Frequently Asked Questions

We understand you may still have some questions you’d like help with. Our friendly team are on hand to help by emailing or by calling 0800 0277 454 / 01423 859 323. Alternatively, we’ve pulled together some of the most common questions we get asked, below.

Frequently Asked Questions (faqs)

How much will it cost to renovate my windows?

It depends how much work each windows needs, each project is different and the work we do is bespoke. We recommend asking your local office for a guide price, budget price or survey by calling 0800 0277 454 or completing our online form

Is it possible to install double glazing into my original sash windows?

This depends entirely upon what type of window you have; however, we have developed a service that will more than likely meet your requirements, namely by replacing your existing moving sashes with new, slim double-glazed timber replicas, installed into your original box frame. You can find out more here.

Do you offer a guarantee?

Yes, our work is guaranteed for 5 years.

Will renovation reduce outside noise levels?

Our secondary glazing system and the Ventrolla Perimeter Sealing System (draught proofing) have been independently tested and proven to significantly reduce sound intrusion.  You can find out more here

How long will my window renovation take?

The time taken will vary depending on the result og 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.

Should I replace my existing timber windows with new timber windows?

This is not usually necessary, however if renovation is not a viable option we can supply complete new timber windows that will replicate the originals. Our advice is based entirely on the results of your survey, your personal preference and your budget.

Is there a minimum order value?

Yes we do. We offer a full renovation, draught-proofing or bespoke new joinery service, and we can’t usually help with smaller works than this (broken sash cords, cracked glazing etc.) unless they form part of a larger renovation project. Our minimum order value is £1,500 inclusive of VAT.

How does the Ventrolla Perimeter Sealing system (VPSS) improve comfort levels?

The main window complaints we hear from our customers are draughts, rattles, leaks and heat loss from their windows. Our draught-proofing system closes the gap around the sashes, eliminating these issues whilst allowing the sashes to still travel smoothly past each other.

What kind of wood do you use?

We use a range of timbers – hardwoods like Sapele, softwoods like Redwood and we also use a fast-growing, sustainably sourced’ super wood’ called Accoya®, which has been specifically designed to withstand the worst of the British weather.

Can you help with condensation problems?

The main way you can combat condensation is to further ventilate your home (i.e. open your windows from time to time). The moisture in your home is caused by heating, bodies etc. and it settles on the nearest cold surface, usually your windows. Double glazing units will be slightly less cold and therefore you may notice slightly less condensation, however, your home will also be better insulated, thus more moisture may be contained within your home.

Are your installers all Ventrolla employees and/or Ventrolla trained?

Yes, all of our staff are Ventrolla trained employees and audited to our specification. However, we’re soon launching our Ventrolla Training Academy, which may mean we use fully-trained external Ventrolla representatives to carry out your works, however, rest assured, they will have undertaken our strict training programme, including quality control measures managed by our in-house team.

Which areas in the UK do you cover?

At present we operate throughout the UK, excluding Isle Of Man, Northern Ireland and Channel Islands. You can find out a more up to date list of where we cover by calling our team on 0800 0277 454 or emailing

Can I buy your product from you and do the work myself?

No, sorry, at present we are a ‘supply and fit’ only service. All of our products are unique to us and guaranteed, therefore they need to be fitted by Ventrolla-approved Installers.

Do you only renovate sash windows?

We specialise in sash windows but we also manufacture new casement windows, doors, Yorkshire sliders, French windows, French doors etc. – basically, anything timber!

How long will the survey take?

It depends on the number of windows you would like us to survey and how long your chat with our surveyor takes, however, we usually say between 40 minutes to an hour.

Do I need scaffolding?

Where possible, we do all work in situ and take the sashes out from the inside of the property. Because of this, we ask that the rooms we will be working in are cleared of any obstructing furniture, we will cover any remaining furniture with dust sheets. If scaffolding is necessary, for the safety of our team, yourselves and passers-by, we will discuss this with you in advance.

What is the process if I want to arrange a survey?

You can get in touch on 0800 0277 454, email us at, or complete our enquiry formOur usual lead time to process an enquiry is 2 working days from submission. However, during these unprecedented times and the latest COVID measures we must advise that our lead time could be up to 10 working days. We assure you that we value every customer that comes to us.

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

Yes. We do a lot of work on Listed properties and those within conservation areas, or Areas Of Outstanding Natural Beauty (AONB), and we work closely with local conservation and planning officers, English Heritage, Historic England, Historic Scotland and Cadw.

Can you paint my windows?

Unfortunately, for our renovation services, painting is not a service we currently offer – our Installers are trained Joiners and Carpenters and not professional Painters. However, we will always prime any exposed wood to protect it from the elements for the short time whilst you organise a painter and decorator. We also provide a detailed step by step guide on how to paint your sash window, following your works.

What is the lead time for getting my work done?

It varies from area to area depending on how busy we are and what window work you require, the lead time normally varies from 6-14 weeks from date of order. Your Surveyor will be able to advise you better on current lead times and our operations team will be able to confirm exact timescales once you place your order. Please note that, these unprecedented times and the latest COVID measures we must advise that our lead time could be longer. We assure you that we will keep you updated throughout the process, should there be any impact to your installation date.

If you’re not able to find the answer to your question, or you’d like further information, please do not hesitate to get in touch with us and we’ll be happy to help.