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Transform your home in London with high-quality sash windows

Add a timeless charm to your home with high-quality timber sash windows from Ventrolla. Our sash windows are manufactured in-house using a blend of innovative and traditional joinery techniques to ensure longevity and durability. Our wooden sash windows are a valuable investment for any property as they provide excellent performance without compromising on aesthetics.

Sash Window Features

What makes our timber sash windows unique?

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Patented perimeter sealing system

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Bespoke Georgian, Victorian & Edwardian designs

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Premium timbers, glazing & hardware

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Custom fit to your property with care

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Local expertise, national coverage

Sash windows in White with double glazing

High performance sash windows for properties in London & beyond

Our traditional sash windows are meticulously crafted to suit even the most restricted locations. They come equipped with a range of glazing options, allowing you to choose the one that best suits your needs. Designed with energy efficiency in mind, our sash windows can achieve incredibly low U-values and fantastic window energy ratings. With our timber sash windows, you can enjoy a visually appealing and comfortable home all year round.

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Customisable sash windows for your London home

Find the perfect sash windows for your home by choosing from a range of customisation options including your choice of colour, shape, glazing and hardware options. We offer a classic collection of fittings including quality sash locks, sash lifts, and sash stops which are available in a diverse range of finishes. With so many options available, you’re bound to find the ideal match for your home.

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Brown timber sash window.

What are the benefits of timber sash windows for your London home?

• Available with a range of decorative features including Georgian bars
• Advanced security features, ensuring complete peace of mind
• Listed building, conservation area & AONB compliance
• Huge range of colours and anti-stain primer as standard
• Versatile designs are available
• Minimal maintenance required

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A new Venetian sash window, by Ventrolla

Why choose Ventrolla?

With years of experience in the industry, our team of experts are dedicated to providing homeowners in London and the surrounding areas including Clapham, Surrey, Battersea, Twickenham, and Richmond with quality installations, exceptional customer service, and competitive pricing. For more information on how we can help with your next home improvement project then contact our team for a free quote.

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Our Process



The Ventrolla journey begins with a discussion with a member of our team and/or a detailed home or site design survey, to explore your ideas & devise a bespoke plan of action.



Once our team have finalised the plans, we will provide a comprehensive estimate for your works. Enquiry to estimate typically takes between 5 and 10 working days.



Ventrolla fuse traditional skills with modern technology. If you require new joinery, creating your unique product begins in our UK-based manufacturing facility, and takes between 6 and 10 weeks.



The utmost care is taken to deliver quality products and renovation works that exceed our customers’ expectations. Varying from area to area, Ventrolla lead times depend on how busy we are, and the work required. On average, our installation team will be on site between 6 to 18 weeks from the date your order is placed. We will advise guide installation dates when you place your order.



Our customers come back time and time again – when they move or if they’ve phased their works – all thanks to our exceptional customer service and after care. In the unlikely event that your Ventrolla products require expert attention, we’re always on hand.



Renowned for delivering outstanding quality, all our work comes with a minimum 5-year guarantee (subject to terms), for absolute peace of mind.

  • Sash Window Furniture
  • Energy Efficiency
  • Maintenance
  • Specifications
  • Styles

Sash Window Furniture

Exquisite timber sash window ironmongery hand forged using traditional skills

Compromising on quality simply isn’t an option at Ventrolla, which is why we source our sash window furniture from the very best that the industry has to offer.

Retaining the character of your new sash windows in every aspect, our classic collection of fittings includes quality sash locks, sash lifts, sash stops, D Handles, travel restrictors, tilt knobs, and pole eyes. With a diverse range of finishes, from polished brass sash lifts to antique brass Brighton catches, and chrome plate ring sash eyes to satin nickel sash restrictors, breathing new life back into your heritage home is easy with Ventrolla.

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sash window furniture

Energy Efficiency

Thermally-efficient timber sash windows

Timber is a naturally insulating construction material, offering superior thermal insulation where it’s needed most. Adept at keeping buildings warm and cosy whilst eliminating draughts and rattles for good, combined with efficient double glazing, secondary glazing, or single glazing, you can combat rising fuel bills and improve energy efficiency across the board with a high-performance Ventrolla installation.

Once we receive your final payment, our handy ‘Care Pack’ will be sent to you or your client which includes energy improvement certificates for absolute peace of mind.

brown timber window close up


How do you clean timber sash windows?

Low levels of basic maintenance and cleaning are essential to prolonging the life of new timber sash windows. Requiring a fresh coat of paint every 6-8 years and a quick clean every 6 months, periodic timber window maintenance doesn’t need to be time-consuming.

Once we receive your final payment, our ‘Care Pack’ will be sent to you or your client which includes handy Maintenance Instructions to keep new timber windows looking their best for longer.

opening white sash window


New double glazed timber sash window specifications
• Slim 16mm (4/8/4) double glazed units
• Planitherm Total+ glass (outer pane) and krypton filled cavity
• Centre Pane U-Value of 1.2 Wm²K
• Total Window U-Value of 1.5 Wm²K

Full Ventrolla product listings are available on the RIBA Product Selector and NBC Plus websites and below.

General information:

Colour List

Colour List
  • Bespoke
  • Bespoke
  • Bespoke
Warranty description
  • Five year
  • Pr_30_59_98_96 Wood window units
  • CAWS
L10/10 Wood windows
  • Specification data – Wood window units
    • Dimensions and configurations
      • As drawing. Insert reference.
      • As schedule. Insert reference.
    • Product performance
      • Thermal
        • Whole window U-value
          • 14 mm units: 1.8 Wm²K (1.5 Wm²K centre pane); 16 mm units: 1.5 Wm²K (1.2 Wm²K centre pane).
      • Frame
        • Wood species
          • Hardwood.
        • Finish as delivered
          • Supplied sprayed with a high build base coat Teknos 3130 and an anti-stain primer Teknos Antique White, ready for final finishing coat by others.
      • Glazing or infill
        • Standard
          • BS EN 1279 parts 1-6.
        • Installing replacement Double Glazed sashes into an existing box/frame is outside of Building Control).
        • Requirements
          • 14 mm double glazed units.
            • 4/6/4 units with Argon gas filled cavity, slim Saint Gobain Planitherm Total+ Glass (outer pane) with dual seal edge technology.
          • 16 mm double glazed units.
            • 4/8/4 units with Argon gas filled cavity, slim Saint Gobain Planitherm Total+ Glass (outer pane) with dual seal edge technology.
    • Hardware
      • Insert requirement, supplied with hardware, optional finishes and a range of styles are available.
    • Operation
      • Type
        • Manual.
      • Spacer
        • Black.
        • White.
      • Glazing bar
        • Insert requirement, consult manufacturer’s literature for more information.
      • Ventrolla Perimeter Sealing System (VPSS) location
        • Frame.
        • Sash.
    • Sustainability data
      • Contains Red List materials
        • No
      • Country of material origin
        • Europe
      • Country of product manufacture
        • United Kingdom
      • Embodied carbon
        • 0.5 kg CO₂ eq/kg
      • Recyclability
        • Yes
      • Recycled content
        • 0 %



Timber sash window styles

  • Single Hung
  • Double Hung
  • Sliding
  • Picture
  • Bay

What our customers are saying

Ventrolla were able to beat all the other quotations that I received and answered queries quickly and informatively, making changes as required promptly and without fuss. I was kept informed throughout of lead times and manufacturing times. The real stars of the show were Rob and James who worked tirlessly and brilliantly as a team to repair sash boxes where required and install our new sashes. Thank you!


Everybody I dealt with has been super friendly, informative, and helpful. I received emails with updates on what was happening, etc. It has been a great experience from start to finish.


I used Ventrolla to renovate my sash windows over to years ago. When two of them finally collapsed, including a bay window the size of three full sized Georgian windows they were my first contact. The office staff, surveyors and the three fitters that did an amazing job installing them in less than two days were all excellent. The quality of workmanship and the standard of installation were first class, and the new windows look amazing. I will definitely be using them again as more of my windows will need replacing over the next few years.


This is the second property Ventrolla have restored my windows for me, and the this job was every bit as good as the first. 14 sash windows in a Grade II listed building installed/refurbed without a hitch in week. The team of 4 installers were lovely chaps, super efficient and tidy. All round another fabulous job done – thank you the Ventrolla Team


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Responsibly Sourced Timber Tree heart

Frequently Asked Questions

I live in a listed building / conservation area / AONB - can you work on my property?

Quite simply, yes, we can! We have completed lots of work over the years on listed properties and those within conservation areas and Areas Of Outstanding Natural Beauty (AONB). Working closely with local conservation and planning officers, English Heritage, Historic England, Historic Scotland, and Cadw, you can trust in Ventrolla to reinstate and sustain unique architectural features whilst simultaneously heightening historical value too.

Will new windows cut down on outside noise?

Our secondary glazing system and the Ventrolla Perimeter Sealing System (draught-proofing) have been independently tested and proven to significantly reduce sound intrusion.

Do you offer an installation guarantee?

Yes, our work is guaranteed for 5 years.

What is the average cost of renovating a window?

It all depends on how much work each window needs. For a more accurate estimate, please call us on 0800 0277 454 to arrange a free, no-obligation survey.

How long will my window renovation take?

The time taken will vary depending on the result e.g., your survey and the work we identify is needed. Typically, we work to a one-window-per-day time scale, although this can be adjusted, if necessary, to suit your requirements or our schedule.

Varying from installation to installation, our average timescale targets are

  • Enquiry to quote: 5-10 days
  • Quote to order: 30 days
  • Order to installation: 10-16 weeks

Do sash windows add value to a house?

Sash windows are a traditional feature of many period properties, and their style and design can add to the character and charm of the house. They also offer practical benefits, such as good ventilation and easy access for cleaning.

If your property is a period or heritage home, then having sash windows that are in keeping with the style and age of the property can be an important feature that can add value. The quality of the sash windows themselves will also be a factor. igh-quality, energy-efficient sash windows can enhance the value of the property, especially in areas with high energy prices.

Should I double-glaze my sash windows?

Double glazing sash windows can offer many benefits, such as improving energy efficiency, reducing outside noise, and enhancing the security of your home. Double glazing can help to reduce heat loss and improve energy efficiency, which can result in lower energy bills and a more comfortable home. It can also help to reduce outside noise, which can be particularly beneficial if you live in a busy or noisy area.

Can sash windows be repaired?

Yes, sash windows can be repaired in most cases. Sash window restoration can be a cost-effective solution, especially if the window has historic or architectural value, or if it’s in good condition overall but needs minor repairs.

Some common repairs for sash windows include replacing broken or damaged glass panes, repairing or replacing sash cords, repairing or replacing the sash hardware, repairing or replacing the sash frame, and weatherstripping or draft-proofing.

Depending on the extent of the damage or wear, it may be more cost-effective to repair a sash window rather than replace it entirely. However, if the window is in poor condition or the damage is extensive, replacement may be the better option.

Got questions that haven't been covered? Visit our FAQs or speak to our friendly team today:

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