A Guide to 1960s House Extensions in London

Ideas, Costs and Planning Advice for Extending 1960s Homes

The 1960s changed the way Britain lived. Car ownership soared, kitchens filled with new appliances and families wanted lighter, more informal homes than the ones their parents grew up in. Developers responded with wide-fronted semis, chalet bungalows and townhouses featuring picture windows, integral garages and open-plan living rooms, many of which still line the streets of Bromley, Bexley, Croydon, Barnet, Harrow and Kingston.

Sixty years on, the typical 1960s house still has plenty going for it: a sensible footprint, a decent plot and a structure that is generally straightforward to build onto. What it often lacks is a kitchen big enough for modern family life, a strong connection to the garden and enough bedrooms. A 1960s house extension is the most effective way to fix all three, and it is one of the most popular projects Simply Extend delivers across London.

What Makes a 1960s House Different?

A 1960s house is easy to recognise. Fronts are wide and often asymmetric, with large horizontal picture windows, panels of tile hanging or timber cladding and a low-pitched or even flat roof. Many have an integral or attached garage, a canopy over the front door and an open-plan through-lounge running from front to back. Inside, ceilings are lower than in older homes, staircases are often open-tread and the kitchen is usually a modest galley or a small “kitchen-diner” at the back.

Housing standards were changing too. The Parker Morris report of 1961 set out minimum space standards and pushed for more flexible, open layouts, central heating and better kitchens. Its ideas influenced council and private housing alike, and they are why many 1960s homes feel more open than earlier post-war properties.

In London, the most common 1960s homes are semi-detached houses, short terraces and townhouses on new estates, and bungalows and chalet bungalows on larger plots in the outer boroughs. Some estates, such as the well-known Span developments in Blackheath and Ham, were designed by notable architects and are now protected as conservation areas.

Why Are 1960s Houses Good to Extend?

1960s house extensions tend to be among the most straightforward projects we build. Most homes from the decade use cavity brick and block walls on concrete strip foundations, with simple rectangular footprints and few decorative details to work around. That makes it easier to design an extension that connects cleanly to the existing house, whether it continues the original style or takes a more contemporary direction.

The plots help too. Many 60s houses sit on wider frontages than older homes, with a driveway or garage to the side and a good-sized garden behind. There is usually space to extend to the side, the rear or both, and the existing open-plan tendencies of the era mean the original rooms often join up naturally with a new kitchen and family space. Owners who also want to update the outside of the house can combine the extension with new windows, cladding or render, giving the whole property a fresh look in one project.

What Should You Check Before Extending a 1960s House?

A few features of 1960s construction are worth checking at the start of any project:

• Flat roofs: many 1960s garages, porches and rear additions have felt flat roofs that are well past their lifespan. These are usually best replaced or rebuilt as part of the extension.
• Asbestos: asbestos cement was widely used in the 1960s for soffits, garage roofs, flue pipes and textured ceilings. A survey should be carried out before any demolition or structural work.
• Cavity walls and insulation: original cavity walls were often uninsulated or filled later. Where the extension joins the house, the details need care to avoid cold bridges and damp.
• Timber-framed and system-built homes: some 1960s townhouses and estate houses were built with timber frames or prefabricated panels. These can be extended, but need input from a structural engineer.
• Single glazing and old windows: large picture windows from the period are often single-glazed or early double-glazed units. Replacing them at the same time as extending improves comfort and the look of the house.

A full house survey identifies these issues early, so the design and quotation take them into account from day one.

What Are the Best 1960s House Extension Ideas?

The right design depends on the house and the household, but these 1960s house extension ideas come up again and again:

• A full-width rear extension that replaces a small kitchen with a large open-plan kitchen, dining and living space facing the garden.
• A wraparound extension that uses the side passage or driveway as well as the rear, creating an L-shaped space with room for a utility and WC.
• A garage conversion or replacement that turns an integral or attached garage into a study, playroom, utility or extra bedroom.
• A double storey extension that adds a bedroom and bathroom upstairs as well as space below.
• A porch or front extension that adds storage, gives the entrance more presence and updates a plain 1960s frontage.
• A garden room for home working or hobbies, separate from the main house.

Many owners combine several of these into one project. Pairing a single-storey rear extension with a garage conversion, for example, can transform the whole ground floor of a 1960s house without the cost of a two-storey build.

What Are Good 1960s Semi Detached House Extension Ideas?

The 1960s semi is one of the most common homes in outer London, and its wide plot gives owners more choice than most. The best 1960s semi detached house extension ideas make use of the rear garden, the side of the house and, in many cases, the garage. Because the two halves of a pair are usually mirror images, it is also worth looking at what the neighbours have already built, as a matching approach can make planning simpler.

What Are the Best 1960s Semi Detached House Rear Extension Ideas?

A single-storey rear extension is often the first step. With a typical 1960s garden, there is usually room for a substantial kitchen and family space without losing too much lawn. Popular 1960s semi detached house rear extension ideas include:

• Glazing across the full width: sliding or bifold doors that open the kitchen to a terrace, with a picture window or window seat to echo the era.
• Flat roofs with lanterns: a flat roof suits the clean lines of a 1960s house, and roof lanterns or rooflights bring light deep into the plan.
• Higher ceilings in the new space: raising the ceiling in the extension, or stepping the floor down to garden level, counteracts the lower ceilings in the original house.
• Opening up the back wall: steel beams allow the old kitchen and dining room to become part of one large space.
• Broken-plan zoning: a kitchen island, built-in seating or a change in floor finish to define cooking, dining and lounging areas.

What Are the Best 1960s Semi Detached House Side Extension Ideas?

The side of a 1960s semi is usually occupied by a driveway, a carport or a single garage that is too narrow for a modern car. That makes it one of the most valuable spaces on the plot. 1960s semi detached house side extension ideas include:

• Converting or rebuilding the garage as a utility room, boot room, WC, home office or playroom, often with a new front elevation that improves kerb appeal.
• A single-storey side extension that widens the kitchen or creates a separate snug. Simply Extend’s semi-detached side return extension projects show how much space this can add.
• A two-storey side extension above the garage footprint, adding a fourth bedroom or en suite. Councils normally expect the upper floor to be set back from the front and the roof to sit slightly below the main ridge.

Where a 1960s semi has a flat-roofed garage alongside, building a pitched or neatly detailed flat roof over the new side extension can make a big difference to how the whole house looks from the street.

What Makes a Great 1960s House Kitchen Extension?

The kitchen is where most 1960s homes fall short. Designed for a single cook and a few new appliances, the original kitchen is usually too small for a table, an island or the number of people who now want to use it. A 1960s house kitchen extension brings cooking, eating and relaxing together in one space that opens directly onto the garden.

The best designs usually move the kitchen into the middle of the plan, with dining and seating in the new extension closest to the glazing. An island gives a natural focal point and keeps the cook part of the conversation, while a utility room in the old garage or a side extension takes laundry and storage out of the main room.

The era itself is a great source of inspiration. Mid-century style suits a 60s house extension perfectly: warm timber, slim-framed glazing, terrazzo or polished concrete floors, statement pendant lighting and flat-fronted cabinetry in bold or natural colours all feel at home in a 1960s house while looking completely contemporary.

What Are Your Options When Extending a 1960s Bungalow?

Bungalows were hugely popular in the 1960s, and many sit on generous plots with space on several sides. Extending a 1960s bungalow can mean building outwards, upwards or both:

• Single-storey rear and side extensions that add a large kitchen and family room or an extra bedroom, often under permitted development.
• Converting the roof space with dormers or a raised roof to add bedrooms and a bathroom upstairs. This is particularly effective on chalet bungalows, which were designed with rooms in the roof from the start.
• Adding a full first floor to turn the bungalow into a two-storey house. This needs planning permission and a structural check on the existing walls and foundations.
• Reorganising the layout to replace long corridors and small, separate rooms with an open living space at the back and bedrooms grouped at the front.

Most 1960s bungalow renovation ideas start with the extension and work back from there. Once the new layout is set, owners often take the chance to update windows, insulation and heating at the same time, so the whole home performs to modern standards. Many of the most popular 1960s bungalow renovation ideas in the UK, from cladding the exterior to creating a vaulted kitchen, are easiest to deliver as part of an extension project rather than as separate jobs.

Is a Loft Conversion on a 1960s House Worth Combining With an Extension?

For families who need more bedrooms as well as a bigger kitchen, a loft conversion on a 1960s house is often the natural partner to a ground-floor extension. It adds space without using any more of the garden, and doing both together can save on scaffolding, design fees and disruption.

1960s roofs do bring some particular challenges. Many have a shallow pitch, which limits headroom, and from the 1960s onwards roofs were increasingly built with trussed rafters, whose diagonal timbers fill the loft space. Both can be overcome with the right design: a full-width rear dormer, a hip-to-gable conversion on a semi, or new steel beams to replace the trusses. Our sister company Simply Loft specialises in exactly these projects and can plan the loft and the extension together.

How Should a 1960s House Extension Look?

There is no single right answer, but the best 1960s house extensions respect the strong horizontal lines and simple forms of the original house. Flat or very low-pitched roofs, wide openings and a limited palette of materials usually sit more comfortably than steep pitched roofs or heavy traditional detailing.

Some owners match the extension closely to the existing brick and tile hanging, particularly for side extensions visible from the street. Others go for a deliberate contrast at the rear, using timber cladding, render, zinc or dark aluminium glazing. Because 1960s materials are often hard to match exactly, a well-judged contrast can look more considered than a near-miss match. An extension is also the ideal moment for a 1960s house facelift: new windows, a refreshed porch, render or cladding over tired brickwork can tie old and new together so the house looks like one coherent design rather than a series of additions.

What Does an Extended 1960s House Look Like Before and After?

The before and after of a 1960s house extension can be dramatic. Before, a typical semi has a narrow galley kitchen, a through-lounge with a small patio door, a cold flat-roofed garage and a garden that feels cut off from the house. After, the same house has a bright kitchen, dining and family room across the back with wide glazed doors onto a terrace, a utility and study where the garage used to be, and often a new bedroom above.

For many owners, the extended 1960s house becomes the home they want to stay in for decades. Combined with the kind of updates that usually go with a 1960s house renovation, such as better insulation, new heating and modern windows, it can feel like a new build while keeping the generous plot and established setting that made the house appealing in the first place.

How Much Does a 1960s House Extension Cost?

The cost of a 1960s house extension depends on the size and type of extension, the specification of the finishes and how much work is needed on the existing house. A single-storey rear extension costs less than a wraparound, and a two-storey side extension or an extension combined with a loft conversion costs more. As a guide, Simply Extend projects in London start from £50,000.

On 1960s homes, it is worth allowing for a few specific items: asbestos surveys and removal, replacing old flat roofs, structural steelwork to open up the back of the house, and any upgrades to insulation or windows the owners want to make at the same time. The kitchen extension cost is also driven by the kitchen itself, from cabinetry and worktops to appliances and underfloor heating. Professional fees, planning or Lawful Development Certificate applications, Building Regulations approval and party wall costs should be included too.

Every Simply Extend client receives a transparent, detailed quotation before work begins, so there are no surprises and owners can decide where to invest and where to save.

Do You Need Planning Permission to Extend a 1960s House?

Many single-storey 1960s house extensions can be built under permitted development. A single-storey rear extension can usually project up to 3 metres from the original rear wall of a semi-detached or terraced house, or 4 metres for a detached house or bungalow, rising to 6 and 8 metres respectively through the prior approval process. A single-storey side extension can generally go ahead if it is no more than 4 metres high and no wider than half the width of the original house.

Two-storey side extensions, wraparound extensions and adding a storey to a bungalow all need full planning permission. Some 1960s estates had permitted development rights removed when they were built, so it is worth checking the original planning conditions. Architect-designed estates such as the Span developments are often in conservation areas, where councils expect extensions to follow strict design guidance.

Even where planning permission is not needed, a Lawful Development Certificate is strongly recommended. Building Regulations approval will apply to every project, and the Party Wall Act will apply to most work on semis and terraces. Simply Extend’s team checks the planning position of every property and manages the process on the client’s behalf.

Why Choose Simply Extend for Your 1960s House Extension?

Simply Extend has extended 1960s homes across London, from semis in Bromley and Bexley to bungalows in Croydon and Harrow. Rear extensions that open dark kitchens to the garden, garage conversions that create studies and utility rooms, and wraparounds that transform the whole ground floor are projects the team delivers week in, week out.

Every project is handled from first survey to final finish, with in-house design, experienced construction teams and a ten-year guarantee. As part of the Simply Construction Group, Simply Extend can also draw on Simply Architects for more complex designs and Simply Loft for homeowners who want to add a loft conversion at the same time.

Whether you are just starting to explore 1960s semi detached house extension ideas or are ready to move forward, Simply Extend would love to hear from you. Get in touch today to arrange a free consultation, or call us free on 0800 917 7571.

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