With so much choice, sometimes choosing your new windows can be a little dauting. Let us help you make an informed decision by answering some of your key questions.
What's the difference between flush and casement windows?

Firstly, a casement is the moving part of a window – the bit that opens and closes.  Standard (or ‘lipped’) windows feature casements that sit proud of the surrounding window frame.

The increasingly popular flush casement window features casements that sit completely level with the frame for a neater, more understated look.  The difference is clear to see if you compare the two windows side by side – why not pop into one of our showrooms to see the difference for yourself?

Oak Envisage Flush Windows
Should I choose Double Glazed or Triple Glazed Windows?

The obvious difference between double and triple glazing is the panes of glass within the unit – double glazed has two and triple, as you would expect, has three.  There are pros and cons to be considered with both options, and we’d recommend speaking to a Pennine advisor to determine which is the most suitable option for you.

Typically though, triple glazing is better at retaining the internal heat in your home and preventing cold spots.  With the correct combination of gaps and glass thickness, it can also to some degree help with noise reduction, although if you live on a busy road there are other potential solutions that you should also explore.

One thing to bear in mind is that the cost difference between double and triple glazing is significant – so it’s definitely worth talking it through with our team who can help you determine the right windows for you.

Windows Guarantee


Our friendly advisors are always happy to answer any questions you may have. You will find answers to some of the most common questions they receive below.

What is the difference between PVC Windows, PVCu Windows & UPVC Windows?

There is no difference whatsoever and to be absolutely correct it is PVC-U and neither of the above!

In the UK UPVC changed it’s name to PVCU in the late 1980’s to fall in line with other European countries. It seems that they were all calling it call it PVC-U because European languages mostly place the noun (being PVC in this case) before the adjective (U).

The ‘PVC’ part of it stands for Poly Vinyl Chloride. The ‘U’ stands for Un-plasticised. Poly Vinyl Chloride, which we know as every day ‘PVC’ is modified and can then be used in the manufacture of products such as bags, shoes and also fake leather. It is the use of this material which has made us familiar with the abbreviation ‘PVC’.

Pure PVC-U is not quite suitable for replacement windows and doors. A small amount of additives are required, necessary to provide longevity, high weather and UV resistance, and also to achieve a white colour making it ideal to use for the production of windows and doors.

What colours do your replacement windows and doors come in?

Gone are the days when all windows had to be white!  Our replacement windows and doors come in a huge range of colours and finishes to suit your style.

If white or cream floats your boat, then great.  But if modern and stylish is your thing, then greys, greens and blacks such as Anthracite Grey. Hazy Grey, Matt Black and Olive Grey are really on trend.

We also have beautiful collection of wood grains, such as the rich, dark elegance of Rosewood or the brighter oak effect colours, along with smooth finishes and standout, statement colours including Chartwell Green, Dark Red and Steel Blue.

All of our windows are also available in colour combinations, so you can have the outside in one colour, and the inside another, if you wish.

I hear a lot about energy rated windows! What does 'A' rated windows mean?

Window Energy Ratings (WERs) use a consumer-friendly traffic light style to help you determine how energy efficient your window will be. Think of it as similar to the energy ratings you find on white goods in your home such as fridges, freezers, washing machines etc – using a scale of A+ – G.

A+ rated windows are the most energy efficient windows available in the UK as defined by the BFRC Rating Scheme. This is the UK’s national system for rating the energy efficiency of windows and is recognised within the Building Regulations as a method to show compliance for your replacement window installation.

Look out for windows that carry A or A+ rating so you can be sure they will keep your home comfortably warm and energy efficient.

All new or replacement windows require a minimum WER of C or above. Ask your Pennine advisor for further details and they’ll be only too happy to help.

What does U-Value mean?

A U-Value, in simple terms, indicates how well your window will be at retaining the internal heat within your home and preventing it from escaping to the outside. U-Values are measure in Watts per square metre, or W/m2 K. The lower the U-Value number, the better the heat retention of the window.

All new or replacement windows require a minimum U Value of 1.6 W/m2 K. Ask your Pennine advisor for further details and they’ll be only too happy to help.

What does Secured by Design mean?

Secured by Design (SBD) is the official police security initiative that works to improve the security of buildings and their immediate surroundings to provide safe places to live.

SBD’s product-based accreditation scheme – the Police Preferred Specification – provides a recognised standard for all security products that can deter and reduce crime. This includes domestic windows and doors, and the components within them such as locks, hinges etc.

Our sister manufacturing company, Conservatory Outlet (part of the Conservatory Outlet Group) is a registered member of Secured by Design and many of our products have been tested to meet the demands of the standard. Please ask your Pennine advisor for details if security is a particular concern for you.

Do you make your own windows?

Yes, Pennine is part of the Conservatory Outlet Group of companies, and its sister company Conservatory Outlet is one of the leading manufacturers of UPVC and aluminium windows in the UK. All of our windows are manufactured in the UK at Conservatory Outlet’s state-of-the-art manufacturing facility in Wakefield, West Yorkshire.

Having such a close relationship with our manufacturer means we retain close control over our supply chain – ensuring the exceptional, quality of our innovative product range is maintained at all times.

Is Pennine a member of FENSA?

Yes, Pennine are members of FENSA (Fenestration Self-Assessment Scheme). FENSA has been set up by the Glass and Glazing Federation (GGF) and other industry bodies with Government encouragement in response to the current Building Regulations for England and Wales.

When having windows and doors replaced homeowners must comply with current thermal performance standards and ensure that they get a certificate of compliance from FENSA or from Local Authority Building Control.

FENSA also enables companies that install replacement windows and doors to self certify compliance under these Building Regulations.

How much will it cost me to replace my windows and doors?

Every home is different – so it’s difficult to estimate the cost of replacing your windows & doors without spending some time with us first.

All our windows and doors are tailor-made specifically for your home taking into account your openings and fittings.  And with so many style, colour and performance options to choose from, we really do need to spend some time with you and measure up before we can give you an accurate idea of how much it will cost.

The best place to start is to request a free design consultation, which can take place either in your home, or if you’re more comfortable, you can request an online appointment which can take place via Zoom.

Simply pop your details onto one of our contact forms and we’ll arrange a time and date to suit you ‘Appointment Booking Form‘.

How long will an appointment with your designer take?

We usually advise at least 1 hour for an initial appointment.  This will give our Pennine designer the opportunity to understand your requirements, take down all the measurements and to discuss the various window and door options available to you.

How long will it take to install my new windows and doors?

It really is difficult to say, as every job is different.  It very much depends on how many new windows & doors we’re installing and the complexity of the job.  As a rule of thumb though, a full house of windows can take around 3-4 days to install.  Please speak to a Pennine advisor for an accurate estimate of your project and delivery timescales.

Do you offer finance to help me pay for windows and doors?

Yes. To make life easy for you, Pennine can arrange a variety of affordable and convenient easy payment finance options (subject to application & status). Applying for finance is simple and we promise you a quick decision. Everything can be sorted out with you in the comfort of your home or at your local Pennine Showroom, so you can enjoy whatever you’ve set your heart on right away.

What do we need to do when our finance is approved?

If you’re arranging your own finance, you’ll need to call us as soon as you get the go ahead. If you’re taking up one of our offers, the company will tell us both directly, so there’s no need to call as we will get in touch with you.

What happens if finance is refused?

Finance companies can turn down people for lots of reasons, for example if you’ve moved several times over the past few years. In these circumstances, we always do our best to help and sometimes it’s worth trying another provider, especially if they know you.

I’ve applied for finance with Pennine. How long will approval take?

Sometimes our finance company will say ‘yes’ almost immediately and on other occasions it may take them a few days. This short delay can be for any number of reasons and you should not be unduly concerned.


Every promise we make, we keep. Every time. Our promises are bold and are there to assure you that we’re completely confident in our products and our service.

Free Annual Maintenance Checks

A little wear and tear is part of everyday life so, every 12 months, for the first two years, we’ll keep a comforting eye on you and your Pennine product.

24 Hour Emergency Lockout Service

If the locks on your Pennine door ever fail, just give us a call. We’ll come and let you in anytime, day or night, and fix the fault.

20 Year Guarantee

Pennine is proud to be the North East’s very first to offer a 20 Year Guarantee. Not only that, you will also be covered for both moving and non-moving parts. Our confidence in our products and dedication to our customers means we’ll be there for you well into the future.

Price Promise

Giving our customers complete confidence in the price that they pay is very important to us. So, if you, or any customer, can find the same product specification and service commitment cheaper elsewhere, within 14 days, we’ll refund DOUBLE the difference.


See how affordable your home improvement can be with our Finance Calculator.
  • BUY NOW PAY MONTHLY Spread the cost of your home improvements over 60, 120 or 180 months*
  • BUY NOW PAY 2023 This option allows you a 12 month payment holiday from the date of completion.
Spread the cost over 5, 10 or 15 years...
60 monthly payments
Representative APR
120 monthly payments
Representative APR
180 monthly payments
Representative APR
This finance option allows you the convenience and flexibility of spreading the cost of your home improvements over 60, 120 or 180 months*. You must make the minimum repayment each month. However you can also make additional payments and therefore control the length of the loan and the amount of interest you would pay. No security is required on these loans. These calculators are for illustrative purposes only and do not constitute a credit quotation. *180 months finance only available for orders over £7,500.

Representative Example

Cash Price
20% Deposit
Total Amount of Credit
Duration of Agreement
60 Months
Rate of Interest
4.3% p.a. fixed
Representative APR
7.9% APR
60 Monthly Payments
Total Amount Payable
Pay within 12 months + £29 exit fee
Want to pay in monthly instalments after 12 months rather than one-off payment? Consider this option.
120 monthly payments
Representative APR over 10 years
This option allows you a 12 month payment holiday from the date of completion. Pay 10% deposit when you order, and as long as you pay the outstanding balance in full before 12 months has elapsed plus a £29 settlement fee, no interest will be charged. If, after 12 months, this is not convenient, you can pay in 120 monthly installments at 11.9% APR Representative. *Deferred for 12 months from the date of completion – £29 settlement fee applies if the loan is repaid in full during the deferral period and NO INTEREST will be paid. For legal reasons the Representative Example shows interest IF the outstanding balance is NOT paid before the 12 months has elapsed. No security is required on this loan. These calculators are for illustrative purposes only and do not constitute a credit quotation.

Representative Example

Cash Price
20% Deposit
Total Amount of Credit
Duration of Agreement
132 Months*
Rate of Interest
7.8% p.a. fixed
Representative APR
11.9% APR
120 Monthly Payments
Total Amount Payable
Settlement Fee


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Want to speak with an Advisor? Give us a call on 0800 22 55 22

Our friendly team will be pleased to help with any questions you may have.