The best basement windows, compared.
Top pick: Kathfly 16 x 8 inch recessed basement window Best value: Kathfly 16 x 8 inch recessed basement window – Same 4.4 star line at about £39.10, from 14 ratings, and the lowest captured price in the set. Updated 22.10.2026.
A basement window here is a small aluminium or vinyl sash on amazon.co.uk for basements, sheds, bathrooms and coops. It is not a made-to-measure window from a UK fabricator, and it is not a [roof window](/hub/diy-supplies/roof-window). Separate them by printed size, frame, frosted or clear glass, the screen, and whether the title and the bullets agree on a slider, a hopper or a pivot. For a habitable room in England, Approved Document B wants an unobstructed opening of at least 0.33 m² and at least 450 mm by 450 mm. A 16 by 8 inch frame is about 406 by 203 mm, so one side is already short of 450 mm. The jobs named across the listings are basements, sheds, bathrooms and coops. Seven listings stayed in the set after film, tape and an insulation kit were removed. Both print part number and a stated weight of 3.35 kg. These price bands are the seven captures, not a market survey.
A basement window here is a small aluminium or vinyl sash on amazon.co.uk for basements, sheds, bathrooms and coops.
24 products checked · 58 hrs invested · +17,300 readers
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Personal buying guide
Question 1 of 2
Where will you fit it?
At 16 x 8 inches, the Kathfly provides a compact sliding opening with closed, half-open and fully open positions for a shed or similar outbuilding. Its recessed aluminium frame, clear tempered glass and removable mosquito net make the £39.10 package practical where light and basic ventilation matter. The amazon.co.uk star line is 4.4 from 14, while US reviewers commonly praise straightforward fitting and shed ventilation. One reviewer reports no leaks, but others describe a flimsy frame, bent delivery condition and an unfinished-feeling latch. The required opening is smaller than 14.9 x 7 inches, so careful measurement is essential. It is our best-value option, although its very small size and absent U-value or clear-opening figure rule it out as evidence of suitability for a habitable basement.
Pros
Cons
Best for: Sheds, coops or other non-habitable spaces needing a compact recessed window with a removable screen.
Less suitable: Habitable basements, escape routes or installations requiring documented thermal and clear-opening performance.
Specifications
Common questions
How big is the opening supposed to be?
The listing says the window is about 16 x 8 inches and that the hole should be smaller than 14.9 x 7 inches, because the unit is recessed.
Does the listing include a screen and screws?
Yes. The bullets name a removable mosquito net and a pack of screws. Included components are printed as one basement window.
Are the written reviews from the United Kingdom?
No. The capture's reviews are from the United States. The amazon.co.uk star line is 4.4 from 14.
This 16 x 8 inch CroBlissful uses an insulated vinyl frame, double-layer clear glass and an included screen in a compact package. The amazon.co.uk star line is 4.4 from nine, matching the highest score in the comparison, while US reviewers describe it as well built and praise the screen in bathroom use. The clear glass gives a view where the frosted sister model prioritises privacy. One review warns that there is no interior sill, leaving the unit recessed in a poured-concrete wall. The title and bullets also disagree over whether it is a slider or hopper, so the opening action needs checking. It is our top pick for its materials and positive build comments, but at £96.18 it is relatively expensive and still lacks a U-value or verified clear-opening size.
Pros
Cons
Best for: Small bathrooms, sheds or other non-habitable spaces where clear glass, a vinyl frame and an insect screen are priorities.
Less suitable: Privacy-led installations, flush interior finishes or projects needing verified UK escape-window compliance.
Specifications
Common questions
Is this the clear version of the 16 x 8 inch size?
The title and the colour line say clear glass, and the material bullet says double-layer clear glass in an insulated vinyl frame. It is a different ASIN from the frosted Croblissful unit.
Does the listing include a screen?
Yes. The pack line says one window and one screen. A United States review says the bug screen kept insects outside.
Will it sit flush in a thick concrete wall?
The install bullet says the window will be level with the building. One United States review says there is no interior sill, so in a poured concrete basement wall it sits recessed. The capture does not resolve that.
The 16 x 8 inch Croblissful combines frosted double-layer glass with a compact opening suited to privacy-focused spaces such as bathrooms or coops. Its amazon.co.uk star line is 4.0 from 30, the largest rating count in this comparison, and US reviewers often mention easy fitting. The screen is included, but one reviewer says it is not removable and must be opened before moving the sash. Other reported drawbacks include the small size, corner sealant and exposed metal. The listing also conflicts over whether the mechanism is sliding or hopper-style, so the opening action should be checked before purchase. At £86.64, it suits buyers prioritising privacy over a view, but it has no U-value or clear-opening figure for a habitable basement assessment.
Pros
Cons
Best for: Bathrooms, coops or outbuildings needing a small privacy-glass window with a screen.
Less suitable: Anyone needing a clear view, a removable screen or documented UK escape and thermal performance.
Specifications
Common questions
Is the glass frosted?
Yes. The title says frosted glass, and the material bullet says double-layer frosted glass. A reviewer who wanted a view asked for a clear version.
Does the listing agree on slider or hopper?
No. The title says sliding. The bullets say hopper and also say the sash slides. One United States review describes an outward opening without a crank.
Where were the written reviews posted?
The 16 reviews in the capture are from the United States. The amazon.co.uk star line is 4.0 from 30.
The STARHMLUX is a 58 x 38 cm horizontal vinyl slider with an integrated mesh and lock described in the listing. Its size gives more width than the compact 16 x 8 inch options, but the frame remains only 38 cm high. The evidence is weak: the amazon.co.uk star line is 1.0 from a single rating, and the only written review is from Italy. That reviewer strongly criticises the finish, questions whether the panes are glass and reports a weight of about 2 kg. The listing itself states 454 g and gives conflicting frame depths of 7.6 cm and 1 cm. At £93.40, those unresolved discrepancies make it difficult to recommend unless the seller can confirm the materials, depth and weight before purchase.
Pros
Cons
Best for: Only a carefully checked non-habitable installation where the seller confirms the disputed specifications.
Less suitable: Buyers seeking dependable review evidence, consistent dimensions or a verified basement escape window.
Specifications
Common questions
How does the listing say you should measure?
Measure width at the top, middle, and bottom, and height at the left, middle, and right, then use the smallest figure. The selected size on this page is 58 x 38 cm.
Which frame depth is printed?
Both. A bullet says 2.99 inch (7.6 cm). The dimension line says 58 x 38 x 1 cm. The capture does not say which figure to use.
What does the only review say?
It was written in Italy. It rejects the finish, says the unit looks like a toy, says the panes are not glass, and says it weighs about 2 kg. The spec line says 454 g. The star line is 1.0 from 1.
This 55 x 40 cm aluminium slider offers a larger glazed area than the 16 x 8 inch models and is described as a flush-mount unit. The title names tempered transparent glass, a screen and a lock, while the captured price is £74.00. Its 3.35 kg stated weight suggests a more substantial assembly than the smallest windows in the comparison. However, there is no amazon.co.uk star line or review text to confirm fit, finish or long-term operation. The listing also provides no clear-opening size, despite using the word egress. It is therefore a specification-led option for a measured non-habitable opening, not a product that can be treated as a verified escape window.
Pros
Cons
Best for: A measured shed, garage or utility-space opening where a white flush-mount aluminium slider is wanted.
Less suitable: Buyers who need proven user feedback, verified escape dimensions or documented energy performance.
Specifications
Common questions
What size is this listing?
The title selects white, 55 x 40 cm, also printed as 22 x 16 inch. The dimension line is 55.88 x 40.64 x 0.99 cm and the weight is 3.35 kg.
Is the part number unique to this colour?
No. Part number XZIDKKTKA, the 3.35 kg weight, the rank line, and the date 7 April 2026 are the same as the grey 53 x 50 cm listing B0GWCLMPX7.
Does the page show a star rating?
No star line is in the capture, and there is no review text. Egress appears in the title only. No clear-opening size is printed.
The grey Sion's store slider fills a 53 x 50 cm nominal format and uses an aluminium-alloy frame with tempered glass. Its horizontal sliding action, screen and flush-mount description make it a plausible ventilation window for a garage, shed or utility area. The £75.71 captured price is close to the smaller white version from the same seller. Both listings share part number XZIDKKTKA and a stated weight of 3.35 kg, despite their different dimensions. There is no star line or review text, so build quality and ease of installation remain unverified. The listing also omits glass thickness, U-value and clear-opening size, which prevents the egress wording from establishing compliance.
Pros
Cons
Best for: Non-habitable utility spaces where the measured opening suits a grey 53 x 50 cm horizontal slider.
Less suitable: Escape-window projects or buyers wanting independent evidence about fit, finish and durability.
Specifications
Common questions
What size is selected on this listing?
Grey, 53 x 50 cm, also printed as 21 x 20 inch. The title lists other inch sizes as a range. The dimension line is 53.34 x 50.8 x 0.99 cm.
How does the listing say you fit it?
The install bullet says to set the frame in the opening, tighten the screws, fit the panel, and fill the gap with foam sealant. It does not describe a lintel or a below-ground seal.
Is there a star rating?
No. The capture has no star line and no reviews. The part number XZIDKKTKA is shared with the white 55 x 40 cm listing.
The ZUGIATP is the largest option here at a nominal 24 x 36 inches, with a black aluminium-alloy frame and 5 mm tempered water-ripple glass. Its kit lists mounting screws and sealing foam, and the captured price is £100.00. The textured glass offers privacy while admitting light, making the format potentially useful in a larger utility or outbuilding opening. However, the listing variously calls the action pivot, casement, hopper and double hung, so its real mechanism and clear opening are uncertain. There is no amazon.co.uk star line or review text to test the seller's claims, and no screen is named. The larger frame should not be treated as a compliant escape route without measured clear-opening evidence and professional assessment.
Pros
Cons
Best for: Larger non-habitable openings where textured privacy glass and a black aluminium frame suit the project.
Less suitable: Buyers needing a confirmed opening mechanism, insect screen or verified escape-window performance.
Specifications
Common questions
What mechanism does the listing name?
The title says a 360 degree rotating pivot and also says casement. The bullets say hopper and double hung. Those words are all printed. The capture has no drawing that picks one.
What is in the kit?
The bullet lists a pre-assembled window, mounting screws, and sealing foam. It says to secure the unit from the top and then apply the foam. No screen is named.
Is a custom size included in this price?
The bullet offers a custom size if you send opening dimensions. The captured listing is 24 x 36 inch at £100.00. No star line and no reviews are in the file.
The score on each row is the amazon.co.uk star line times 20, rounded to an integer. A missing star line is 0. That number is not a laboratory score and not a Building Regulations score. U-value and clear opening are absent from every listing, so they are not in the score. The checks below are how the listings were read. When two rows share 88, the clear vinyl unit is the top pick and the lower-priced Kathfly is best value.
Job and printed size
25%A shed, coop or garage can use a small screw-in unit. A room someone sleeps in needs Approved Document B or a protected stair. Nominal size is checked against the hole and against 450 mm. A missing clear opening cannot pass that test.
Mechanism
20%Slider, hopper and pivot are not the same clear opening. Title and bullets that name different actions stay as a conflict. They are not merged into one mechanism.
Glass and screen
20%Frosted double-layer glass, clear glass, tempered glass and water-ripple glass are separated. A screen is counted only when the listing or a review names it, including whether a reviewer says it is removable.
Review evidence
25%The amazon.co.uk star line is quoted with its count. Written reviews are kept in the country where they were posted. United States and Italian text is not treated as British experience.
Price at a similar star line
10%Best value is the lower captured price at the shared 4.4 star line, not a second copy of the top pick. A missing star line does not win on price alone.
Read the hole and the job before the star line. These seven amazon.co.uk listings are small aluminium or vinyl sashes for sheds, bathrooms, coops and similar openings, not made-to-measure fabricator windows. Captured prices run from about £39.10 to £100. None prints a U-value or a clear opening. Written reviews are from the United States or Italy. A habitable basement still needs Approved Document B or a protected stair.
A basement window on this page is a small aluminium or vinyl sash sold on amazon.co.uk. The jobs named across the listings are basements, sheds, bathrooms and coops. It is not a made-to-measure unit from a UK window fabricator. Seven listings stayed in the set after film, tape and an insulation kit were removed. A RISOR 90 by 40 cm uPVC tilt window at £175.10 on diy.com is a different product and is not in this set. The rows fall into three groups.
Nominal size is the frame. Approved Document B cares about the unobstructed opening. None of these listings prints that figure. A 16 by 8 inch frame is about 406 by 203 mm, already short of 450 mm on one side, before a slider reduces it further.
A room someone sleeps in needs an escape window that meets Approved Document B, or a protected stair. The 16 by 8 inch units, the 58 by 38 cm frame and the 55 by 40 cm frame fail a 450 mm side on the frame alone. Egress in a title is not that test.
Written reviews in the captures are from the United States, or from Italy on the STARHMLUX unit. Kit foam is not evidence that a unit meets BS 8102, and the frame is not described as carrying a brick wall. A new or widened opening goes to building control. FENSA does not cover a widened opening.
Start with the job, then the hole. A shed, coop or garage can use a small screw-in unit. A room someone sleeps in needs an escape window that meets Approved Document B, or a protected stair. None of the seven listings prints a clear opening, so none is evidence of that route. Measure three widths and three heights and keep the smallest figure. A 16 by 8 inch unit is about 406 by 203 mm, so one side is already under 450 mm.
Slider, hopper and a 360 degree pivot are not the same clear opening. Two CroBlissful titles say sliding while the bullets say hopper. A reviewer of the clear unit calls it a hopper. The ZUGIATP title says a 360 degree pivot and casement, and the bullets say hopper and double hung. Frosted double-layer glass is the Croblissful unit at about £86.64. Clear glass is the view on the CroBlissful vinyl unit and the Kathfly, which also says tempered.
Three typical situations, each with a recommendation from this comparison.
You want light, screws and a screen in a non-habitable outbuilding. The Kathfly 16 x 8 inch recessed window is best value at about £39.10, with 4.4 from 14 ratings and a removable mosquito net. Reviewers also report a flimsy frame and units that arrived bent. The hole should be smaller than 14.9 x 7 inches.
You want frosted glass more than a view. The Croblissful 16 x 8 inch frosted window is about £86.64, with 4.0 from 30 ratings, the largest count here. United States reviews mention bathrooms and easy fitting. One reviewer says the screen is not removable. The title and the bullets disagree on slider versus hopper.
The hole is bigger than 16 x 8 inches and nobody sleeps in the space. The grey Sion's store slider is a nominal 53 x 50 cm at about £75.71, with tempered glass named and no star line. It shares part number XZIDKKTKA with the white 55 x 40 cm listing. Egress in the title is not a clear-opening measurement.
The top pick is the CroBlissful 16 x 8 inch clear vinyl window at about £96.18. It shares the highest star line in the set, 4.4 from 9 ratings, and the listing states an insulated vinyl frame, double-layer clear glass and a screen. United States reviews call it well built. The title and the bullets disagree on slider versus hopper, and there is no U-value or clear opening. Best value is the Kathfly 16 x 8 inch recessed aluminium window at about £39.10, with 4.4 from 14 ratings and a removable mosquito net. Reviewers also report a flimsy frame and units that arrived bent. Neither listing is evidence of a compliant escape window.
Kathfly 16 x 8 inch recessed basement window
Same 4.4 star line at about £39.10, from 14 ratings, and the lowest captured price in the set.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public UK sources and the amazon.co.uk listings compared on this page. Updated 22.10.2026.
This page contains affiliate links. The amazon.co.uk tag is pcuk26-21. If you buy through these links, we may earn a commission at no extra cost to you. Prices, stars and review counts are the figures already stored for this set. This is not a laboratory test.
