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Top 10 Best window sills

Best window sills in 2026

window sills

Selecting the right window sills are essential for both protecting your window frames and providing a functional surface for your interior design. Whether you are looking for a low-maintenance uPVC option or the traditional warmth of pine timber, the choice depends on your budget and the desired aesthetic. Our selection focuses on durability, ease of installation, and the ability to withstand daily wear and tear in UK homes.

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9-57€

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Interactive Comparison

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🥇 40/100

Window Sill Capping Board - Square Edge...

8.95GBP

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🥈 40/100

150mm White UPVC Window Board/Cill Cover...

13.10GBP

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🥉 40/100

White UPVC Window Board/Cill Cover 1.25m...

13.50GBP

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#4 40/100

225mm White UPVC Window Board/Cill Cover...

22.95GBP

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#5 40/100

225mm White UPVC Window Board/Cill Cover...

17.75GBP

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#6 40/100

Bullnose Capping Cover 9mm Thick Plastic...

29.95GBP

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#7 40/100

White PVC Bullnose Window Board Cover 1....

18.00GBP

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#8 40/100

Pine Window Board Sill Top Grade 21mm x...

56.50GBP

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#9 40/100

300mm White UPVC Window Board/Cill Cover...

18.95GBP

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#10 40/100

200mm White UPVC Window Board/Cill Cover...

17.95GBP

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Rank	🥇 #1	🥈 #2	🥉 #3	#4 #4	#5 #5	#6 #6	#7 #7	#8 #8	#9 #9	#10 #10
Product
Name	Window Sill Capping Board - Square Edge Window Boa...	150mm White UPVC Window Board/Cill Cover 1.25m Lon...	White UPVC Window Board/Cill Cover 1.25m Long 9mm...	225mm White UPVC Window Board/Cill Cover 2.5m Long...	225mm White UPVC Window Board/Cill Cover 1.25m Lon...	Bullnose Capping Cover 9mm Thick Plastic Internal...	White PVC Bullnose Window Board Cover 1.25m Long w...	Pine Window Board Sill Top Grade 21mm x 219mm x 1....	300mm White UPVC Window Board/Cill Cover 1.25m Lon...	200mm White UPVC Window Board/Cill Cover 1.25m Lon...
Price	8.95 GBP	13.10 GBP	13.50 GBP	22.95 GBP	17.75 GBP	29.95 GBP	18.00 GBP	56.50 GBP	18.95 GBP	17.95 GBP
Topelio Score	40/100	40/100	40/100	40/100	40/100	40/100	40/100	40/100	40/100	40/100
Filters	NEW	NEW	NEW	NEW	NEW	NEW	NEW	NEW	-5% NEW	NEW
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Rank	Window Sill Capping Board - Square...	150mm White UPVC Window Board/Cill...	White UPVC Window Board/Cill Cover...	225mm White UPVC Window Board/Cill...	225mm White UPVC Window Board/Cill...	Bullnose Capping Cover 9mm Thick Pl...	White PVC Bullnose Window Board Cov...	Pine Window Board Sill Top Grade 21...	300mm White UPVC Window Board/Cill...	200mm White UPVC Window Board/Cill...
Product
Price	8.95 GBP	13.10 GBP	13.50 GBP	22.95 GBP	17.75 GBP	29.95 GBP	18.00 GBP	56.50 GBP	18.95 GBP	17.95 GBP
Topelio Score	40/100	40/100	40/100	40/100	40/100	40/100	40/100	40/100	40/100	40/100
Filters	NEW	NEW	NEW	NEW	NEW	NEW	NEW	NEW	-5% NEW	NEW
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Our Quick Picks

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Best Overall

Window Sill Capping Board - Square Edge Window Boa...

8.95GBP

Price Range -

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Best Choice

Virtual Plastics - Window Sill Capping Board - Square Edge Window Board Sill Cover - Plastic Window Cill Cover - 150mm (W) x 1 Metre (L) x 9mm (T)

Best Choice

NEW

Virtual Plastics B0D234ZMG8

Window Sill Capping Board - Square Edge Window Board Sill Cover - Plastic Window Cill Cove...

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40/100

Our Window Sill Cover board can be used to cap over existing window sills to avoid the need for a complete replacement
The window board profile wraps around the existing lip of the internal sill to completely cover it providing a neat finish

£8.95

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Eurocell - 150mm White UPVC Window Board/Cill Cover 1.25m Long 9mm Thick Plastic Window Sill Capping

Top Pick

NEW

Eurocell B077SYJZNH

150mm White UPVC Window Board/Cill Cover 1.25m Long 9mm Thick Plastic Window Sill Capping

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40/100

Quick and easy fitting � minimal tools required and no mechanical fixings
Long lasting protection � tough, colour-safe and resistant to warping

£13.10

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Generic - White UPVC Window Board/Cill Cover 1.25m Long 9mm Thick Including End Cap Plastic Window Sill Capping (150mm Depth)

Top Pick

NEW

Generic B0DNJXC979

White UPVC Window Board/Cill Cover 1.25m Long 9mm Thick Including End Cap Plastic Window S...

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40/100

Quick and easy fitting - minimal tools required and no mechanical fixings
Long lasting protection - tough, colour-safe and resistant to warping

£13.50

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Eurocell - 225mm White UPVC Window Board/Cill Cover 2.5m Long 9mm Thick Plastic Window Sill Capping

NEW

Eurocell B078C6JDTD

225mm White UPVC Window Board/Cill Cover 2.5m Long 9mm Thick Plastic Window Sill Capping

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40/100

Quick and easy fitting � minimal tools required and no mechanical fixings
Long lasting protection � tough, colour-safe and resistant to warping

£22.95

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Eurocell - 225mm White UPVC Window Board/Cill Cover 1.25m Long 9mm Thick Plastic Window Sill Capping

NEW

Eurocell B077T4DCTZ

225mm White UPVC Window Board/Cill Cover 1.25m Long 9mm Thick Plastic Window Sill Capping

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40/100

Quick and easy fitting � minimal tools required and no mechanical fixings
Long lasting protection � tough, colour-safe and resistant to warping

£17.75

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Eurocell - Bullnose Capping Cover 9mm Thick Plastic Internal Window Sill Trim (2.5) - 240mm, White

NEW

Eurocell B07M6LCN41

Bullnose Capping Cover 9mm Thick Plastic Internal Window Sill Trim (2.5) - 240mm, White

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40/100

Quick and easy fitting – minimal tools required and no mechanical fixings
Long lasting protection – tough, colour-safe and resistant to warping

£29.95

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Generic - White PVC Bullnose Window Board Cover 1.25m Long with End Caps (160mm Depth)

NEW

Generic B0DNKJD323

White PVC Bullnose Window Board Cover 1.25m Long with End Caps (160mm Depth)

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40/100

Quick and easy fitting - simply trim to size and fix in place with adhesive
Long Lasting - No Maintenance - Pre Finished

£18.00

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Atlantic Timber - Pine Window Board Sill Top Grade 21mm x 219mm x 1.8m (9")

NEW

Atlantic Timber B07Z8ZZKLB

Pine Window Board Sill Top Grade 21mm x 219mm x 1.8m (9")

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40/100

Add a touch of class to any room with our top grade unsorted Redwood Pine window board.
These can be used in any room in the house to create a new internal window sill.

£56.50

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Eurocell - 300mm White UPVC Window Board/Cill Cover 1.25m Long 9mm Thick Plastic Window Sill Capping

NEW

-5%

Eurocell B077SYDZDZ

300mm White UPVC Window Board/Cill Cover 1.25m Long 9mm Thick Plastic Window Sill Capping

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40/100

Quick and easy fitting � minimal tools required and no mechanical fixings
Long lasting protection � tough, colour-safe and resistant to warping

£18.95 19.95 GBP

Save 5%

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binoa - 200mm White UPVC Window Board/Cill Cover 1.25m Long 9mm Thick Plastic Window Sill Capping

#10

NEW

binoa B077SYJX4H

200mm White UPVC Window Board/Cill Cover 1.25m Long 9mm Thick Plastic Window Sill Capping

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40/100

£17.95

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Our Expert Verdict: window sills

For most homeowners, uPVC capping is the most practical choice for a quick, low-maintenance refresh. However, timber is the superior choice for those seeking a long-term, high-end architectural finish.

Market Overview: window sills

The market is currently dominated by uPVC capping, which offers a quick, low-maintenance alternative to replacing entire sills, while premium timber remains popular for renovations.

Buying Guide: window sills

When choosing a window sill, prioritise the depth and thickness of the material to ensure a flush fit against your window frame and a stable, flat surface.

Selection Criteria

Products were selected based on material quality, customer feedback regarding installation ease, and overall value for money across different size variations.

Budget Advice

Entry-level uPVC capping is generally the most affordable, while mid-range options include larger boards, and premium timber sills represent the higher end of the price spectrum.

Conclusion: window sills

Finding the perfect balance between cost and durability is key to a refreshing window update. Take a look through our full list of the best window sills to find the option that fits your specific measurements and material preferences.

Frequently Asked Questions

A square edge provides a clean, modern look with a sharp 90-degree angle, while a bullnose edge is rounded, which is often preferred for safety in high-traffic areas and a more traditional appearance.

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