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How to Extend and Remodel Terraced Homes

A side-return extension is the ideal way to increase space and light in a terraced house
(Image credit: Design Squared)

Often the layout of terraced homes – small kitchens, ground floor bathrooms, small, separate reception rooms with little natural light and tiny to non-existent hallways – don’t quite suit modern lifestyles.

But, there’s so much potential with a terraced house: it’s whether to extend or remodel that’s the big question.

In this guide we share how clever design tweaks can really help transform your terraced house, opening up rooms and extending the footprint to create a home that suits how we live today.

What Should I Consider Before a Terraced House Extension or Remodel?

Combining the kitchen and dining room here makes the most of the house’s features

Original features are what make terraced houses so appealing. Combining the kitchen and dining room here makes the most of the house’s features (Image credit: Mae House Design)

Before beginning terraced house extension or remodelling project, research ceiling prices on the road — the maximum value of any house in a certain area. Bear in mind that your house will still be a terrace, surrounded by other terraces, and this will inevitably have an effect on what it will eventually be worth.

Calculate your extension cost with our free extension cost tool

Consider which projects will add the most value. Ensure your plans overcome the most negative aspects of the original house, for example a tiny kitchen or ground floor bathroom. You are almost always onto a winner by adding well-planned bedrooms and en suites.

Sometimes there is just no scope to add an extension to a terraced house – perhaps due to restrictions on your budget, a shared rear access, listed status or just a lack of space to work with – in which case a remodel is the way to go.

Combining the two separate reception rooms in this house means that light is now able to flow better through the spaces

Combining the two separate reception rooms in this house means that light is now able to flow better through the spaces (Image credit: Mustard Architects)

Terraced House Extensions and the Party Wall Act

  • If your extension will be up to the boundary of a neighbour’s property or on or up to a neighbour’s wall, you will need to pay attention to the Party Wall Act
  • No new windows should normally be placed within 2.4m of the boundary that they face. For two storey extensions there should be no side windows at first floor level that can overlook neighbouring houses. 

(MOREBeginner’s Guide to Building an Extension)

Improvements You Can Make to a Terraced House

  • Add a side-return extension to create a kitchen diner
  • Create an entrance hall
  • Increase natural light
  • Add a downstairs WC
  • Convert your basement
  • Add more bedrooms
  • Move a bathroom upstairs
  • Convert your loft

Create a Kitchen Diner in a Terraced House Extension

A side-return extension is the ideal way to increase space and light in a terraced house

A side-return extension is the ideal way to increase space and light in a terraced house (Image credit: Design Squared)

Small, narrow kitchens or single-skin brickwork add-ons are very common in Edwardian and Victorian terraces. They also often adjoin an outside WC and/or coal store.

The most cost-effective way of gaining extra kitchen space in a terraced house is to knock through into these spaces to simply incorporate them into the new kitchen, although this option does not offer much scope for changing the narrow galley-style layout.

One of the most popular ways to get a bigger kitchen in a terraced house is to create a side-return extension. Generally, this adds around 1-2m to its width.

(MOREHow to get an open-plan space right)

Within this side-return extension, a kitchen diner has been created

Within this side-return extension, a kitchen diner has been created, with living space in a new rear extension (Image credit: Design Squared)

This idea also opens up the opportunity to extend out at the rear at the same time (or perhaps incorporate those outbuildings).

Adding a side-return terraced house extension is also the ideal place to use large areas of glazing to help bring natural light into the home. Consider a glazed roof or a bank of rooflights. A clerestory window is also sometimes incorporated into the wall overlooking the neighbours, providing light but without losing privacy. (Check out these great ideas for bringing in light from above).

A swathe of bi-fold, sliding or French doors is also a popular addition to this style of extension.

Creating a New Entrance Hall in Your Terraced House

Removing the wall that separates the stairwell from the middle reception room in this terraced house opens the space up and overcomes the problem of a small, dark hallway

Removing the wall that separates the stairwell from the middle reception room in this terraced house opens the space up and overcomes the problem of a small, dark hallway (Image credit: Design Squared)

The majority of terraced houses will not have much of entrance hall — in fact some don’t have one at all, with the front door opening directly into the living space.

There are several ways in which to overcome this.

Removing the wall that separates the hallway from the front reception room is a common solution. If you would like some form of division between the front door at the rest of your space, consider partial stud walls and glazed room dividers.

Within this terraced house the entire ground floor layout has been opened up, with the use of partial glazed divides creating zones within the space

Within this terraced house the entire ground floor layout has been opened up, with the use of partial glazed divides creating zones within the space (Image credit: Mae House Design)

With the hallway gone, it is worth considering what the front section of the house will be used for. Accessing a kitchen dining space directly from the front door can be more preferable that walking straight into the living space.

Another way to open the hallway up is to remove the wall separating the stairwell itself from the middle reception room.

Reverse the Layout and Add Space

Another option is to reverse the typical layout of the house, relocating the kitchen to the front of the house and merging it with the middle room to create a large, light kitchen dining room.

You could then add a side-return extension to open up the former kitchen and turn this into a new living area with access out into the garden beyond.

There is actually a great deal you can do to a terraced house without applying for planning permission, and these works fall within your Permitted Development rights. You will not usually need to apply for planning permission for a terraced house extension if:

  • It is not any nearer to the highway than the nearest part of the original house, unless there would still be 20m of clear space between the house and the highway
  • It covers no more than 50% of the area of land around the original house, taking into account outbuildings
  • It will be no more than 4m in height and within 2m of the property boundary and no more than 6m deep if single storey or 3m for two a two-storey extension
  • The volume will not be increased by more than 10% or 50m³ (whichever is greater up to a maximum of 115m³)
  • The house is not listed or in a Conservation Area

Flooding a Terraced House with Natural Light

Light-filled open plan kitchen-diner

By removing the wall separating the dining room and kitchen, and adding roof lanterns and glazed doors, light can now flow freely between the spaces (Image credit: Design Squared)

Some of the most typical terrace layouts include a front room, originally a parlour; a middle room, (often now used as a dining room)  and a back room, intended as a scullery or kitchen. The nature of this layout often results in a middle room that suffers from a lack of natural light, either due to having just one small window or sometimes none at all.

There are several ways in which to rectify this problem. The easiest – and often cheapest – solution is simply to open up this middle room into the front room, creating an open plan living/dining area and allowing the middle room to be flooded with light from the often large, sometimes bay, front window.

Side return extension with clever glazing to flood space with natural light

This clever side-return extension is almost entirely glazed, ensuring the kitchen dining space is full of natural light (Image credit: Design Squared)

Those who are reluctant for the two rooms to become one should consider installing a sliding glass partition or archway between the two to create a more flexible arrangement. In order to get even more light into this area, take a look at the possibility of replacing the current small window in the middle room with a set of French doors leading out into the garden — adding a fanlight will draw even more light in.

If you want to take things a step further, consider merging this middle room with the kitchen. Although this option often involves a little more structural work in the form of the removal and addition of walls, not only will it provide a lighter, more open dining room, but it will also result in a larger kitchen.

Adding a Downstairs WC

Most buyers these days expect a house to have a downstairs WC and it should not be too hard to make space for one in your terraced house. When deciding on the best location for your new WC, bear in mind that the minimum practical space around standard sanitaryware in a WC is 200mm on each side and 600mm in front.

The ideal locations for new WCs are either off the utility room or a main hallway, and although the Building Regulations no longer prevent you from having a WC directly off a living room, kitchen or dining room (there must still be a door), do consider how this will work in everyday life and think about privacy — will guests really want to use a WC leading off the dining room during a dinner party?

Understairs areas and storage cupboards provide lots of scope for a new WC, as do old attached coal stores or outside loos.

Consider Converting the Basement

Many Georgian, Victorian and Edwardian terraced houses were built with cellars, but whether or not it will be worth your time and money to convert your basement depends on a number of factors. In high-value areas, such as London, the cost of the work compared to the resultant end value of the extra space gained often makes sense.

However, terraced streets have a ceiling value and you might find that you never make back the money you spend on converting the cellar in this instance.

Although planning consent is unlikely to be required, you may be up against some technical hurdles. Most cellars in terraced houses have low ceilings, so to become extra living space, the floors will need to be excavated.

This involves expensive underpinning of shallow foundations — something that will at least double the cost of converting a cellar with sufficient headroom, seeing costs rise from around £1,000-1,350/m² to around £2,000-4,000/m². These old cellars usually suffer from damp too, and so will need to be tanked, plus light and ventilation will also need to be considered.

(MORE: Basement Design Guide)

Moving the Bathroom Upstairs

A large number of pre-twentieth century terraces were not built with bathrooms at all — a toilet in an outbuilding and a tin tub in front of the fire were sufficient.

As a result, bathrooms were often added to these homes during the 1950s and 1960s, usually tacked on to the end of a galley kitchen extension.

Monochromatic shower room

Borrowing space from two bedrooms on the first floor in order to create an upstairs bathroom is a popular project, certain to increase the value of a house (Image credit: Design Squared)

There are several ways to overcome this problem — you should weigh up the costs involved with how long you plan to stay in the house and how much it will add to its end value.

Moving the bathroom upstairs may well will mean losing a bedroom. For this reason, many owners of terraced homes convert the loft or create a two storey extension in which to house another bedroom.

It is usually most convenient to use a bedroom at the back of the house for the new bathroom (or wherever is above the kitchen) as that is where the soil pipe is mostly likely to be located and connecting to existing plumbing should be easier.

It is sometimes possible to steal space from two adjoining bedrooms in order to create a small new bathroom. Bear in mind that at least 4.5m² makes for a comfortable bathroom space.

Add More Bedrooms

Adding an extra bedroom is a fantastic way to add value to a house. Avoid the temptation to simply retain or create a new ground floor bathroom in favour of having three bedrooms on the first floor — this is bound to put off potential buyers.

Unless you are planning a loft conversion, the most obvious way of gaining a new bedroom is to add a two-storey extension to the rear of the house.

Adding a two-storey extension to your terraced house is actually a very cost-effective method of gaining extra space, working out 20% cheaper to build per m² than single-storey extensions, as the cost of the groundworks and roof is effectively halved, being spread between two floors. Building a two-storey extension also means that you get more space, without having to eat into your garden area.

(MORETwo Storey Extension Design Ideas)

Depending on how many extra bedrooms you plan on adding, consider the final bedroom-to-bathroom ratio. As a general rule there should be one bathroom for every three bedrooms, so adding a fourth bedroom may also warrant the addition of an en suite.

Convert Your Loft

Before you do anything else, check that a loft conversion is actually viable. The amount of space you will have all depends on the height and pitch of the roof. You can take a look at this feature on loft conversions for difficult roof constructions if you are worried your roof will not allow a standard ‘room in roof’ conversion.

You need at least 2.3m of clear headroom for an area to be considered ‘usable’, plus you will need to take into account enough space with clear headroom for staircase access too. An architect or loft conversion specialist will give you an idea of how much space you will have and the options available. In addition, you need to think about where the stairs to this new room will go. Do you have space to reconfigure your existing staircase or to add a new one?

It is possible to adapt the roof structure to create more usable space, and any bulky water tanks can be discarded and replaced with a combination boiler in the kitchen to provide more space — but you need to weigh up how much value all this work will add, compared to what it is going to cost.

A simple conversion for storage will fall at the cheaper end of the spectrum. However, a complete conversion, including a new fixed staircase, will cost from £15,000 for a basic room-in-roof conversion, and above £20,000 for a dormer conversion (up to £45,000 if you’re adding a bedroom with en suite facilities). If your conversion will involve significant roof alterations the cost will rise further. Speak to local estate agents to determine how much value a loft conversion will actually add.

(MORE: Loft Conversion Ideas)

Right to Light in a Terraced House

When extending a terraced house, which, by its very nature, will be close to its neighbours, and particularly when considering a two storey extension, their ‘right to light’ will need to be taken into consideration. Although not specifically a planning issue, there is an ancient law dating all the way back to 1832 that still protects homeowners’ right to light.

What this means is that if you decide to build something that will substantially block light from a neighbour’s window, then the neighbour can take legal action against you for infringing on their right to light — providing their window has been there for at least 20 years. They could seek to have your proposed development reduced in size, or try to obtain a payment in lieu of reducing their right to light.

The right to light is not actually a material consideration in planning decisions and if the loss of light is fairly insignificant and can be compensated for financially, the court may award compensation rather than an injunction.