---
title: "Window Envelopes — £58K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/business-industry-science/window-envelopes"
last_updated: "2026-07-31T12:50:18.660Z"
locale: en
meta:
description: "Niche score 38/100 · £58K/yr market · 30K searches/yr · £8.46 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 38/100 · £58K/yr market · 30K searches/yr · £8.46 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Window Envelopes — £58K/yr Amazon UK Niche (2026) - Flapen"
---
# **window envelopes**
**Skip it**
Brand-locked demand (top 5 brands take 99% of clicks) — this niche doesn't clear our bar today.
Market size 14Growth 18Conversion 100Competition 16Returns 99Price range 26Avg price 24Brand share 4Review moat 76Quality gap 38
**Conversion**
**Incredible****22.8%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Incredible****0.2%**
return rate — above 5% kills the launch gate
**Review moat**
**Great****482.45**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Price range**
**Okay****£2.60–£19.45**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Bad****£8.46**
avg listing price — sweet spot $15–$100
**Growth**
**Bad****-13.4%**
90-day search growth — must beat 0% to launch
**Competition**
**Bad****81%**
top-5 click share — a locked-up shelf
**Market size**
**Bad****£58K**
£58K/yr · 30K searches
**Brand share**
**Bad****99%**
top-5 brand share — brand-locked demand
According to Flapen's Amazon United Kingdom niche tracking, window envelopes is a £58K/yr Amazon United Kingdom market (30K searches/yr). The top 5 brands hold 99% of demand. Verdict: Skip it — 38/100.
Data updated Jul 21, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **window envelopes market data**
- **Units sold / yr**
- **8K–10K**
- avg 500–750/product
- **Revenue / yr**
- **£68K–£85K**
- units × avg price
- **Conversion rate**
- **22.8%**
- **Avg BSR**
- **#39**
- **Page quality**
- **0%**
- **Prime**
- **73%**
- **Sponsored**
- **100%**
- **Out of stock**
- **8.3%**
- **Avg brand age**
- **72 months**
- **Avg seller age**
- **197 days**
## **Competition & brand share**
The top 5 products capture 81% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**6 **▲rising
**Sellers**
**15**
**Top-5 brand share**
**99%**
Top 20: 100%
**Top-5 click share**
**81%**
Top 20: 100%
**Open market**
**0%**
- Blake57% - Postmaster17% - Triplast15% - RFE6% - Globe Packaging3% - MA NASIR1% - Open — no brand owns it (0%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -13.4% search growth over the last 90 days.
700500Spike '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.3×
[**Open Trend **](https://flapen.com/research/uk/business-industry-science/window-envelopes/trend)
## **Top window envelopes search terms**
- **window envelopes**11K/yr-16.9%24.2% conv. - **window envelopes self seal**8K/yr-8.0%25.4% conv. - **envelopes with windows**5K/yr-11.9%18.9% conv. - **dl window envelopes self seal 1000**3K/yr+5.3%21.4% conv. - **dl window envelopes**4K/yr-28.4%22.1% conv. [**All search terms **](https://flapen.com/research/uk/business-industry-science/window-envelopes/search-terms)
## **Top window envelopes 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%£6K20%£12K30%£17K40%£23K1101001K10K 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**Blake Purely Everyday DL 110 x 220 mm 80gsm Self Seal Window Envelopes (FL2884/500) White - Pack of 500**Blake**£11.62**4.5★915 rev](https://www.amazon.co.uk/dp/B07ZJKSC23) [2**Blake Purely Everyday DL 110 x 220 mm 90 gsm Window Self Seal Wallet Envelopes (13884/50 PR) White - Pack of 50**Blake**£3.10**4.6★461 rev](https://www.amazon.co.uk/dp/B01EYOT1I4) [3**Postmaster DL Window Envelopes 110 x 220mm 80 GSM Self Seal White 1000 Pack**Postmaster**£17.04**4.6★314 rev](https://www.amazon.co.uk/dp/B0BWZMC4SY) [4**Triplast 250 x DL Window Self Seal Security Envelopes (Size: 110x220mm) | Address Window Self Sealing & Printer Safe Mailing Paper Envelopes | Ideal for Everyday Home Office & Commercial Use**Triplast**£8.64**4.6★581 rev](https://www.amazon.co.uk/dp/B0B3S8W2R4) [5**RFE Pack of 100 - DL White Mailing Envelopes with Window Self Seal for Posting mailing Home Office Ecommerce and Business 80gsm 110 x 220mm**RFE**£8.31**4.7★8 rev](https://www.amazon.co.uk/dp/B0DTS2KYZ9)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**DL White Window Envelopes Self Seal 110x220mm 100Gsm Peel and Seal Invoice Letter Envelopes with Clear Window Pack of 30**MA NASIR**£3.03**5 rev5mo ago](https://www.amazon.co.uk/dp/B0GN43YLC7) [**RFE Pack of 100 - DL White Mailing Envelopes with Window Self Seal for Posting mailing Home Office Ecommerce and Business 80gsm 110 x 220mm**RFE**£8.31**8 rev1y ago](https://www.amazon.co.uk/dp/B0DTS2KYZ9) [**Postmaster DL Window Envelopes 110 x 220mm 80 GSM Self Seal White 1000 Pack**Postmaster**£17.04**314 rev3y ago](https://www.amazon.co.uk/dp/B0BWZMC4SY) [**Triplast 250 x DL Window Self Seal Security Envelopes (Size: 110x220mm) | Address Window Self Sealing & Printer Safe Mailing Paper Envelopes | Ideal for Everyday Home Office & Commercial Use**Triplast**£8.64**581 rev4y ago](https://www.amazon.co.uk/dp/B0B3S8W2R4) [**Triplast 100 x DL Window Self Seal Security Envelopes (Size: 110x220mm) | Address Window Self Sealing & Printer Safe Mailing Paper Envelopes | Ideal for Everyday Home Office & Commercial Use**Triplast**£5.51**581 rev4y ago](https://www.amazon.co.uk/dp/B0B3S8S8GH)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**DL White Window Envelopes Self Seal 110x220mm 100Gsm Peel and Seal Invoice Letter Envelopes with Clear Window Pack of 30**MA NASIR**£3.03**3.8★**▲ 83%**](https://www.amazon.co.uk/dp/B0GN43YLC7) [**GP Globe Packaging 50 x DL White Window Self Seal Paper Envelopes (Size: 220x110mm) - Printer Safe & Fully Opaque - Security Mailing Envelopes for Home Office & Business Use**Globe Packaging**£5.15**4.6★**▲ 51%**](https://www.amazon.co.uk/dp/B0D6RRS9YB) [**Blake Purely Everyday C5 229 x 162 mm 90 gsm Self Seal Window Pocket Envelopes (13084/25 PR) White - Pack of 25**Blake**£2.60**4.5★**▲ 33%**](https://www.amazon.co.uk/dp/B00LY25COW) [**Blake Purely Everyday DL 110 x 220 mm 90 gsm Window Self Seal Wallet Envelopes (13884/50 PR) White - Pack of 50**Blake**£3.10**4.6★**▲ 23%**](https://www.amazon.co.uk/dp/B01EYOT1I4) [**RFE Pack of 100 - DL White Mailing Envelopes with Window Self Seal for Posting mailing Home Office Ecommerce and Business 80gsm 110 x 220mm**RFE**£8.31**4.7★**▲ 14%**](https://www.amazon.co.uk/dp/B0DTS2KYZ9)
**~~View all trending →~~**
## **What buyers say about window envelopes**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Advertised Vs Actual Product**44%
*“Good product, What's advertized is what you get”*
**Quality-Overall**38%
*“Great product - as described”*
**Size-Overall**10%
*“Fit for purpose”*
### **What buyers complain about **
**Value For Money**33%
*“struggle with quantity and price”*
**Adhesion/Stickiness**17%
*“adhesive is poor”*
**Quality-Overall**17%
*“Poor quality all round”*
**Paper Quality**11%
*“the paper was a little thinner than expected”*
**Thickness**11%
*“could be a bit thicker”*
### **Top return reasons **
**Quality-Overall**23%
**Size-Overall**20%
**Adhesion/Stickiness**20%
**Paper Quality**10%
**Value For Money**8%
**Leak-Proof**5%
**Ethical Trade/Fair Trade**5%
**Wrinkles**5%
**Strength**5%
## **Common questions**
- **Is window envelopes profitable to sell on Amazon United Kingdom?**
- The niche generates £58K/yr across 11 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -13.4%. Flapen's verdict: Skip it (38/100).
- **How competitive is the window envelopes niche?**
- 6 brands and 15 sellers compete. The top 5 products take 81% of clicks and top 5 brands hold 99% of demand.
- **What do buyers complain about in window envelopes?**
- Top complaints mined from reviews: Value For Money, Adhesion/Stickiness, Quality-Overall. The return rate is 0.2%.
- **When does demand for window envelopes peak?**
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- **What does it cost to enter the window envelopes niche?**
- Listings span £2.60–£19.45; the average listing price is £8.46 (sweet spot $15–$100). The average incumbent carries 482 reviews — the moat a new listing must climb.
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