---
title: "Caulk — £556K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/diy-tools/caulk"
last_updated: "2026-07-31T07:58:27.238Z"
locale: en
meta:
description: "Niche score 43/100 · £556K/yr market · 468K searches/yr · £6.64 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 43/100 · £556K/yr market · 468K searches/yr · £6.64 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Caulk — £556K/yr Amazon UK Niche (2026) - Flapen"
---
# **caulk**
**Skip it**
Prices mostly outside the sweet spot ($2.11–$14.07) — this niche doesn't clear our bar today.
Market size 62Growth 15Conversion 99Competition 13Returns 99Price range 0Avg price 18Brand share 7Review moat 47Quality gap 57
**Conversion**
**Incredible****17.9%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Incredible****0.2%**
return rate — above 5% kills the launch gate
**Market size**
**Good****£556K**
£556K/yr · 468K searches
**Quality gap**
**Good****4.4★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Okay****1,822.56**
avg incumbent reviews — the moat a new listing must climb
**Avg price**
**Bad****£6.64**
avg listing price — sweet spot $15–$100
**Growth**
**Bad****-20.0%**
90-day search growth — must beat 0% to launch
**Competition**
**Bad****84%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****97%**
top-5 brand share — brand-locked demand
**Price range**
**Bad****£2.11–£14.07**
cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United Kingdom niche tracking, caulk is a £556K/yr Amazon United Kingdom market (468K searches/yr). The top 5 brands hold 97% of demand. Demand peaks in Feb. Verdict: Skip it — 43/100.
Data updated Jul 22, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **caulk market data**
- **Units sold / yr**
- **80K–100K**
- avg 8,000–10,000/product
- **Revenue / yr**
- **£531K–£664K**
- units × avg price
- **Conversion rate**
- **17.9%**
- **Avg BSR**
- **#116**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **67%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **42 months**
- **Avg seller age**
- **172 days**
## **Competition & brand share**
The top 5 products capture 84% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**6 **▼falling
**Sellers**
**57**
**Top-5 brand share**
**97%**
Top 20: 100%
**Top-5 click share**
**84%**
Top 20: 100%
**Open market**
**0%**
- Everbuild46% - Soudal27% - EETU11% - EVO-STIK7% - Sika5% - Siroflex3%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -20.0% search growth over the last 90 days.
12K8KSpike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Feb · busiest ÷ quietest = 1.8×
[**Open Trend **](https://flapen.com/research/uk/diy-tools/caulk/trend)
## **Top caulk search terms**
- **caulk**176K/yr-17.5%13.0% conv. - **decorators caulk white**134K/yr-22.3%15.3% conv. - **decorators caulk**46K/yr-11.4%10.0% conv. - **caulk white**21K/yr-24.4%11.9% conv. - **caulking**15K/yr-21.0%8.7% conv. - **white caulk**10K/yr-18.4%13.6% conv. - **decorators caulk white paintable**8K/yr-31.0%12.5% conv. - **chaulk**6K/yr+0.1%8.7% conv. - **calk sealant**7K/yr-33.8%13.5% conv. - **painters mate**7K/yr-35.5%4.7% conv. [**All search terms **](https://flapen.com/research/uk/diy-tools/caulk/search-terms)
## **Top caulk 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%15%£83K30%£167K45%£250K60%£334K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 9 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Sika Caulk Once Premium Quality Acrylic Caulk Highly Flexible Fast Drying White 295ml**Everbuild**£2.60**4.5★11,812 rev](https://www.amazon.co.uk/dp/B00HUWU1ZU) [2**Pack of 2 Soudal Decorator Caulk Gap & Crack Filler Acrylic Silcone Adhesive Sealant**Soudal**£5.30**4.6★1,007 rev](https://www.amazon.co.uk/dp/B07RDWBL37) [3**EVO-STIK Decorators Caulk White - 280ml - Low-Movement Crack and Gap Filler - Fast-Drying - Can be Overpainted - Easy-to-Apply - Lasts Up To 15 Years**EVO-STIK**£3.33**4.4★56 rev](https://www.amazon.co.uk/dp/B00LXM4VYA) [4**Decorators Caulk White Set - Bundle With Sealant Gun Silicone Tool Smoothing Set And White Caulk Gap And Crack Filler Acrylic Silicone Adhesive Sealant**EETU**£14.07**4.0★164 rev](https://www.amazon.co.uk/dp/B0DGLWV7VL) [5**Soudal Decorators Caulk Acrylic Gap & Crack Filler Silicone Sealant (x6)**Soudal**£9.83**4.7★328 rev](https://www.amazon.co.uk/dp/B07RCDL7K6)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Decorators Caulk White Set - Bundle With Sealant Gun Silicone Tool Smoothing Set And White Caulk Gap And Crack Filler Acrylic Silicone Adhesive Sealant**EETU**£14.07**164 rev1y ago](https://www.amazon.co.uk/dp/B0DGLWV7VL) [**Decorators Caulk White Set with Sealant Gun & Smoothing Tool**EETU**£11.55**74 rev1y ago](https://www.amazon.co.uk/dp/B0DD7X5NCL) [**Pack of 2 Soudal Decorator Caulk Gap & Crack Filler Acrylic Silcone Adhesive Sealant**Soudal**£5.30**1,007 rev7y ago](https://www.amazon.co.uk/dp/B07RDWBL37) [**Pack of 3 Soudal Decorator Caulk Gap & Crack Filler Acrylic Silcone Adhesive Sealant**Soudal**£6.33**1,051 rev7y ago](https://www.amazon.co.uk/dp/B07RDWFX7D) [**Soudal Decorators Caulk Acrylic Gap & Crack Filler Silicone Sealant (x6)**Soudal**£9.83**328 rev7y ago](https://www.amazon.co.uk/dp/B07RCDL7K6)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**EVO-STIK Decorators Caulk White - 280ml - Low-Movement Crack and Gap Filler - Fast-Drying - Can be Overpainted - Easy-to-Apply - Lasts Up To 15 Years**EVO-STIK**£3.33**4.4★**▲ 232%**](https://www.amazon.co.uk/dp/B00LXM4VYA) [**Pack of 3 Soudal Decorator Caulk Gap & Crack Filler Acrylic Silcone Adhesive Sealant**Soudal**£6.33**4.5★**▲ 86%**](https://www.amazon.co.uk/dp/B07RDWFX7D) [**SikaSeal One Hour Caulk (Previously Everflex 125) White 300 ml**Sika**£2.11**4.5★**— 7%**](https://www.amazon.co.uk/dp/B004LB2BEW) [**Sika Caulk Once Premium Quality Acrylic Caulk Highly Flexible Fast Drying White 295ml**Everbuild**£2.60**4.5★**— 4%**](https://www.amazon.co.uk/dp/B00HUWU1ZU) [**Decorators Caulk White Set - Bundle With Sealant Gun Silicone Tool Smoothing Set And White Caulk Gap And Crack Filler Acrylic Silicone Adhesive Sealant**EETU**£14.07**4.0★**— 5%**](https://www.amazon.co.uk/dp/B0DGLWV7VL)
**~~View all trending →~~**
## **What buyers say about caulk**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**23%
*“Good smooth quality”*
**Value For Money**23%
*“Great value”*
**Advertised Vs Actual Product**17%
*“Did the job”*
**Ease Of Use**9%
*“Easy to use”*
**Stitch/Finish/Polish**5%
*“Easy to apply and great finish”*
**Adhesion/Stickiness**4%
*“Did the job that it was intended for, great adhesion”*
**Paint Quality**3%
*“Dries hard and paints over really easily”*
**Moist/Dry**3%
*“Dried quickly”*
**Spray/Flow**2%
*“Flows well”*
**Color**2%
*“Caulk is good standard crisp white in colour”*
### **What buyers complain about **
**Quality-Overall**34%
*“Cheapest i could find excellent quality”*
**Value For Money**10%
*“Overall this is no better than the cheaper alternatives in my opinion”*
**Ease Of Use**9%
*“Hard to use”*
**Defective Material/Parts**7%
*“One of the tubes I bought was faulty”*
**Paint Quality**5%
*“This means it shows as a different texture when painted is therefore clearly visible”*
**Advertised Vs Actual Product**5%
*“Doesnt look like the picture”*
**Leak-Proof**5%
*“bubbly because it leaks out both ends”*
**Strength**4%
*“its very fragile”*
**Functionality-Overall**2%
*“Couldnt even do the job we bought it for”*
**Durability**2%
*“It also cracks very badly after even a few weeks”*
### **Top return reasons **
**Functionality-Overall**14%
**Value For Money**11%
**Defective Material/Parts**10%
**Compatibility-Overall**9%
**Spray/Flow**6%
**Advertised Vs Actual Product**5%
**Color**5%
**Natural Resource Wastage**5%
**Leak-Proof**5%
**Quality-Overall**4%
## **Common questions**
- **Is caulk profitable to sell on Amazon United Kingdom?**
- The niche generates £556K/yr across 9 tracked products. 90-day search growth is -20.0%. Flapen's verdict: Skip it (43/100).
- **How competitive is the caulk niche?**
- 6 brands and 57 sellers compete. The top 5 products take 84% of clicks and top 5 brands hold 97% of demand.
- **What do buyers complain about in caulk?**
- Top complaints mined from reviews: Quality-Overall, Value For Money, Ease Of Use. The return rate is 0.2%.
- **When does demand for caulk peak?**
- Demand peaks in Feb; the busiest month runs 1.8× the quietest.
- **What does it cost to enter the caulk niche?**
- Listings span £2.11–£14.07; the average listing price is £6.64 (sweet spot $15–$100). The average incumbent carries 1,823 reviews — the moat a new listing must climb.
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