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WINDOWS THAT SAVE ENERGY. SERVICE THAT BUILDS TRUST

Windows and doors fitted with care across Wales & the West

Real homes, skilled installation and honest advice from your first visit to the final fitting.

TRUSTED, LOCAL, PREMIUM CHOICE FOR WINDOWS AND DOORS

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See the difference

Real homes. Real Sureseal customers.

See how new windows and doors have made a difference to homes across Wales & the West. Watch the transformations, hear from the homeowners, and explore the details of each installation.

Aberaeron, Ceredigion

Aberaeron farmhouse transformation

Replacement uPVC sliding sash windows and a composite rear door for a century-old stone farmhouse.

The homeowners explain how the new windows reduced outside noise and made it possible to open their windows properly again.

Watch the Aberaeron customer story on YouTube

Narberth, Pembrokeshire

A cottage full of character

Charcoal sliding windows and French doors leading to the sun house, chosen to suit this distinctive cottage.

Watch the Narberth installation on YouTube

Cardiff

A fresh connection to the garden

Sliding patio doors, French doors and uPVC casement windows complete the rear of this family home.

Watch the Cardiff installation on YouTube

Ystalyfera, SA9

New windows and a composite door in Ystalyfera

New uPVC windows and a composite front door, replacing the home’s original windows after problems with fittings, handles and seals.

Watch the Ystalyfera installation on YouTube

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BOOK A VISIT

No pressure to buy, just honest advice and good old fashioned customer service

warmer, quieter, safer

Double glazing

If you’re comparing double glazing, windows and doors for your home, you want three things: proven energy savings, designs that suit your property, and installers you can trust. Sureseal Windows delivers all three — A rated energy efficient windows, secure doors, heritage-sensitive options and a no-pressure service from FENSA registered installers.

Choose from a complete range of double glazing, uPVC windows and doors designed for British homes and weather. From timeless sash to modern flush casements, from composite front doors to aluminium bi-folds, we match style with performance so your windows and doors look right and work hard.

uPVC windows: casement, flush, tilt and turn, sash and heritage sliding sash — all engineered as energy efficient windows to keep heat in and noise out.
Double glazing and triple glazing: advanced low-E glass, warm-edge super spacers and argon-filled units to achieve low U-values and A rated windows.
Doors: composite doors, French doors, patio doors and aluminium bi-fold doors with PAS 24-ready security and multi-point locking.
Roofline: fascias, soffits, guttering and cladding to protect your home and finish the installation properly.
Porches: create a warmer entrance and extra storage while complementing your new windows and doors.

Why homeowners choose our local double glazing company

A rated windows and doors as standard options, with upgrades to triple glazing for maximum comfort and efficiency.
Heritage expertise: sympathetic profiles, wood-effect finishes and slim sightlines for conservation sensibilities.
FENSA registered installers: compliance with Building Regulations and certification for your records and future sale.
End-to-end accountability: no subcontractors — survey, installation and aftercare are handled by our own window installers.
Clear pricing and no hard sell: we specify what’s right for your home, not what’s easiest to sell.
Long guarantees and responsive aftercare: we remain available for advice and aftercare following your installation.

Performance you can feel — warmer, quieter, safer

Great double glazing is about more than a new look. Our energy efficient windows reduce heat loss, cut draughts and help stabilise your room temperatures, while modern seals and laminated glass options dampen exterior noise. For security, reinforced frames, high-spec hinges and cylinders, and PAS 24-ready configurations on doors add peace of mind without compromising style.

Styles that suit every property — from cottages to contemporary homes

Whether you live in a stone farmhouse, a Victorian terrace or a modern build, we can pair uPVC windows and doors to your architecture:
Sculptured and chamfered casements for classic kerb appeal.

Flush sash uPVC windows for a timber-look aesthetic with minimal upkeep.
Sliding sash for period charm with smooth operation and modern thermal performance.
Tilt and turn for flexible ventilation and easy cleaning.
Composite doors for bold entrances with authentic grain textures and colour choice.
Aluminium bi-fold doors for open-plan living and wide garden views.

Our simple process — from quote to certified installation

Discovery and advice
Tell us what you want to achieve — warmer rooms, quieter bedrooms, a smarter entrance — and we’ll shape options around your budget and priorities. If you need windows on finance, we’ll show you the routes available.
Detailed survey
Our surveyors take precise measurements, confirm opening styles, sightlines and cill details, and check for any heritage considerations so your double glazing fits first time.
Made-to-measure fabrication
Your uPVC windows and doors are built to your chosen specification, including glazing type, colour, hardware, security and trims.
FENSA-certified installation
Our window installers arrive on time, protect floors and furnishings, remove old frames, install and seal your new double glazing, then tidy thoroughly. You receive your FENSA certificate and warranty paperwork.
Aftercare and maintenance
We show you simple upkeep tips and remain on hand for aftercare advice or future upgrades like additional doors or roofline.

Energy savings and compliance — A rated windows explained

A rated windows are assessed on total energy performance, balancing heat loss, solar gain and air leakage. In practice, that means multi-chambered uPVC profiles, low-E coatings that reflect heat back inside, argon gas between panes and warm-edge spacers that reduce condensation risk. Combine these features with professional sealing and your double glazing can help cut heating bills, improve EPC ratings and make rooms feel more comfortable all year.

Secure doors that look the part

Your front door does a lot: welcome guests, keep intruders out and protect against the weather. Our composite doors feature dense insulating cores, robust skins and multi-point locks, while our French doors, patio doors and aluminium bi-fold doors are engineered for smooth operation and strong weatherseals. Choose classic or contemporary styles to complement your windows and doors and complete the look of your façade.

Advice, Quotes & Design Visits

Heritage-sensitive upgrades without compromise

If your home sits in a conservation-sensitive location, we can recommend uPVC windows that achieve the fine proportions and woodgrain finishes associated with timber, including flush sashes and slim glazing bars. You’ll retain character while gaining the practical benefits of modern double glazing: easy cleaning, excellent insulation and reliable security.

Colours, finishes and details that make a difference

From white and cream to contemporary greys and blacks, plus dual-colour options, your uPVC windows and doors can be tailored to your palette. Add period hardware, astragal bars, deep cills and textured finishes to echo traditional joinery, or keep lines crisp and minimal for a modern look. Every installation is made-to-measure, so your double glazing fits precisely and performs from day one.

Finance made simple — windows on finance with clear terms

If you prefer to spread the cost of your double glazing, ask about windows on finance. We’ll outline options in plain English and help you choose a comfortable monthly plan. Finance can make upgrading to energy efficient windows and secure doors more accessible, especially for full-house replacements or when combining windows and doors with roofline.

Local coverage — trusted window installers across Wales and the West

We’re a local double glazing company serving homeowners across SA, CF, NP, LD, SY, HR, WR, GL and BS postcodes, including Cardiff, Swansea, Newport, Hereford, Worcester, Gloucester, Cheltenham, Bristol and nearby towns. Whether it’s sash uPVC windows in a Georgian terrace, replacement windows for a rural farmhouse or a statement composite door for a modern estate home, our team knows the properties and the climate of the region.

Honest pricing, tidy work and long guarantees

With Sureseal Windows, there’s no hard sell. We provide clear, itemised quotations, realistic timelines and tidy, respectful installation. Your A rated windows and secure doors come with robust guarantees, and because we’re your installers, you always know who to call for advice and aftercare following your installation.

Advice, Quotes & Design Visits

Frequently asked questions about double glazing, windows and doors

How long do uPVC windows last?

Quality uPVC windows typically last 20–35 years depending on exposure, maintenance and installation quality. Our energy efficient windows are made-to-measure and professionally sealed to maximise lifespan.

Are composite doors secure?

Yes. Composite doors use rigid cores, strong skins and multi-point locking. We specify high-security cylinders and PAS 24-ready hardware options for enhanced protection.

What makes an A rated window?

An A rating reflects excellent overall performance, including low U-values, good solar gain and minimal air leakage. In practice, that comes from quality frames, modern glazing and careful installation.

Can I upgrade some windows now and the rest later?

Absolutely. Many homeowners phase their double glazing. We’ll keep designs consistent so your uPVC windows and doors match as you complete each stage.

Do you handle building regulation compliance and certification?

Yes. As FENSA registered installers, we self-certify compliant installations and provide certificates for your records.

Ready to compare options for double glazing, windows and doors?

Tell us a little about your home and what you want to achieve — warmer bedrooms, quieter living spaces, an inviting entrance — and we’ll design a tailored specification. From energy efficient uPVC windows to secure doors and roofline upgrades, Sureseal Windows makes it simple to transform your home with trusted local service.

HERITAGE-SENSITIVE DESIGNS

Premium windows & doors

Custom Window Installation

Expertly crafted windows tailored to your specific needs.

Door Installation & Replacement

High-quality doors designed for security and style.

Energy-Efficient Solutions

Windows and doors that enhance energy savings, year-round.

French & patio doors

Well-fitted garden doors that bring in light and connect your home to the outdoors.

Consultation & Design Services

Personalised guidance to match your home's unique style.

Commercial Windows & Doors

Durable, efficient solutions for businesses of all sizes.

Advice, Quotes & Design Visits

CLIENT TESTIMONIALS

Our Happy Customers

Videos & Advice

Get practical window advice with Dai Windows, or enjoy a lighter look at Sureseal through our creative Lego videos.

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Advice, Quotes & Design Visits

Sureseal Windows provides energy-efficient windows, doors and home improvements, using quality materials and expert workmanship to make your home warmer and more comfortable. No pressure selling – just honest advice and good old-fashioned customer service.

Contact Us

info@suresealwindows.org

Sureseal Windows Limited
Unit 1 Pontarddulais Workshops
Pontarddulais, Swansea,
SA4 8SG

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Credit is subject to status and affordability. Sureseal Windows Limited, Unit 1 Pontarddulais Workshops, Pontarddulais, Swansea, SA4 8SG, FCA Register no. 764026 trading as Sureseal Windows is a credit broker, not the lender and is authorised and regulated by the Financial Conduct Authority. Credit is provided by a panel of lenders with whom we have a commercial relationship (so we cannot provide independent advice) | Registered in England and Wales No 10035258, VAT No GB296090869.