid Soap - Pure SLS SLES Free - Vegan Friendly - 100% Organic**freshskin beauty ltd**£4.74**4.6★**▲ 63%**](https://www.amazon.co.uk/dp/B0BYKCTXJ3) [**Freshskin Beauty LTD | 1 Litre Organic Liquid Castile Soap (1000ml) - All-Natural Unscented Liquid Soap - Pure SLS SLES Free - Vegan Friendly - 100% Organic**freshskin beauty ltd**£7.98**4.6★**▲ 20%**](https://www.amazon.co.uk/dp/B00BG5NW8U) [**Castile Liquid Soap Base 500ml - Organic SLS SLES Sulphate and Paraben Free**The Soapery**£6.63**4.6★**▲ 11%**](https://www.amazon.co.uk/dp/B07D8Y4ZWQ) [**Naissance Organic Liquid Castile Soap (no. 407) - 870ml - Natural Vegan Unscented SLS and SLES Free - for Homemade Beauty Hand Wash Dish Soap**Naissance**£12.35**4.6★**— 3%**](https://www.amazon.co.uk/dp/B00MY49QEQ)
**~~View all trending →~~**
## **What buyers say about castile soap**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**28%
*“Excellent soap”*
**Value For Money**18%
*“Money saving”*
**Advertised Vs Actual Product**11%
*“The product works as it is advertise”*
**Ease Of Cleaning**6%
*“Great, ready to make my own cleaning products”*
**Lather**4%
*“has a good lather”*
**Soft Feel**4%
*“Very gentle for hands and body”*
**Toxic/Chemical Free**4%
*“non-toxic home cleaning products”*
**Smell**4%
*“smells great far too nice for my greenhouse”*
**Efficiency**3%
*“Works well for home made cleaning spray”*
**Brightness/Shine/Glow**3%
*“Sparkling”*
### **What buyers complain about **
**Value For Money**17%
*“Do not waste your money”*
**Skin Health**13%
*“My skin hasnt felt so good”*
**Advertised Vs Actual Product**13%
*“I feel like that's silly to advertise that way”*
**Quality-Overall**13%
*“Poor quality and price is high”*
**Hair Related**13%
*“after a few uses i noticed a lot of hair in my hairbrush”*
**Thickness**13%
*“I find it is thicker than the other brand I got from here”*
**Dilute/Watery**4%
*“Watered down and more glycerin than anything else”*
**Oily/Greasy**4%
*“greasy and disgusting”*
**Texture/Consistency-Overall**4%
*“it has a consistency that is very liquidy”*
### **Top return reasons **
**Size-Overall**25%
**Leak-Proof**16%
**Functionality-Overall**13%
**Moist/Dry**9%
**Ingredients-Overall**9%
**Advertised Vs Actual Product**9%
**Quality-Overall**6%
**Color**6%
**Value For Money**6%
## **Common questions**
- **Is castile soap profitable to sell on Amazon United Kingdom?**
- The niche generates £194K/yr across 11 tracked products. 90-day search growth is +23.2%. Flapen's verdict: Skip it (45/100).
- **How competitive is the castile soap niche?**
- 6 brands and 31 sellers compete. The top 5 products take 81% of clicks and top 5 brands hold 97% of demand.
- **What do buyers complain about in castile soap?**
- Top complaints mined from reviews: Value For Money, Skin Health, Advertised Vs Actual Product. The return rate is 0.0%.
- **When does demand for castile soap peak?**
- Demand is steady year-round — the busiest month runs 1.5× the quietest.
- **What does it cost to enter the castile soap niche?**
- Listings span £4.74–£33.20; the average listing price is £12.71 (sweet spot $15–$100). The average incumbent carries 4,611 reviews — the moat a new listing must climb.
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