FENSA

Glass & Glazing Federation Insurance

Mr Nic Donaldson

We are following all Government guidelines while working throughout the Covid-19 pandemic. We are wearing masks, regularly hand sanitizing and social distancing to protect our customers and ourselves.Welcome to Definition Double Glazing Ltd. We are a family-run local business with over 15 years expertise in the double-glazing sector, and we&#39;re proud to have built an excellent local reputation through providing a personal, tailored service with no sales people - something larger glazing firms are often unable to match. We&#39;re proud to offer, supply and fit only the very best products on the market, enabling us to bring our customers home improvement visions into reality. Each Definition customer becomes a valued part of our business. We will work with you to assist you in every stage of your home improvement journey - from your initial home design visit, right through to installation. We offer a wide variety of home improvement services, including:<ul><li>uPVC, Timber, Aluminium windows</li><li>Wide variety of styles including Flush Sash, French, Casement, Tilt &amp; Turn, etc.</li><li>uPVC, Timber, Composite, French, Stable doors </li><li>Bi-folding &amp; Sliding Doors</li><li>Double &amp; Triple specialist glazing available</li><li>Roof lanterns &amp; Skylights</li><li>Conservatories &amp; Orangeries</li><li>Porch conversions</li><li>Glass replacement </li><li>Repairs &amp; Maintenance </li><li>Specialists in Home Renovation/Modernisation</li></ul> What can you expect from choosing Definition to complete your upcoming home improvements? We&#39;re proud to offer a very personal service - so your home improvement project will be personally managed by our Founder and Installation Director, Nic. Nic hold over 15 years experience in the double-glazing sector, having spent a large portion of his career working in senior positions spanning across product, survey and installation within large national glazing firms. Nic &amp; the team will work with you to help you choose the right products for your home based on your style requirements, design plans, energy needs and budget.Our customers are able to choose from a vast &amp; renowned product range from leading manufacturers such as Rehau, SMART Aluminium, Liniar, Veka, Solidor, Distinction &amp; many more. We&#39;re specialists in understanding exactly what it is that you want to achieve - whether you&#39;re working on a significant home modernisation project, a new secure front door, or simply new energy-efficient glazing to freshen up the home - we&#39;ve got it covered. Definition Double Glazing promises every one of our customers:<ul><li>An initial home design visit to discuss your requirements</li><li>Unlimited advice - you can always reach us at any time </li><li>No sales people. Just a small, family-run team of passionate glazing professionals</li><li>Fair price guarantee - we will price match any like-for-like quotation</li><li>10 year insurance-backed product and installation guarantee  </li></ul> Please contact us with any enquiry - big or small, and we&#39;ll be very happy to help you.

Completed Renovation Project 2023

Aluminium Windows & Bifold Doors…

Contemporary Projects 2021/2022

2 x sets of aluminium SMART bi-folding doors, along with several anthracite grey uPVC windows, a juliette balcony, and a glass balustrade to create the ultimate contemporary look

Home renovation - Katy & Darren, Rowtown

Rosewood double glazing 

New uPVC foiled rosewood double glazing & composite door

New uPVC windows & French door bay combination 

Bay windows & new composite door combination 

Rear renovation - bi-folding doors, balustrades & Juliette balcony with windows

Whole house Rowtown, new double glazing, bi-folding doors & front door 

We installed these stylish bi-folding doors to our customers kitchen/living area, completed with sky-lanterns in the roof to allow the natural light to flood into the kitchen space and creating a super-modern finish.

Home renovation - interior with bifolds

This is the completed home renovation that we undertook for our customer in Addlestone. The property underwent full rendering in a white finish, a new grey-slate roof, along with anthracite grey windows and bi-folding doors to achieve this contemporary finish.

After - home renovation 

A photo of our customers home before our renovation began

Before - home renovation

Jon & Natalia - Virginia Water, completion

Jon & Natalia - Virginia Water - BEFORE INSTALLATION

New flush casement uPVC Windows to entire property along with a bespoke designed Solidor combination 

After - Mr Cauilo, Hersham 

We installed brand new uPVC flush casement windows to the entire property and a bespoke designed Solidor front door combination

After - Mr Cauilo, Hersham

Before we installed brand new energy efficient flush casement windows to this property it was in serious need of new glazing and other external renovation

Before - Mr Cauilo 

Mr & Mrs Steward - Gable installation 

During this significant home extension we supplied and installed this beautiful bespoke Gable window, along with 2 sets of aluminium bi-folding doors and several windows. 

Mr WillWards - Maidenhead 

This 4 bedroom 60’s property has been converted into an impressive detached 5-bedroom contemporary family home. We installed anthracite grey REHAU windows to the entire property, along with a stylish composite front door combination & a set of SMART Aluminium bi-folding doors to the rear. We can’t wait to see the finished result with the cladding & rendering - this home is going to be a true transformation when it’s complete!

After: Mr Collingwood - Guildford 

Progress from during the home renovations at Collingwood 

During: Mr Collingwood -Guildford 

The property prior to any extension or renovation - the transformation is huge when looking back on this old photo of the house prior to any works.

Before: Mr Collingwood - Guildford 

Mr Chris Dean - After Installation

Mr Chris Dean - BEFORE INSTALLATION

3-part, anthracite grey aluminium bi-folding doors 

Anthracite grey uPVC windows

Anthracite grey uPVC balcony french doors

Grey anthracite uPVC windows

Anthracite grey uPVC window combination

Anthracite grey french doors and window combination

We renovated this customers entire home from front to back, with brand new AA+ rated energy efficient uPVC windows with georgian bars, and a contemporary anthracite grey composite front door with 3-glass panel. Our customer wanted a very particular style - which was to maintain a traditional, classic look to the home but with an added modern twist - which we helped them achieve perfectly.

Full home renovation

French doors - white uPVC

Brand new uPVC sash windows

Rosewood bay windows uPVC

uPVC sash windows 

Renovation wit 5-part bifolding doors and floor to ceiling glass upper level 

House renovation

2 part bi-folding doors and floor length windows

2-part bi-folding doors

5-part bi-folding doors

3 part bi-folding doors anthracite

Full house renovation 

Renovated this commercial property with new aluminium extra-durable windows throughout with toughened glass.

Commercial renovation to bar

Composite front door in black with classic 2-glass panel, chrome furniture, and new uPVC white windows to the entire property

Whole house renovation

4-part bifolding doors to patio

Bi-folding doors, french doors and new uPVC windows throughout

Rear house renovation

New uPVC windows with white internal georgian bars

Front of house renovation

Bi-folding doors anthracite grey

Composite front door in black with brand new uPVC windows throughout entire property

3-part bifolding doors anthracite grey

Home renovations

Definition Double Glazing

4-part aluminium Cortizo slim bi-folding doors

Bi-folding doors & Lanterns on home extension - Guildford

5-leaf SMART range bi-folding doors premium

White Aluminium bi-folding doors 

White Aluminum bi-folding doors

White aluminium bi-folding doors internal view

4-leaf Anthracite CORTIZO Bi-folding Doors

Anthracite Grey CORTIZO Bi-folding doors

7-leaf Bi-Folding Doors 

2 sets of 3-leaf bi-folding doors with full length fixed pane 

2 sets of bi-folding doors and full length fixed glass pane 

7 Leaf bi-folding doors 

3 leaf bi-folding doors 

Patio sliding doors white uPVC

Full home modernisation including 2 sets of anthracite bi-folding doors

5 part anthracite bi-folding doors

White bi-folding doors

5-part bi-folding doors with upper gable 

4-leaf bi-folding doors

3-leaf bi-folding doors 

Bi-folding/Sliding doors

Flush Casement internal - smooth white uPVC

Windows & Glazing

Chartwell Green classic diamond contemporary door

we fitted this ultra-modern front door combination from the Virtuoso range. Our customer opted for SMART: Architectural Aluminium sidelights to match the SMART windows we installed, with satin glass & brushed stainless steel furniture, finished in smooth Anthracite Grey. ?? The Virtuoso range offer leading thermo technology, enhanced security features and a robust construction with a full 10 year guarantee.

After: Mrs Kim Fry, Staines 

Supplied and installed a new uPVC glass porch combination and undertook all plastering and painting to the porch area

After - Mrs Heather Barkwill, Hersham

After: Mr Cauilo - Hersham

After we supplied and installed this beautiful bespoke Solidor composite door porch combination 

After: Mr Cauilo, Hersham

Before we installed our Solidor bespoke combination this front door was in good need of replacement 

Before: Mr Cauilo, Hersham

Supply and installation of this stunning Distinction hand-painted Anthracite Grey contemporary composite door

After: Mrs Bouchet - Newhaw

Anthracite Grey door featuring a stylish brushed chrome long-bar handle and low letter plate. This door was designed using our door designer - meaning our customer has chosen every last detail for a truly bespoke entrance.  We also installed a modern flat sky light with self-clean tinted UV glass to provide some bright natural light at the rear of the property.

After: Mrs Bouchet, Newhaw

Before we installed our customers new composite door 

Before: Mrs Buchet, Newhaw

New composite front door installed from the Xtreme door range offering maximum security. We also added bespoke features for our customer including a brass hare knocker and other bespoke features. 

After: Mrs Hemingway - Walton

After: Mrs Hemingway, Walton

Before we installed a new Xtreme Victorian door 

Before: Mrs Hemingway - Walton

New double glazing and composite front door installed 

After: Mr Alan Bates 

After: Mr Alan Bates, Essex 

New composite door and double glazing installed on this home in Essex 

After: Mr Alan Bates - Essex

We supplied and installed this rear entrance window & door with a smooth white window combination and white wood grain composite door.

After: Mr Hallmark

Supply and installation of new uPVC and glass porch combination

After: Mrs Barkwill, Hersham

After we supplied and installed this new composite door and flag window combination in Addlestone 

After: Mrs Withers, Addlestone

This uPVC existing door was in need of replacement

Before: Mrs Withers, Addlestone

After we supplied and installed this new composite door in Gold Oak effect with matching frames and cills complete with gold furniture 

After: Mr Campbell, Ascot

This existing old oak door was in need of a replacement due to rot and draught 

Before: Mr Campbell, Ascot 

Jon & Natalia - Virginia Water, Azure Blue Front Door combination

Mrs Jade Griffiths - new traditional victorian door

York composite door combination with composite side panel

Anthracite grey 3-panel composite door 

Before new front door installation

Before - full porch renovation

During - full porch renovation

We undertook this full porch renovation for our customer. This consisted of removing the old porch combination and replacing with a new navy-blue composite front door with classic gold furniture, and new boxed floor-length uPVC sidelights with A+ rated, frosted diamond glass.

Completed full porch renovation

Before front door replacement

We installed a white uPVC front door with gold furniture with a white uPVC side-window finished with frosted glass, for extra privacy.

Completed front door & sidelight installation

This front door combination was rotting and extremely un-secure. Our customer needed a new, modern entrance to their home which guaranteed top-rated security, so we offered one of our most popular and highest-rated security door ranges on the market which was installed successfully.

Before - front door combination replacement

During - front door combination replacement

The installation was complete with a new anthracite grey front door combination with a full-length frosted glass sidelight. This particular front door offers a multi-point locking mechanism for maximum security.

After - front door combination replacement

Interior view - after front door installation

This front door was rotten, didn't lock properly and was extremely unsafe for our customers home. We recommended a high-security front door range complete with a 10 year guarantee to ensure that this customer had all the security reassurances they needed.

This new front door offered our customer the security they needed, finished with stylish chrome furniture.

Completed front door installation

Before front door installation

We installed a classic composite door in a navy-blue finish, with diamond patterned glass to our customers home.

Front door installation completed

Our customer wanted a modern entrance to their home, and also wanted a door which allowed some natural light into their hallway. We installed an anthracite grey composite door with chrome furniture, featuring 2 glass panels and finished with a long bar handle.

Anthracite grey front door completed

Interior view - completed front door

This front door was rotten and unsafe, so we offered our customer several different ideas and options to improve their home security, increase energy efficiency, and give them the look and style that they desired for the front entrance of their new home.

Our customer opted for this midnight blue from our economy door range - and this came at 30% below their budgeted cost for their new front door.

Midnight blue composite front door installed

Our customers door was missing a handle and needed a facelift. The customer wanted an improved visual appearance to the front of their home too.

Before new front door was installed

Anthracite grey 4-panel composite door

uPVC Front door combination with 2-panel sidelight

Black composite front door with sidelight

Composite front door with side windows

Composite front door on porch - black

New uPVC windows and black composite front door

New composite front door from our luxury range with long bar handle & full length sidelight, anthracite grey bay window to front of property and 5-part bifolding doors to rear. New fascias and window boards throughout property.

Rosewood uPVC composite front door with half-sidelights to each side, and brand new uPVC rosewood windows throughout with diamond led glass.

Roosewood windows & doors

Composite front door with twin side windows

Composite Doors & Porches

Keiran has been working alongside Nic on all of our Definition installations for many years and has mastered the skill of perfection when it comes to glazing, trimming and sealing windows and doors. Keiran  assists Nic on all of our installations, and is responsible for preparing the area, helping to remove any existing products, disposing of them and preparing the new products for install. Keiran is fully NVQ Level 1 qualified and has been working in the glazing trade for over 6 years. 

Kieran Smith - Installation Assistant 

Meet our Founder & Director, Nic.  Nic has over 15 years experience in the double-glazing sector, working in many senior positions within national glazing firms before founding Definition Double Glazing Ltd. Nic has a genuine passion for home renovations and upgrades, and takes great pride in helping our customers to achieve their home improvement goals. Nic is a fully FENSA registered installer and surveyor, and possesses all NVQ Level 3 qualifications.

Nic Donaldson - Founder/Company Director

The Team

Completed projects 2025/26

Definition Double Glazing Limited

The process from purchasing the front door to installation was great and with very experienced and professional team!

Front door

The team were great from start to finish 
Competetive on price
Flexible on dates to accomodate our needs 
proffessional and efficient instalation 
Would definately reccomend

Window Instalation

From first being recommended Definition Windows to meeting Nic,  the quote was very competitive, booked a survey and then a date for 4 Windows installation. The guys turned up right on time ,protected all internal furnishings and fitted the windows in a day .
Nic and his team are a perfect match ,you definitely won't be disappointed if you choose Definition Windows as your number 1 window  company 
Massive thanks to Nic and his team for a professional service from start to finish.

Brilliant service from start to finish

Definition doors made everything simple and straight forward in what was already a stressful situation with residents and the management company. Nic was willing to answer any questions, provide munlitiple options and quotes. The fitters that came in the day were professional, clean and took away the old door. I wouldn’t hesitate to use them again or recommend them.

New Front Door

Definition doors were extremely friendly and helpful.   My installation took place on the day and time it was booked and the fitters did an amazing job with no mess or fuss.  I would recommend them to any of my friends.

Very pleased with the service

From start to finish, an absolute first class job was done by Nick and his team, over the moon with our bay windows, 100% recommended Definition double glazing....

Super professional team

Average score based on 19 reviews in the last 12 months

Services offered by Definition Double Glazing Limited, working as Windows / Doors / Conservatories

Definition Double Glazing Limited | Windows / Doors / Conservatories | Chertsey | Checkatrade

We are following all Government guidelines while working throughout the Covid-19 pandemic. We are wearing masks, regularly hand sanitizing and social distancing to protect our customers and ourselves.Welcome to Definition Double Glazing Ltd. We are a family-run local business with over 15 years expertise in the double-glazing sector, and we&#39;re proud to have built an excellent local reputation through providing a personal, tailored service with no sales people - something larger glazing firms are often unable to match. We&#39;re proud to offer, supply and fit only the very best products on the market, enabling us to bring our customers home improvement visions into reality. Each Definition customer becomes a valued part of our business. We will work with you to assist you in every stage of your home improvement journey - from your initial home design visit, right through to installation. We offer a wide variety of home improvement services, including:uPVC, Timber, Aluminium windowsWide variety of styles including Flush Sash, French, Casement, Tilt &amp; Turn, etc.uPVC, Timber, Composite, French, Stable doors Bi-folding &amp; Sliding DoorsDouble &amp; Triple specialist glazing availableRoof lanterns &amp; SkylightsConservatories &amp; OrangeriesPorch conversionsGlass replacement Repairs &amp; Maintenance Specialists in Home Renovation/Modernisation What can you expect from choosing Definition to complete your upcoming home improvements? We&#39;re proud to offer a very personal service - so your home improvement project will be personally managed by our Founder and Installation Director, Nic. Nic hold over 15 years experience in the double-glazing sector, having spent a large portion of his career working in senior positions spanning across product, survey and installation within large national glazing firms. Nic &amp; the team will work with you to help you choose the right products for your home based on your style requirements, design plans, energy needs and budget.Our customers are able to choose from a vast &amp; renowned product range from leading manufacturers such as Rehau, SMART Aluminium, Liniar, Veka, Solidor, Distinction &amp; many more. We&#39;re specialists in understanding exactly what it is that you want to achieve - whether you&#39;re working on a significant home modernisation project, a new secure front door, or simply new energy-efficient glazing to freshen up the home - we&#39;ve got it covered. Definition Double Glazing promises every one of our customers:An initial home design visit to discuss your requirementsUnlimited advice - you can always reach us at any time No sales people. Just a small, family-run team of passionate glazing professionalsFair price guarantee - we will price match any like-for-like quotation10 year insurance-backed product and installation guarantee   Please contact us with any enquiry - big or small, and we&#39;ll be very happy to help you. 

We are a friendly, professional family-run business with over 15 years expertise. We&rsquo;re proud to offer a personal, tailored service - something larger glazing firms are often unable

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