Case Study, Learning Centre

Case Study: A Brighter, Warmer Hallway in Clapham’s Conservation Area

Location: Lillieshall Road, Clapham, London SW4
Property Type: Victorian Terrace
Homeowner: Christine
Product Installed: New Double Glazed Timber Box Sash Window “Clapham Range”

November 22, 2025

⭐ Overview

Christine has lived in her beautiful Victorian terrace on Lillieshall Road, Clapham, for many years. Like many homes in the area, it falls within a conservation zone, meaning any window replacements must stay true to the property’s original appearance.

Since 2013, Christine has trusted Novells Sash Windows to gradually replace her original single-glazed windows with our handcrafted, conservation-compliant double-glazed timber box sash windows.

Her most recent installation, completed in November 2025, focused on a single sash window on the stairwell, bringing new life and warmth to this much-used space.

❄️ The Problem

Christine’s old sash window had developed all the classic issues found in original single-glazed sash windows:

Cold draughts throughout the hallway and stairs
Condensation forming on the glass and black mould on the woodwork
Cracked and flaking paint caused by moisture-damaged timber
Noticeable outside noise and poor insulation

For a home that otherwise felt warm and inviting, this one window had become a constant source of frustration.

? The Challenge

Because Christine’s home sits within a designated conservation area, any new window had to be like-for-like in timber, matching the style, proportions and detailing of the original frame.

Having worked with us for over a decade, Christine knew she could rely on Novells Sash Windows to deliver a solution that was:

Authentic in design, matching the original Victorian style
Fully compliant with local planning and building regulations
Built to last, using only high-quality treated timber and paint finishes

? Our Solution: The Clapham Range

For this project, we supplied and fitted a new double-glazed timber box sash window from our Clapham Range, a collection created specifically for homes in Clapham and the surrounding conservation areas.

Each window is:

Crafted from engineered Redwood for strength and stability
Fully spray-painted in white using a durable microporous coating
Finished with traditional sash horns and authentic mouldings
Supplied ready to install, requiring one final top coat to the interior box frame and architrave

The installation was completed in one day, with minimal disruption and a perfect fit.

?️ The Outcome

The transformation was immediate.

The hallway and stairs became brighter, warmer, and quieter
Condensation and black mould disappeared completely
The window’s flawless white finish complemented the interior décor
The property’s original period charm was preserved, fully compliant with conservation regulations

Christine was delighted: the new sash window not only solved years of cold and damp but also uplifted the feel of her entire hallway.

? A Relationship Built on Trust

Christine’s home tells a story of craftsmanship and consistency. Since 2013, we’ve replaced her windows one at a time, each crafted to match, each fitted with care.

Her continued trust in Novells is exactly what we strive for: a long-term partnership built on reliability, expertise, and respect for period homes.

? Thinking About Replacing Your Sash Windows?

If, like Christine, you live in a conservation area and want to keep the authentic look of your period home while improving warmth and comfort, our Clapham Range could be the perfect choice.

? Get in touch today for friendly advice or a no-obligation quote.

We’ll help you enjoy your home’s timeless charm, without the draughts, rattles, or condensation.

Frequently asked questions

Are double glazed sash windows allowed in Clapham’s conservation area?

Yes: As long as they’re timber and match the original style. Our Clapham Range is specifically designed to meet these requirements.

How long does a single sash window replacement take?

Typically one day, including fitting and finishing.

Can you match my existing sash windows?

Absolutely. All our windows are made to measure, ensuring a like for like match in detailing, horns, and glazing bar configuration.

About the author

As Co-founder of Novells Sash Windows, Philip has spent over 20 years perfecting the craft of designing, supplying, and fitting luxury wooden double-glazed box sash windows.

A family-run business led by Philip and his wife Nicola, Novells has fitted thousands of wooden windows across London and Surrey, with clients including Vivienne Westwood and the Victoria & Albert Museum.