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6-8 weeks current supply only lead time
10 year warranty, 60 year life expectancy
8-10 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 1.2W/m²K
Both casement and sliding sash window styles offer a host of benefits, but the right option for your home will depend several factors.
Our sliding sash windows typically grace heritage properties, while our versatile casement designs excel in both traditional and contemporary homes.
Our sliding sash windows operate vertically within their frame requiring no external clearance, while our casement windows open outward to maximize ventilation and views.
Both our casement and vertical sliding sash windows deliver exceptional thermal efficiency, exceeding building regulations with impressive U-values starting from 1.2 W/m²K.
Our casement and sliding sash windows offer extensive customisation options, including thousands of paint finishes and premium hardware selections to perfectly match your home's unique style.
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. These balances can be completely concealed to not detract away from the window’s traditional style.
Our cords and weights 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, our cords and weights are available with an easy-clean facility.
Our timber flush casement windows feature a sash that sits completely level with the outer frame, making this style a great choice for heritage properties.
Our lipped casement window styles are one of our most popular styles, complementing both traditional and period properties alike. These windows are available in two different profiles with either pencil round or ovolo mouldings.
Colour
Each of our casement and sliding sash windows is beautifully factory finished using the most environmentally friendly water-based paints and stains available. We offer a vast range of options, allowing you to select from any RAL Classic, RAL Design, NCS, or BS colour charts, or perfectly match prestigious collections from Farrow & Ball, Earthborn, or Fired Earth. With single or dual colour options, you can create the ideal aesthetic harmony between your window's exterior facade and interior decor.
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
Glazing
Discover the perfect glazing option for your casement or sliding sash windows. Choose from single glazing, SlimLine (narrow cavity) glazing, double glazing, or triple glazing. Add glazing bars to create traditional and contemporary glazing patterns using our applied 16mm, 25mm and 35mm glazing bars.
We also offer acoustic double glazing with a range of impressive sound reduction ratings, from 33dB to 42dB and a variety of obscure glazing patterns are available offering varying privacy levels (rated 1-5 with 5 being the highest level of obscurity). Our obscure, translucent coloured and opaque painted glass also makes for a great feature.
Delta (Level 5)
Kora (Level 4)
Chinchilla (Level 3)
Kocie (Level 4)
Cotswold (Level 5)
Niagara (Level 5)
Frosted (Level 5)
Stippolyte (Level 4)
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.
Our flush and lipped casement windows come with multi-point espagnolette locking systems that are handle operated. You can choose from an exclusive range of four handles and decorative stays in both modern to traditional styles in up to 10 different colours.
Click the link below to view our full range of window ironmongery.
Window IronmongeryPolished Brass
Antique Brass
Polished Chrome
Satin Chrome
Polished Chrome
Antique Brass Bulb End Handle
Bronze Bulb End Handle
Satin Chrome
Polished Brass
Stainless Steel Round Bar Handle
Satin Chrome Window Handle
Bronze
Security
Feeling safe and secure in your home is essential for your peace of mind, that’s why our timber casement and 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
With options for both lipped and flush casement styles, our timber casement windows provide exceptional versatility for any home style.
Their outward-opening design delivers outstanding ventilation and unobstructed views, while creating a superior weather seal when closed. With impressive thermal performance exceeding building regulations, these windows help reduce energy costs.
Each window is completely bespoke, environmentally friendly, and built to last over 60 years with minimal maintenance.
Contact usAll of our products are manufactured using FSC® 100% 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 touchOur double glazed timber windows and doors exceed the new Part L 2023 building regulations and can achieve impressive U-values starting from 1.2 W/m²K – which is 15% better than the guidelines.
Whereas our triple glazed windows and doors achieve U-values starting from 0.8W/m²K which is 43% better than what’s stipulated in the regulations.
Our timber windows are naturally renewable, carbon neutral and made from only sustainably sourced FSC® 100% certified 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.
SustainabilityBoth our casement and sash windows exceed energy efficiency standards. Casement windows typically offer marginally better thermal performance due to their compression seal mechanism, but both styles provide excellent insulation with our high-performance glazing options.
Sliding sash windows are typically associated with Georgian, Victorian and Edwardian properties as they offer a traditional look. While casement windows are often used in modern properties, flush casement windows are historically accurate for many cottage and farmhouse styles. Our heritage designs can be tailored to match the specific style of your home.
They are a completely different opening mechanisms for our sliding sash windows. The cords and weights option has wider jambs to hold the lead or steel weight, but there is no difference in the warranty we offer.
Absolutely. Many homeowners choose sliding sash windows for street-facing elevations and casement windows for less visible aspects of the property. Our design team can help create a cohesive look across different window styles.
If your property is listed or in a conservation area, you’ll likely need planning permission to replace your windows. We can provide detailed specifications and drawings to support your planning application and have extensive experience working with conservation officers.
Both window styles are designed for low maintenance with our factory-applied finishes. Sliding sash windows have more moving parts and may require occasional attention to maintain smooth operation, while casement windows have simpler mechanisms.
Order corner samples of popular products including stain, ironmongery and bars delivered straight to your front door.
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Simpson and Partners
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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.
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