Call us 01709 838188 or Get in Touch
6-8 weeks current supply only lead time
10 year warranty, 60 year life expectancy
10-12 weeks current supply and installation lead time
Designed by you, made to measure by us
97% of our customers would recommend us
Double glazed whole window U-values as low as 1.3W/m²K
Transform your home with sliding sash windows that honour tradition whilst delivering modern performance. Our triple glazing provides exceptional efficiency without compromising the timeless appeal of authentic sash window design.
Book a consultationOur timber sliding sash windows add real charm and character to any home, helping to replicate traditional designs without compromising on thermal performance.
Achieve outstanding U-values from 0.9 W/m²K, keeping interiors cosy while significantly reducing heating costs.
Recreate classic designs with our full range of sash products including timber only parting beads, baton rods, sash horns and more.
Triple glazing configuration naturally provides excellent acoustic performance, reducing external noise for peaceful, tranquil interiors.
Engineered for a 60+ year lifespan using premium timber and precision manufacturing techniques, our triple glazed sliding sash windows provide decades of reliable performance.
Find the perfect high-quality timber windows and doors for your home renovation, extension or self-build project today.
Discover how our exceptional timber windows and doors can perfectly complement your trade project – whatever it may be.
Spiral Balance is our most popular style of sash window featuring maintenance-free, semi-concealed, in-frame spiral balances. The balances are available in white, brown, black or cream to match your chosen finish, and can be completely concealed to not detract away from the window's traditional style.
Our cords and weights sash windows are the essence of traditional design, featuring lead or steel weights, nylon sash cords with exceptional tensile strength and draught-proof axel pulley wheels. Available with an easy clean facility as well as internal access to the internal and external sash weight pockets, helping to simplify future maintenance.
Styles
Our timber sliding sash windows are available in a variety of styles to suit your property and preferences.
Each style can be customised with your choice of colours, finish and hardware to perfectly complement your home's aesthetic. Whether you're looking for a traditional or contemporary look, our range of styles ensures you'll find the perfect fit for your project.
Book a consultationSingle
A simple, elegant design with one sliding sash.
Single - 33-67
Single with 1/3 over 2/3 sash split.
Double
Two side-by-side sliding sashes.
Double - 33-67
Double with 1/3 over 2/3 sash split.
Triple
Three sliding sashes side-by-side.
Triple - 33-67
Triple with 1/3 over 2/3 sash split.
Colour
Every sliding sash window is beautifully factory finished using the most environmentally friendly water-based paint or stain. Choose from RAL Classic, RAL Design, NCS and BS colour charts or match to Farrow & Ball, Earthborn or Fired Earth colour collections. With single or dual colour options you can create the perfect match to the exterior facade and interior decor of the property.
Paint & Stain FinishesRAL 9016
Linen
Parchment
BS.10.B.15
RAL 9001
Parlour
RAL 1015
BS.10.C.31
BS.10.B.17
RAL 7032
RAL 7030
RAL 6019
French Green
RAL 6021
RAL 6005
London Dust
RAL 5014
RAL 5013
RAL 5022
RAL 3002
RAL 3011
RAL 3005
Smoke
RAL 7035
RAL 7040
RAL 7037
RAL 7015
RAL 7016
RAL 7024
RAL 9005
RAL Colour
Ironmongery
Our timber sash windows come fitted with fitch fasteners, hook lifts and opening restrictors. You can choose from two designs of fitch fasteners known as The Fitch Lock or the Brighton Fastener, three different designs of the opening restrictor and key operated vent lock, the push and twist vent lock or the angel vent lock.
Our cords and weights windows also come with round end pulley wheels as well as optional D handles and ring lifts. With single or dual colour options you can even perfectly match the outside and outside of your property. Click the link below to view our full range of window ironmongery.
Antique Brass
Black
Bronze
Brass
Polished Chrome
Satin Chrome
Rumbled Brass
Rumbled Pewter
Satin Chrome
Satin Nickel
Security
Feeling safe and secure in your home is essential for your peace of mind, that’s why our timber sliding sash windows are Secured by Design accredited, and 3rd Party tested and certified to Part Q.
Secured by Design
PAS 24
ERA Total Security Guarantee
Performance
We’re pleased to share that our products successfully meet industry standards, are fully accredited and have even received certifications related to their security and performance. Check out the complete range of product specifications below.
Secured by Design
Bluesky certified BS644 General Window Performance
BS6180:2011 and BS6399-1:1996 compliant
BlueSky Timber High Performance Window Scheme
FSC® 100% Certified Timber
100% PEFC Certified Timber
BlueSky PAS24:2022 Enhance Security Windows
BlueSky Noise Reducing Windows up to 42dB over all window
UKCA Mark
UW RANGE: 0.8 – 1.4 W/m²K
ACOUSTIC RANGE: 29 – 42dB
G-VALUE RANGE: 0.50 – 0.65
AIR PERMEABILITY: 600 PA (CLASS 4)
WATER TIGHTNESS: 250 PA (CLASS 6A)
WIND LOAD RESISTANCE: 2000 PA (CLASS 5C)
EXPOSURE CATEGORY: 2000 PA
AIR LEAKAGE: 0.8M³ per hour
Our triple glazed sliding sash windows prove that period authenticity and modern efficiency can work in perfect harmony. Starting from 0.9 W/m²K, these windows achieve thermal performance levels 35% better than building regulations, creating significant energy savings without altering the classic appearance that makes sash windows so desirable.
The sophisticated glazing technology provides exceptional insulation whilst preserving every detail of traditional Georgian and Victorian window design.
Get in touchOur triple glazed sliding sash windows prove that heritage authenticity and contemporary performance can coexist beautifully.
Through careful engineering and precision manufacturing, we incorporate advanced triple glazing technology within traditional sash construction, maintaining the exact proportions, glazing bar profiles, and smooth operation that define authentic windows. This perfect marriage of old and new means you never have to choose between period character and modern comfort.
Book a free home consultationAll of our products are manufactured using certified sustainably sourced engineered laminated timber. We offer redwood (Scots Pine) and hardwood (Dark Red Meranti) and both have the same extensive warranty. When comparing the two materials, our hardwood has more of an open grain structure meaning it gives more of a textured finish, particularly when stained.
Get in touchCreate perfectly authentic period windows with our extensive range of features and detailing options. Our timber-only parting beads, staff beads, baton rods, and travel stops to recreate exact historical specifications, whilst deeper bottom sash rails and seven sash horn variations allow precise replication of regional and period-specific designs.
Available glazing bar widths of 16mm, 25mm, and 35mm enable you to recreate any traditional pattern, from classic Georgian multi-pane arrangements to cottage-style horizontal bars and sophisticated marginal glazing configurations.
Book a free virtual consultationOur triple glazed timber windows and doors exceed the new Part L 2023 building regulations and can achieve impressive U-values starting from 0.9 W/m²K – exceeding current guidelines by 35%.
Find out moreOur sliding sash windows are naturally renewable, carbon neutral and made from only certified sustainably sourced softwood or hardwood. The care and attention we give to our timber before and during the manufacturing process ensures a 60 year+ life span, 10-year warranty and low maintenance for life.
SustainabilitySashes slide vertically within the frame. At Bereco we offer cords and weights sliding sash windows, which is a traditional weight and pulley system. We also offer spiral balances which are a tensioned spring mechanism where a coiled spring is discretely concealed inside an encased coloured tube to match the windows finish.
Our triple glazed sliding sash windows achieve exceptional U-values starting from 0.9 W/m²K, which exceeds current building regulations, delivering outstanding energy efficiency whilst maintaining authentic period appearance.
No, our sliding sash windows are specifically designed to accommodate the additional weight of triple glazing whilst maintaining effortless, smooth sash movement that feels authentic to the original design.
At Bereco we don’t offer a tilt facility. This style of window usually comes with unsightly and non-compressing brush seals that can affect weather performance. However, our cords and weights option is available with an easy clean system that allows the bottom sash to open inwards side hung.
Even though we can offer this, both our hardwood and redwood timbers have the same warranty and are engineered from defect-free timber that is preservative-treated and fully factory finished. At Bereco every individual timber element of our windows is treated with preservative using the most technologically advanced coating systems from Teknos, which is why we can offer our 30-year warranty against rot and fungal decay.
No, our triple glazed sliding sash windows are designed to maximise natural light whilst delivering superior thermal insulation. This is the ideal solution for those looking to lower heating bills n period properties while maintaining bright, inviting interiors.
Triple glazed sash windows feature three panes of glass instead of two, creating additional insulating cavities that dramatically improve thermal performance. The extra air gap and pane of glass prevents heat loss, making it easier for your interior to maintain consistent indoor temperatures. This superior insulation reduces energy consumption while also lowering your home’s carbon footprint.
Order corner samples of popular products including stain, ironmongery and bars delivered straight to your front door.
Dave
Zoe
Lee
Nick
Anthony
Jim
Martin
Fiona
Dominic
Paul
Harry
Philip
Jason
Jason
James
Michael
As a dedicated manufacturer of quality timber windows and doors, we are part of a number of specialist memberships and schemes. Check out the full list below.
We’re pleased to announce our brand has featured in several national magazines and publications over the years. Here are some of the most recent places our products have been showcased.
Sign up to our mailing list and be kept up to date with our latest news, promotions and inspiration for your next project.
Design the perfect home with a virtual design consultation.
Come and visit our South Yorkshire showroom; it’s got all the inspiration you need for choosing new bespoke timber windows and doors.
Request a member of our sales team to come to your property to discuss your project in detail.
If you would like one of our team to call you back to discuss your enquiry we’ll be happy to do so.
