Best basement window
Updated: 23 October 2026
You want the best basement window from a short amazon.co.uk list, and the star lines pull in a different direction from the price and from the glass. Products Compared editorial team kept seven listings, from £39.10 to £100, checked on 22 October 2026. There is no Which? winner and no UK laboratory test in this folder. Best here means which row matches a named job, and which row you should leave. The table is the main [Basement window](/hub/diy-supplies/basement-window) comparison. A qualifying purchase through tag pcuk26-21 can earn a commission at no extra cost to you.
You want the best basement window from a short amazon.co.uk list, and the star lines pull in a different direction from the price and from the glass.
You want the best basement window from a short amazon.co.uk list, and the star lines pull in a different direction from the price and from the glass. Products Compared editorial team kept seven listings, from £39.10 to £100, checked on 22 October 2026. There is no Which? winner and no UK laboratory test in this folder. Best here means which row matches a named job, and which row you should leave. The table is the main Basement window comparison. A qualifying purchase through tag pcuk26-21 can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Glass | Screen | Star line | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Kathfly Kathfly 16 x 8 inch recessed basement window | Tempered, clear | Removable mosquito net | 4.4 from 14 | 8.8 | about £39.10 | View offer |
 CroBlissful CroBlissful 16 x 8 inch clear vinyl window | Double-layer clear | Included | 4.4 from 9 | 8.8 | about £96.18 | View offer | |
| Alternative |  Croblissful Croblissful 16 x 8 inch frosted window | Double-layer frosted | Not removable | 4.0 from 30 | 8.0 | about £86.64 | View offer |
On this page
What this folder can rank
Four listings have an amazon.co.uk star line. The frosted 16 by 8 inch window is 4.0 from 30, the largest count. The Kathfly unit is 4.4 from 14 at £39.10. The clear vinyl window is 4.4 from 9 at £96.18. A white vinyl slider is 1.0 from 1 at £93.40. Two Sion's store sliders and a black pivot window have no star line. A blank is not a quiet five stars.
Stars are the shop's rating, not a building-regulations score. No page prints a U-value or a clear opening. A 16 by 8 inch frame is about 406 mm by 203 mm, so it is not an escape window. This page only ranks inside the seven rows we kept. The tests are on the basement window buying guide.
Croblissful frosted, 16 by 8 inches
The largest review sample is the frosted Croblissful window, ASIN B0DLK8G5FD, at £86.64 with 4.0 from 30. The glass bullet says double-layer frosted glass. Look at it when you want privacy in a bathroom, a shower, or a coop, and you do not need a view. United States comments mention an easy fit, and also corner sealant, bare metal, and a screen that is not removable. One comment says you open the screen to move the sash. The title says sliding and the bullets say hopper. A reviewer describes an outward opening with no crank.
Skip it if you need to see out, a screen you can lift off, or a habitable basement. The clear vinyl sister, ASIN B0FJ1KLX4B, is £96.18 with 4.4 from 9, double-layer clear glass in an insulated vinyl frame. One review says there is no interior sill, so in a poured concrete wall it sat recessed.
Kathfly at £39.10
The Kathfly window, ASIN B0FM83BZR7, is the lower price, not a second winner. It is £39.10 with 4.4 from 14. The listing says 16 by 8 inch, clear tempered glass, a removable mosquito net, and screws, and the hole should be smaller than 14.9 by 7 inches because the unit is recessed. Stated weight is 1.03 kg. A reviewer describes a single pane. The listing does not say double glazing. United States comments praise shed vents, and others call it flimsy, bent on arrival, and very small.
That bent-in-the-box note is why the low price is not a free pass. Take it for a shed vent when you will cut to that printed hole and you can accept a single pane. Leave it when you wanted frosted privacy glass or a heavier vinyl frame.
Rows with thin evidence
Sion's store sells a white slider at £74.00, ASIN B0GWC9B9KW, sized 55 by 40 cm, and a grey slider at £75.71, ASIN B0GWCLMPX7, sized 53 by 50 cm. Both print part number XZIDKKTKA and 3.35 kg, and neither has a star line or a review. The titles name a screen and the word egress. No clear opening is printed, so the larger frame is not an escape pass.
The STARHMLUX vinyl slider, ASIN B0H2F2PCJB, is £93.40 at 58 by 38 cm, with 1.0 from an Italian review that disputes the glass and says 2 kg against a spec line of 454 g. The ZUGIATP window, ASIN B0H7X1WZ83, is £100, a 24 by 36 inch title, with water-ripple glass, no reviews, and no screen. The page says pivot, casement, hopper, and double hung.
Common questions
Which is the lowest price with a screen?
The Kathfly unit at £39.10 names a removable mosquito net and a pack of screws. The frosted and clear 16 by 8 inch windows also include a screen, at £86.64 and £96.18. The Sion titles name a screen, at £74.00 and £75.71, but those pages have no reviews. Lowest price with a screen, in this folder, is the Kathfly row, with the bent-on-arrival complaint attached.
Why is there no star line on the Sion's store rows?
The capture for the white 55 by 40 cm listing and the grey 53 by 50 cm listing has no star line and no review text. They share part number XZIDKKTKA, the same stated weight of 3.35 kg, and the same first-available date. Absence of stars is not a hidden high rating. You would be buying the printed size and the word egress, without a fitter's comment to read.
Should I skip the £93.40 vinyl slider?
Yes, unless you have a reason this file does not contain. The star line is 1.0 from 1, the review is from Italy, and it disputes the glass and the weight. The page also prints two frame depths, 7.6 cm and 1 cm. A 38 cm height is already under an escape minimum, which is a separate failure. There is no second UK review to balance that one.
Are any of these escape windows?
No listing prints a clear opening, and the 16 by 8 inch frames fail a 450 mm side before they are opened. Egress in a Sion title does not change that. The 24 by 36 inch title is not a pass either, because the unobstructed gap is not printed. Use basement escape window size if someone sleeps in the room.
What can best mean without a lab?
It can mean the largest review sample for a privacy vent, or the lowest price for a removable screen, with the complaints left in view. It cannot mean the safest, the warmest, or the only legal escape window. We did not test these units. The amazon.co.uk star line is the rating, and the United States comments are not UK proof.
Related pages
Sources
Public UK sources and the amazon.co.uk listings compared on this page. Updated 22.10.2026.
- Approved Document B Volume 1, paragraphs 2.10 and 2.16 (retrieved 22.10.2026)
- Approved Document L Volume 1, Table 4.2 (retrieved 22.10.2026)
- Approved Document K, critical glazing locations (retrieved 22.10.2026)
- Approved Document F Volume 1, paragraphs 3.14 to 3.15 (retrieved 22.10.2026)
- FENSA: jobs you can register (retrieved 22.10.2026)
- Planning Portal: basements and building regulations (retrieved 22.10.2026)
- BS 8102:2022, protection of below-ground structures against water (retrieved 22.10.2026)
- Hampshire building control: replacement windows and doors (retrieved 22.10.2026)
- diy.com RISOR 90 by 40 cm tilt window, not in this set (retrieved 22.10.2026)