Renovating Period Properties: Honouring the History

By My Local London Builder Team | January 25, 2025

Restored Victorian drawing room with original cornicing and marble fireplace

Summary: London owes its character to the Victorian, Edwardian, and Georgian builders who laid its foundations. If you own one of these properties, you are not just an owner; you are a custodian. But renovating them requires a different rulebook. Modern materials can destroy old fabric. This guide is a plea for sensitivity—teaching you how to modernise for comfort without stripping the soul (or the structural integrity) from your home.

being encased in cement render, injected with unnecessary damp proof courses, and sealed with plastic paints. Then, the owners wonder why the bricks are spalling and the corners are mouldy.

A period house is a living, breathing machine. It was designed to manage moisture in a specific way. When we impose 21st-century "hermetically sealed" logic onto 19th-century materials, we cause damage.

The Golden Rule: Breathability

Victorian houses do not have a damp proof course (mostly). They were built with soft, porous bricks and lime mortar. They absorb rain, and then—crucially—they evaporate it. The walls "breathe."

If you cover a breathable brick with waterproof cement render, you trap the moisture inside the wall. It freezes, expands, and blows the face off the brick.
The Fix: Always, always use Lime. Lime plaster, lime mortar, lime render. It allows moisture to pass through.

Sash Windows: The Eyes of the House

Nothing kills the kerb appeal of a period property faster than cheap uPVC windows. The thick plastic frames destroy the delicate proportions.

Restoration vs Replacement:

Draft Proofing: Original sashes can be routered to include invisible brushes that stop rattles and draughts.
Vacuum Glazing: A new technology. It is double glazing, but the gap is a vacuum, so the glass sandwich is only 6mm thick. It fits in original timber frames but insulates like a modern window.

The Brickwork: Pointing Matters

Look at the mortar between your bricks. Is it a hard, grey ribbon standing proud of the brick? That is cement, and it is killing your wall. Ideally, it should be a soft, creamy grit-colour, flush or slightly recessed. That is lime.

Restoring the "Tuck Pointing" (a fine white line on a coloured background) is a high art, but even standard lime pointing will transform the look and health of your facade.

Cornicing and Ceilings

In the 1970s, many homeowners boarded over intricate cornicing to make rooms "cleaner." Taking down those false ceilings to reveal the original plasterwork is the archaeological dig of renovation.

If the cornicing is damaged, do not replace it with polystyrene. We use fibrous plaster moulds to cast identical sections and stitch them in invisibly.

Floors: The Pine Dilemma

Victorian pine floorboards are beautiful, but they are cold. The air brick vents under your house blow freezing wind through the void.

If you want exposed boards, you must lift them (carefully, they are brittle) and suspend insulation nets between the joists before relaying them. Otherwise, your heating bill will be astronomical.

Fireplaces: The Soul of the Room

A sealed-up chimney breast is a sad thing. Even if you don't want a working fire, opening up the aperture and installing a cast iron insert or a wood burner restores the focal point of the room.

Warning: If you open a chimney, it must be swept and tested for leaks. Carbon Monoxide is silent and deadly. Always line the flue.

The Modern Extension

How do you add a modern side return to a period house? We believe in contrast. Don't try to make the extension look "fake old." A crisp, glass and steel extension makes the original brickwork look even older and richer by comparison. Let the old be old, and the new be new.

Frequently Asked Questions

1. Why shouldn't I use modern cement on Victorian brick?

Victorian bricks are soft. Modern cement is hard and traps moisture. If you point with cement, the moisture cannot escape through the mortar, so it forces its way out through the brick, blowing the face off. Always use lime mortar.

2. Can I double-glaze my sash windows?

Yes, but be careful. Thick double glazing ruins the delicate sightlines. Use 'vacuum glazing' or 'slimline' double glazing specifically designed for sash windows to maintain the period look.

3. How do I spot damp in a period house?

Look for a distinct 'tide mark' on walls, salt deposits, or peeling wallpaper low down. However, don't rush to inject chemicals. 90% of damp is caused by blocked gutters or high ground levels outside bridging the air bricks.

4. Should I keep the chimney breasts?

Structurally, they hold the house up. Aesthetically, they are the focal point. We strongly advise keeping them. If you remove them, you need massive steel supports and Party Wall agreements.

5. What is lath and plaster?

It is the original way ceilings and walls were made—wooden strips (laths) covered in horsehair lime plaster. It is messy but has better soundproofing and breathability than modern plasterboard. Keep it if you can.

6. Are original floorboards worth saving?

Often, yes. They are usually high-quality slow-grown pine. However, they are draughty. If you sand them, you must insulate underneath (between the joists) first regulations.

7. Can I install underfloor heating?

Yes, but you usually need to dig up the floor or raise the level. Be careful with solid wood floors on top; the heat can warp them. Engineered oak is more stable for UFH.

8. Do I need permission to paint the outside?

In a conservation area, yes, often limitations apply to colour. If the brick was originally unpainted, the council may refuse permission to paint it as it changes the character of the street.

9. How do I clean the brickwork?

Never sandblast it. It destroys the protective skin of the brick. Use a gentle 'DOFF' steam cleaning system which removes dirt without damaging the masonry.

10. Is it expensive to restore cornicing?

It is a specialist skill. If sections are missing, we take a 'squeeze' (mould) of the existing pattern and cast new sections to match perfectly in fibrous plaster.