Gwynedd & Anglesey · Wales

Aluminium Windows in Gwynedd & Anglesey

If your windows in Gwynedd & Anglesey are faded, draughty or hard to lock, we can survey them and quote for slim, low-maintenance aluminium replacements.

Guide from £925
5 towns covered
Postcode areas LL

Aluminium windows in Gwynedd & Anglesey

The price of aluminium windows depends on the size and number of frames, the profile system, opening sashes, colour and finish, glass specification and access. Dual colours, special finishes, glazing bars and triple glazing add cost. See the guide prices for typical ranges, and the written quote fixes your figure.

Modern aluminium window frames contain a thermal break: strips of low-conductivity material, usually polyamide, that separate the inner and outer aluminium. Without it, heat passes straight through the metal. Older aluminium windows made without thermal breaks are a common cause of cold frames and streaming condensation.

Powder-coated aluminium does not need painting, but it does need cleaning. Wash frames with warm water and a mild detergent a few times a year, rinse, and avoid abrasive pads or solvents. Clean more often near the sea or busy roads, where salt and grime sit on the surface for longer.

Aluminium frames are usually finished with polyester powder coating, baked on at the factory in a choice of RAL colours and in matt, satin or textured finishes. Dual-colour frames are possible, such as anthracite grey outside and white inside, so the windows can suit both the street and the room.

White rendered house with slim grey aluminium windows and a large picture window

Towns we cover for aluminium windows in Gwynedd & Anglesey

Choose your town for local details, nearby areas and the postcode districts we cover.

What applies in Gwynedd & Anglesey

In Wales, Approved Document N covers safety glazing: safety glass is needed in and around doors and in low-level glazing where people could walk into it.

In Wales, replacing a whole window or glazed external door is building work and is notified either by an installer registered with a competent person scheme or through the local authority's building control. Replacing only the glass in an existing frame is treated as a repair.

Gwynedd & Anglesey has its own coastline, so for homes and businesses near the sea, salt air and wind-driven rain are part of the brief. Salt air attacks metal finishes, so aluminium windows near the coast need a coating and pretreatment suited to marine exposure, stainless or protected hardware, and more frequent washing. Check that the coating terms allow for a coastal site before ordering.

Rural homes often mix old stone walls with modern extensions, and aluminium suits both when profiles are chosen carefully. Irregular openings are measured individually, and exposed sites benefit from systems with high weather ratings and well-sealed joints against driving rain.

Guide prices

Guide prices inc VAT for typical jobs. Remote and island locations are quoted by arrangement. Your written quote fixes the price after measuring.
Typical job	Guide price inc VAT
Casement window, 900 × 1050 mm	£925 – £1,195
Casement window, 1200 × 1200 mm	£1,095 – £1,395
Large window, 1800 × 1500 mm	£1,495 – £1,995
Slimline heritage style, 1200 × 1200 mm	£1,295 – £1,695

Choosing your aluminium windows

Steel-look windows

Very slim frames with glazing bars that mimic traditional metal windows, adding thermal performance and double glazing to the classic look.

Dual-colour powder coat

A different colour inside and out, such as anthracite grey outside with white inside, from a wide range of RAL colours and textures.

Flush casement

Sashes sit level with the outer frame for a clean, timber-like look, often chosen for period-style or contemporary homes.

Tilt and turn

Inward-opening sashes that tilt for secure ventilation or swing open for cleaning and escape, useful for flats and high floors.

Aluminium Windows in Gwynedd & Anglesey: questions

Do aluminium windows get condensation on the frames?

Modern thermally broken aluminium windows are far less prone to frame condensation than older aluminium windows made without a thermal break. Condensation can still form on any window if a room is humid and poorly ventilated, so trickle vents, extractor fans and sensible heating still matter. Warm-edge spacer bars also help keep the edges of the glass warmer.

Can aluminium windows replace original steel windows?

Yes, steel-look aluminium windows are designed for this. They copy the slim frames and glazing bars of old metal windows while adding double glazing and a thermal break. Original steel frames are often set into the masonry, so removal can disturb render or plaster, and the survey checks this. Listed buildings and conservation areas may need consent first.

What guarantee do aluminium windows come with?

Manufacturer guarantees apply to the frames, powder coating, hardware and sealed units, and the terms are confirmed in writing. Coating cover often depends on the site environment and on regular cleaning, so read the conditions. Guarantee terms for the installation are set out in writing with your quote, before you agree to go ahead.

How do I look after powder-coated aluminium windows?

Clean powder-coated aluminium windows with warm water and a mild, non-abrasive detergent a few times a year, then rinse and dry. Avoid scouring pads, solvents and pressure washers close to the seals. Keep drainage slots clear and put a little light oil on hinges and locking points. Near the coast, more frequent washing removes salt deposits.

Which parts of Gwynedd & Anglesey do you cover for aluminium windows?

We cover the whole of Gwynedd & Anglesey, including Bangor (Gwynedd), Holyhead, Caernarfon, Pwllheli and Dolgellau, and postcode areas LL. Building rules for aluminium windows here follow the regulations for Wales. Enter your postcode on the quote form and we will confirm cover; then a glazier will arrange a free survey before giving you a written quote.

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