aWindow.

Made to measure · London and surrounding areas

Keep the character. Renew the comfort.

Made-to-measure timber sash windows for homes where the details matter. From a single room to a complete bay, aWindow brings traditional proportions together with carefully specified glazing and smooth vertical opening.

Request a sash window estimate Discover the difference
White-painted timber sash bay window within an ornate white masonry surround, viewed from outside.
Installed by aWindowSash windows within a decorative bay surround

The difference is in the detail

The character you love. A better everyday window.

A good replacement should feel at home from the street and make a difference from inside. We bring the proportions, opening mechanism and glazing together around your house and the way you use each room.

  1. A window that belongs

    Meeting rails, mouldings and glazing bars shape the face of a period home. We consider those details across the whole opening, so a new sash respects the architecture rather than looking like an off-the-shelf replacement.

  2. Comfort you can specify

    Glazing and draught seals can improve comfort without losing the sash-window appearance. Tell us whether cold rooms, street noise or privacy matter most; we will check the options against the frame depth and the weight the sash mechanism can support.

  3. Made for everyday living

    Vertical sliding leaves leave your room and the space outside clear. A double-hung arrangement lets you open the top, bottom or both. The balance mechanism is selected for the glazed sash, with handles, fasteners and restrictors agreed at survey.

Timber and finish

Choose timber for the way it will live.

The right timber is a specification decision, not simply a hardwood or softwood label. Species, construction, exposure and coating all influence how your windows perform and how you care for them.

Hardwood

Character in the grain

Hardwood options, including Meranti, offer a different grain and material character. Natural durability varies by species and grade, so we match the timber and protective finish to the opening. Choose a suitable stain to express the grain, or paint for a colour that complements the house.

Redwood

A considered painted finish

Joinery-grade Redwood offers another route to traditional painted windows. The timber specification and coating need to suit the opening and its exposure. We discuss the appearance you want, access for maintenance and the practical differences before you choose.

Timber can be repaired or refinished where its condition allows. Both hardwood and Redwood need regular finish checks and recoating when needed. See timber aftercare

Installed by aWindow

See what thoughtful replacement looks like.

These aWindow installations show more than a window in isolation: the rhythm of a bay, the alignment of meeting rails and the effect of fine glazing bars on a view. Look through the photographs, then explore a complete timber project.

See the Westbourne Park Villas timber project

Choose the right sash

Two ways to balance a beautiful sash.

01 / Cords and weights

Traditional box sash

Cords and pulleys run to concealed counterweights. A good starting point when replacing an original box sash, where the opening can accommodate a weight box.

Explore traditional weighted sash

02 / Spiral balances

Spiral-balance sash

Concealed spring balances support the sash. Worth considering where there’s less room at the sides. We check the opening and the weight of the glazed sash at survey.

Explore spiral-balance sash
Compare both systems in detail

Start your project

Let’s get the details right for your home.

Start with your postcode, an approximate window count and a photograph if you have one. We can discuss the right approach before a measured survey brings the proportions, glazing, timber and finish together. Furniture and security choices are discussed with you at survey.

Request a sash window estimate
  • Your project postcode
  • Roughly how many windows
  • A photo of the existing windows, if you have one

More from aWindow

One home. A considered collection.

A sash may suit the front elevation while another opening calls for casements, French doors or an entrance door. Explore the rest of our timber range and bring the decisions together.

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