Your window and door website loses jobs when it talks about products instead of proof… homeowners spending £3,500 to £15,000+ on new glazing want to see your past work, your credentials and your guarantee before they pick up the phone. Get those three things right on every page and the calls start coming from people who have already decided to hire you.
Last reviewed: June 2026. Revised throughout with current UK pricing, Part L 2022 building regulations, and practical copy guidance for window and door installers.
Most window and door company websites make the same mistake: they list the products and then stop. uPVC, aluminium, composite, triple-glazed… the specs are all there. What’s missing is the thing that actually makes a homeowner pick up the phone: evidence you have done this before, you know what you’re doing, and you’ll stand behind the work when they’ve paid. This post walks through exactly what your site needs to say, and why, so you stop losing jobs to competitors who look more credible online even if the work’s no better than yours.
What homeowners are actually buying when they spend £3,500 on windows
UK residential glazing is not an impulse purchase. A typical three-bedroom semi replacing eight uPVC casement windows pays £3,500 to £5,500 fitted, and upgrading to aluminium or timber pushes the figure higher still (Checkatrade, 2026). For a composite front door, the average installed cost runs £1,200 to £1,800 for a standard unit, rising to £3,500 or more for a premium aluminium door with sidelights (Checkatrade, 2026). These are not figures homeowners spend lightly or quickly.
At that price point, the homeowner is not browsing products. They are auditing you. They want to know your work stands up, your certificates are real, and the guarantee means something. The installer whose website makes that case clearly gets the call. The installer whose site lists frame colours and U-values and nothing else loses it to someone who looks more trustworthy… even if the product is identical.
Your copy job, then, is not to describe what you sell. It is to demonstrate that you are the safe choice.
The three things your website must prove before a homeowner calls
1. Past work that looks like theirs
Before and after photos from real jobs… particularly if they match your target customer’s property type… are worth more than any paragraph of copy. A homeowner in a 1930s semi wants to see what you did to a 1930s semi. Show the original tired frames, the finished install, the clean reveal. Where you can, include the town or area: “New aluminium casements in a period property in York” places you geographically and shows the context. A project gallery with eight to ten real jobs does more conversion work than any headline you write.
2. Credentials a homeowner can check
FENSA or CERTASS registration is not just paperwork… it is the shortcut that lets you self-certify replacement windows and doors as compliant with building regulations, without the homeowner needing a Local Authority inspection or a £200 Building Notice fee. Buyers who have done any research will look for it. Display your registration number prominently on every page where you ask for a call or a quote. If you hold GGF membership or manufacturer-accredited installer status, show those too: they signal that a body has audited your work, not just taken your money.
3. A guarantee with a name behind it
A generic “10-year guarantee” means nothing if the company might not exist in ten years. Tie the guarantee to something concrete: the manufacturer’s product warranty, the DGCOS or GGF deposit protection scheme, and your own workmanship cover. Name the scheme, state the duration, and say exactly what it covers. The homeowner cannot verify that you are good until after the installation; the guarantee is the substitute for that trust. Make it specific and it earns the call. Leave it vague and it disappears into the background.
UK building regulations: what your website should say about compliance
Part L of the Building Regulations (2022) requires all replacement windows in existing dwellings to achieve a whole-window U-value of 1.4 W/m²K or better, or a Window Energy Rating of B or above (Bereco). The same U-value applies to replacement doors that are more than 60% glazed. These rules came into force on 15 June 2022 and apply across England. Scotland and Wales have separate regulations.
Most homeowners have no idea what a U-value is. Your website should translate it: “All our windows meet current building regulations and we self-certify compliance through our FENSA registration… no extra cost, no council inspector needed.” That sentence earns trust because it shows you know the law and you handle the paperwork for them. Do not use technical glazing jargon and leave the homeowner to work out whether they need a building notice or not… remove that friction for them.
Window and door website copy: what to say, page by page
Your homepage is an audition. These are the elements that decide whether you make the shortlist.
Headline: location and credential first
Homeowners searching for a local installer are already filtering by area. Lead with where you work and why you are the choice: “Window and door installation across Sheffield since 2009… FENSA registered, fully insured.” Suburb-level specificity (“serving S1 to S17”) reassures a local buyer that you are not a national van dropping in from 80 miles away. Keep the headline to one clear claim; the rest of the page earns it.
Above the fold: one action, not four
The single most common mistake on window and door websites is four competing buttons… “Get a Quote,” “View Products,” “Contact Us,” “Call Now.” When everything is primary, nothing is. Choose one call to action above the fold: book a free measuring visit, or request a written quote. Make the button benefit-specific: “Book Your Free Survey” tells the homeowner what they get. “Click Here” tells them nothing.
Product pages: specs plus outcomes, not specs alone
For every frame material or door type you offer, pair the specification with the outcome the homeowner actually cares about. uPVC: low maintenance, 20-year life expectancy on quality profiles, competitively priced. Aluminium: slimmer sight lines, powder-coat colour options, ideal for contemporary extensions. Composite doors: 54% of the UK door market in 2024 because they offer the warmth of timber with the security and weather resistance of GRP (SheerWater Glass, 2025). Triple glazing: typically 10 to 20% more expensive than equivalent double glazing but delivers measurable draughtproofing in exposed positions (KJM Group). Pair the fact with what it means for the buyer’s home and bill.
Price transparency: say the range, not “get a quote”
Hiding prices trains homeowners to assume you are expensive. In a market where every competitor has a “call us for a quote” button, being the installer who publishes honest ranges immediately looks more credible. The table below shows typical fitted costs for common jobs based on UK 2026 pricing surveys.
| Job type | Typical fitted cost (UK, 2026) | Key variable |
|---|---|---|
| Single uPVC casement window (supply + fit) | £450 – £850 | Size and glazing spec |
| Full house double glazing (8–12 windows, 3-bed semi) | £3,500 – £5,500 uPVC / £7,400+ aluminium | Frame material and window count |
| Composite front door (standard, fitted) | £1,200 – £1,800 | Panel design, hardware and glass option |
| uPVC French or patio door pair (supply + fit) | approx. £2,000 | Size and glazing |
| Premium aluminium door (with sidelights) | £3,000 – £4,000+ | Configuration and colour |
| Triple-glazed casement, per window | £800 – £2,000 | Frame material and size |
Sources: Checkatrade 2026, Checkatrade door costs 2026. These are guide ranges; your written quote will reflect the exact specification, access, and location.
Publishing this table does not undercut your sales process. It filters out price-shoppers who were never going to book anyway and pre-qualifies the callers who come through. The homeowner who calls after reading the table is ready to discuss their project, not argue about whether you’re in the right ballpark.
Reviews and local search: the two things that feed your website’s enquiries
Your website converts the visitors who arrive. But most homeowners searching “window installer near me” start on Google and choose from the map… they may never reach your site unless you rank in the local results. 71% of consumers always or regularly read online reviews for local businesses before contacting them (BrightLocal, 2025), and the businesses that dominate the local map have the highest review counts and the freshest activity on their Google Business Profile.
For a window and door installer this matters more than for most trades, because the purchase decision takes longer. A homeowner might search, visit your site and your GBP, go away and come back two weeks later. Each touchpoint either builds or loses the case. A profile with 47 reviews and photos of finished jobs holds the trust. A profile with eight reviews and a logo photo does not. The review request you send two days after a successful installation is not an afterthought… it is part of the job. It is also a core part of what we do for window and door installers at ContentWorks: making sure the visibility work and the reputation work happen together, not in separate boxes.
Not sure how your business currently shows up when someone searches in your area? Take the free Visibility Scorecard… four minutes, no sales call, and you will see exactly where your window and door business is losing enquiries to a competitor.
Frequently asked questions
How much does window replacement cost in the UK in 2026?
A single uPVC casement window costs £450–£850 fitted. Replacing all windows in a 3-bed semi typically runs £3,500–£5,500 for uPVC or £7,400+ for aluminium.
The biggest variables are frame material, window size, and the number of openings. Timber and aluminium frames cost more to supply and take longer to fit than uPVC. A ground-floor bay window costs more than a standard casement because of the extra frame sections and the time to measure and fit correctly. Always get a written quote that itemises supply and labour separately so you can compare like for like.
Do I need building regulations approval for replacement windows?
Yes, replacement windows must comply with Part L (energy efficiency) and Part N (safety glazing). A FENSA or CERTASS registered installer self-certifies compliance, removing the need for a Local Authority Building Notice.
The key requirement under Part L 2022 is a whole-window U-value of 1.4 W/m²K or better (or Window Energy Rating B or above). Any FENSA-registered installer installs to this standard as a matter of course and issues you a certificate at completion… essential evidence when you sell the property. If your installer is not FENSA or CERTASS registered, you need to apply for a Building Notice from your local council before the work starts.
What is FENSA and why does it matter?
FENSA is the UK’s leading competent-person scheme for window and door replacement. A registered installer can self-certify that work meets building regulations, and the certificate protects you when selling your home.
CERTASS is the other equally valid scheme… both are accepted by conveyancers and mortgage lenders. The certificate issued at completion is proof the work complies with building regulations without a Local Authority inspection, which saves time and a £200+ building notice fee. If an installer cannot produce a FENSA or CERTASS certificate on completion, you will need to apply retrospectively for a regularisation certificate from your council, which costs more and is not guaranteed.
Is triple glazing worth it in the UK?
Triple glazing costs roughly 10–20% more than equivalent double glazing and delivers the most benefit in exposed, north-facing or draughty properties. The energy saving payback period is typically 15–25 years.
For most UK homes, high-quality double glazing at a U-value of 1.2 W/m²K or below is the practical sweet spot. Triple glazing makes more sense in a highly insulated, new-build context or where sound reduction from a busy road is also a priority… the extra pane adds acoustic performance alongside the thermal improvement. In an average Victorian or Edwardian terraced house, fixing draughty frames, lintels and reveals gives a bigger comfort improvement than the step from double to triple glazing alone.
How do I choose between uPVC, aluminium and timber windows?
uPVC is the most cost-effective and lowest-maintenance option, aluminium offers slimmer frames and more colour choice, and timber suits period properties where planners or conservation rules require it.
uPVC holds around 75% of the UK window market because it performs well thermally, needs no painting, and is competitively priced. Aluminium has grown in popularity for extensions and contemporary builds where thin sight lines and matt powder-coat finishes suit the architecture. Timber is the right call for listed buildings or conservation areas where planners specify it… and it can outlast uPVC if maintained. Ask your installer which material suits your property type and planning position before choosing on price alone.
What should a window installation guarantee cover?
A solid guarantee covers the product (frame and glass), the workmanship (fit, seal and draught-proofing), and should be backed by a deposit protection scheme such as DGCOS or GGF HomePro in case the installer ceases trading.
The product manufacturer typically warrants the frame for 10 years and the sealed glass unit for 5–10 years against misting. The workmanship guarantee… fitting, draught-sealing, hardware adjustment… should be separate. Ask specifically whether the guarantee is underwritten by an insurance-backed scheme, because a warranty from a company that closes in three years is worth nothing. DGCOS and GGF HomePro offer insurance-backed guarantees that survive the installer’s insolvency.
How long does window and door installation take?
A single window or door typically takes 1–3 hours to fit. A full house replacement of 8–12 windows usually runs across 1–2 days, depending on access and the complexity of the openings.
Lead times between survey and installation vary by installer and season: spring and autumn are the busiest periods. A reputable installer will give you a clear schedule at survey stage, confirm the date in writing, and tell you exactly what to expect on the day… whether rooms need to be cleared, whether anyone needs to be home throughout, and what the cleanup process looks like. If the answer to those questions is vague, that is worth noting before you sign the order.
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Dan Jaques is the founder of ContentWorks… local visibility and authority for home-service trades. He helps plumbers, electricians, heating engineers, landscapers and cleaners get found first when nearby customers search… and win more of the calls, enquiries and reviews that follow.
The whole thing runs on one belief: AI-powered, human-led. AI takes on the heavy lifting… the content, the follow-up, the admin that eats your evenings… while a real person keeps the judgement, the quality and the sign-off. It is built on the OMNIlocal™ framework… Appear, Prove, Capture, Compound, Dominate… the five moves that turn a trade who is brilliant at the job into the first name locals recommend.
Dan came up the hard way… market stalls, five high-street shops, then e-commerce… so he builds marketing for people who run a real business, not a marketing department. The aim never changes: authority you own, not attention you rent.