1930s house renovation: getting the most from a 1930s semi

Typical construction

Most 1930s semis have a cavity wall of brick outer leaf and brick or block inner leaf, often with no cavity insulation originally installed. Floors are usually suspended timber at ground level with concrete sometimes added later, and roofs are cut timber with slate or clay tile coverings.

Bay windows are common at the front and are usually built off their own foundation, which needs checking before any structural opening is formed nearby.

Common faults in this era of house

Cavity wall ties corroding after decades in place, particularly in exposed coastal locations, cold spots and damp patches where cavities were never insulated, and cracked bay window foundations settling separately from the main house.

Later flat roof extensions from the 1970s and 80s are also common and often need full renewal, since many were built with felt coverings that have well exceeded their working life.

• Corroded wall ties in coastal-exposed brickwork
• Uninsulated original cavities causing cold rooms and condensation
• Bay window foundations settling independently of the main structure
• Ageing flat roof extensions needing full renewal rather than patching

Sensible upgrade order

Address the roof and any old flat roof extensions first, since these are the most likely sources of ongoing water ingress. Then deal with wall tie condition and cavity insulation, which improves comfort before you spend on decoration.

Structural openings for open-plan living or a rear extension come next, followed by kitchen and bathroom refits and finally cosmetic decoration, so you are not redecorating a room twice.

Practical constraints in South Devon

Many of these semis sit on sloping plots typical of Torquay and Paignton hillsides, which affects extension design, drainage falls and where excavated material can go during groundworks.

Shared driveways and boundary fences with the neighbouring semi mean access for machinery and materials often needs a conversation with next door before work starts.

Planning a 1930s house renovation room by room

A 1930s house renovation works best when the whole house is looked at before any single room is started. Many semis of this era have had piecemeal changes over the decades: a replaced kitchen, a later bathroom, a small rear addition or a blocked-up fireplace. Listing what is original, what has been altered and what has failed gives a clear picture of where the money needs to go first.

Start with anything that affects the structure or keeps water out, such as the roof, chimneys, bay window and any old flat roof addition. Then plan the hidden work, including rewiring, heating and plumbing, before plastering and decoration. Agreeing kitchen and bathroom positions early stops new finishes being cut open later for pipes or cables.

Extending or converting a 1930s semi

The hipped roofs, generous rear gardens and side access found on many 1930s semis make them well suited to adding space. A rear kitchen extension, a side extension over a former drive or a loft conversion are all common ways to make the layout work for modern family life. Each needs checking against the existing foundations, the roof structure and what approvals apply to the address.

If you are thinking about more space on the ground floor, see how we plan house extensions around existing walls and drainage.

For hipped roofs, a hip-to-gable loft conversion is often the way to create usable headroom.

Whole-house projects are covered on our renovations and refurbishments page.

Common questions