Loft Conversions London


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A loft conversion is the process of transforming an underutilized attic space in a house into a functional living space. This involves converting the attic area into a fully habitable room, which can serve as a bedroom, office, gym, or any other type of living space.

The conversion process usually involves structural work, such as adding additional support beams or strengthening the floor, as well as insulation, plumbing, and electrical work. The loft conversion may also require the installation of a staircase to improve access and a skylight to bring natural light into the space.

The benefits of a loft conversion include increasing the usable living space of a house without the need for an extension or relocation, adding value to the property, and providing a new space for a growing family or for those who work from home. Additionally, converting an attic into a living space can often be a more cost-effective solution than moving to a larger house.

However, it is important to note that not all houses are suitable for loft conversions, and building regulations must be followed to ensure that the space is safe and meets the necessary requirements for habitable living. It is recommended to consult with a our loft conversion builders to determine the feasibility and cost of a loft conversion for your specific home.

Interested in Loft Conversions? Contact Us Today


Over the years we have carried out hundreds of home renovation projects, especially loft conversions in London.

We are proud of every project we work on to turn disused spaces into beautiful rooms for our clients and families.

In London loft conversions are popular, where space is at a premium and still a family city, more space is often required.

Perhaps you want that spare bedroom for guests, a home office or want to develop your property for sale or rent.

Whatever you’re looking to do with your attic conversion in London, Clapham Construction Service has already done it for someone else and we can do it for you too.

Remember these are fully completed and decorated, to give you an idea of space, quality, and possible finish, but every house is unique and so is every building service we provide.


Loft Conversion Complete Process

We manage the design and build for you, planning permission, structural design, building control and your project manager will be on your site almost daily to oversee the works and keep you updated.

Quality Craftsmanship

Our works are warrantied, but they will stand much monger than that. We are builders primarily and our teams are experts with quality on our mind – you will get weekly inspections by the owner to ensure we deliver.

10 – Year Warranty On All Loft Conversions

Exactly what it says. We provide you with a warranty to cover you and your home for any defect from our works so you don’t have to worry. In addition you get an independent certificate by the regulators confirming that our works meet the approved building standards.

Attic Conversions Add Value

Getting A loft or attic conversion with us can add up to 25% to the value of your home, making it one the best investments you can make.

Interested in an Attic Conversion? Contact Us Today


In London no two properties are alike and neither are their owners. The same can be said of the lofts in London, however having built hundreds, we at Clapham Construction Service, understand a thing or two about them. Though the finish may be different for every client the structure follows a few set designs.

We have laid them out for you here to gain a better understanding. During the free home consultation we will help you choose the right one for you and your home.


There are many different types of conversion that can be built on your property and we have all the information you need right here. From mansard conversions to dormer conversions, there’s something for everyone! Whether it’s an extra bedroom or a place for guests to stay when they visit, our team will work with you every step of the way so that you get exactly what you want from your new space. We offer free consultations and estimates so why not give us a call today? You won’t regret it!

View Our Design and Build Process

Check out the work of our amazing teams and
what we can achieve in your home

Want some friendly advice?

Contact Us For Advice On Attic Conversions

Our clients love us, because we provide honest and straightforward information and advice, no sales pitch, no hassle! We are trusted because we aim to satisfy all of our clients as being the best loft conversion company london, not just build a job for profit. Only by being open and honest from the start, right up to the finish, can we make sure everyone is happy. We try to keep to South London, and we have carried out loft conversions from Wimbledon to Dartford.  If you want to get some information or want some advice about a loft conversion in London, just give us a call or drop a line. You can check out our loft conversion guide for more information on loft conversions.

Want A Loft Extension? Contact Us Today


New build houses, detached houses, semi-detached houses, and terraced houses are all eligible for a loft conversion, as long as they have a pitched roof with enough headroom and space for a staircase.

  • New build houses are often designed with the potential for a loft conversion in mind, and may already have the necessary structural support in place.
  • Detached houses, semi-detached houses, and terraced houses are also commonly converted, as they often have a pitched roof and enough space for a staircase.

However, the suitability of these houses for a loft conversion will depend on the specific design of the house and the amount of headroom and space available in the attic. A professional assessment by Clapham Construction may be needed to determine the suitability of these types of houses for a loft conversion.


New Build Houses

Read on to find out more about how new build houses can benefit from a professionally designed and executed loft conversion, adding valuable space and increasing the overall value of the property.

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Detached Houses

Find out more about the potential of detached houses and how a well-planned and executed loft conversion can transform them into spacious and functional living spaces.

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Semi-Detached Houses

Semi-detached houses offer great potential for a well-designed loft conversion, Read our guide on semi-detached loft conversions here.

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Terraced Houses

A terraced house loft conversion can provide many benefits beyond just added space and increased value. It can also improve the overall functionality and layout of the house.

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Interested in a Loft Conversion? Contact Us Today


There are many different types of rooms that you can convert your loft into, depending on your needs and preferences. Some popular options include bedrooms, bathrooms, home offices, playrooms, and even home gyms.

You can also turn your loft into a multi-purpose space that can be used for a variety of activities, such as a living room, dining room, or even a home theatre. Additionally, many people choose to convert their lofts into guest rooms, which can be a great way to provide extra space for visitors or renters.

Whatever type of room you choose to convert your loft into, Clapham Construction ensures that the space is properly insulated, ventilated, and finished to meet your specific needs and preferences.


Loft Office

Office loft conversions are typically bright, spacious, and filled with natural light, providing a comfortable and productive work environment. Read here for all information on loft offices.

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Loft Bedrooms

Loft conversion bedrooms are often cosy, private retreats, with slanted ceilings and skylights that create a unique and charming atmosphere perfect for a peaceful night’s sleep.

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We operate across the whole of South London and can build lofts in the locations listed below.

Speak to Our Team About Loft Conversions in London


What are the different types of loft conversion?

The most common types of loft conversion are Skylight Conversions, Two Window Dormer, Dormer Conversion, Hip to Gable & Rear Dormer, Hip to Gable, L – Shaped Mansard, L – Shape Dormer, Mansard Conversion

Do you need planning permission for a loft conversion?

Generally speaking, you can build a loft conversion under permitted developments, however, if you own a listed building or property in designated areas the laws are different.

How much value does a loft conversion add?

Loft conversions can add up to 25% value to your home depending on how much space you add.

Are there laws around stairs for loft conversions?

If you are planning to install stairs for your loft conversion there are certain rules and regulations, that have to be followed.


Loft Planning Permission

Read our guide on planning permission for lofts in London which includes information about party wall agreements.

Loft Conversion Stairs

Depending on what type of property you have will determine the type of stairs you have in your loft conversion.

Loft Conversion Costs

There are a variety of options when it comes to your loft conversion you can read our guide on loft conversion costs.

Loft Conversion New Builds

If you have recently moved into a new build property you can still get a loft conversion, read our handy guide.

Is A Loft Conversion for me?

For those considering a loft conversion, one of the prime inquiries is typically: Is my loft suitable for transformation?

Although not all roofs can accommodate a loft conversion, some might necessitate additional structural modifications or a specific type of loft conversion to satisfy the standards.

The main considerations as to your home’s suitability for a loft conversion are:

  • Accessible headroom
  • The roofs pitch
  • The roof structure
  • Impediments like water tanks and chimney stacks

For loft conversions, the tried-and-true framed type roof structures are often your best bet to open up a space quickly and cost effectively. In homes built prior to 1960, rafters typically line the edges of a traditional roof, leaving plenty of room in between. The rafters may require reinforcement or an extra layer of support (our expert structural engineer can guide you through the process).

Trussed roofs boast ‘W’ shaped rafters that not only provide reliable roofing, but also support the floor structure. Converting trussed roofs may be a bit more demanding, but it is far from impossible. By replacing the ‘W’ shaped rafters with an ‘A’ shape structure, you can create a hollow space and transform your roof from its current form to something truly extraordinary. To ensure the new floor joists and rafters are supported, we typically install steel beams between load bearing walls, as well as one at the ridge.

When planning to make your loft conversion dreams a reality, consider that if there is not sufficient roof space for water tanks and plumbing, it may be necessary to replace the heating and hot water system with a sealed version.

Making the switch to an unvented hot water cylinder is a better decision than replacing your boiler with a combi one, though you will need to find both the space and funding necessary for it. An unvented cylinder requires its own cupboard-sized room in order to function properly.

What is the minimum height for a loft conversion?

The building Regulations do not cover the minimal head height requirement for a loft conversion, but ideally, you should have at least 2.2m of available space to make it feasible. Calculate the height of your loft by measuring from the bottom of the ridge timber in its centre to the top of the ceiling joist.

Roof pitch angles are directly correlated to the central head height of a room; when dormers or roof redesigns are used, both floor area and comfortable headroom can be substantially increased.

Even if the initial assessment of your roof space reveals it’s less than 2.2m tall, a loft conversion is still possible! The solution could be as simple as adding a mansard roof or replacing the current structure with something else entirely. Don’t let height limit you from achieving that extra living-space – explore all possibilities and bring your dream to life!

Do loft conversions need planning permission?

Don’t worry if you are not sure whether you need planning permission for your loft conversion, a lot of the time, it’s covered by Permitted Development (PD) rights.

Nevertheless, you’ll need to make sure that your design adheres stringently to a few key parameters. The most important of these include:

  • It is essential that the property has not already taken advantage of its Permitted Development rights to extend an extra storey.
  • To maintain the existing aesthetics, any new roof space added to terraced houses must not exceed 40 cubic metres and for all other buildings should be restricted to 50 cubic metres.
  • When completing a loft conversion, it is essential to adhere to the height of the existing roof in order for your planning permission application (PD rights) to be accepted.
  • Moreover, the existing roof slope on the facade of the house (fronting a highway) must not be exceeded.Verandas and balconies with raised platforms are not allowed under Permitted Development, but Juliet balconies are.

Unless the work falls under Permitted Development, which is usually not true with loft conversions such as mansard ones, you will have to submit an application for planning permission. Moreover, in certain designated locales like conservation areas or Areas of Outstanding Natural Beauty that are highly protected, a request must be made before any sort of loft conversion can take place.

Before you begin a loft conversion, it’s essential to confirm that Permitted Development is still available in your area. Even if the work does fall under Permitted Development regulations, applying for a Lawful Development Certificate makes sense and is essential if you plan on selling your home soon.

Loft Planning Permission Guide

Is a building regulations approval mandatory for loft conversions?

Loft conversions always require Building Regulations approval. A building control surveyor will visit your site to inspect the conversion progress and issue a completion certificate when it is finished. The primary components of interest, Parts L, K, B and P of the Building Regulations should be taken into consideration for this type of endeavour.

  • Part L of the building regulations imposes U-value targets for thermal efficiency that must be fulfilled if you wish to turn your loft into a living space.
  • According to Part K of the building regulations, preventative measures must be taken against falls and collisions. This entails making sure that all escape routes have a minimum headroom of 2 metres – this rule is slightly less strict for staircases leading up to attic conversions.
  • Meeting the Building Regulations standards for fire and electrical safety, as addressed in Parts B and P respectively, can be a complex process.

What are the fire safety rules concerning loft conversions?

When you’re completing a loft conversion, not only are fire doors typically required, but there are additional fire safety requirements as mandated by the building regulations. Make sure your new windows can provide an adequate escape route—they must be of sufficient size and low enough to use in case of emergency!

  • All first-floor habitable rooms require egress window openings, excluding bathrooms.
  • All openings should have a minimum dimension of 450mm x 450mm, creating an area no smaller than 0.33m2.
  • When installing skylights, be sure to place the bottom of their opening no lower than 800mm and no higher than 1,100mm from the floor.

For bungalow loft conversions, the following regulations generally apply. But if you plan to transform a two-storey home into a three-story abode with your conversion, pay attention to these additional rules as well:

  • Windows that are situated higher than 4.5 meters from the ground cannot be used as an escape route. Therefore, building regulations compel owners to construct a fortified stairwell leading all the way down to the final external door – ensuring swift and safe evacuation in case of an emergency.
  • If you’re looking to install a staircase that rises from within your home, then there are two options available: either enclose the stairs into an enclosed hallway with an external door or create a lobby at its base. The lobby walls and doors must be fire-resistant, preferably opening outwards and offering viable exit choices in case of emergency. As long as those requirements are met, even inward-opening doors will suffice.
  • When a staircase lands in an open plan space, such as that of a house with an open floor plan, the best course of action may be to install a sprinkler system.

To ensure maximum safety, your loft conversion requires floor joists with a minimum of 30 minutes of fire protection. This may necessitate replastering the ceilings in the first-floor rooms below it. Additionally, to comply with regulations and guarantee further security, your new loft must include an appropriate fire door at either the top or bottom of its stairs.

Update your stairwell existing doors to ensure 20 minutes of fire resistance, or replace them altogether. Keep in mind that glazing isn’t an option unless you opt for fire-rated glass; consider installing windows or rooflights instead to bring natural light into the staircase.

To ensure maximum safety in your home, it is highly recommended that you install smoke alarms on each floor of the house and interconnect them so when one goes off, they all go off. Most mains-powered alarms come with a rechargeable battery as backup to make sure power supply is maintained–even if hardwiring from lighting circuit becomes necessary. If wiring isn’t an option for your ground floor ceiling, wireless radio-linked alarms are available for installation too.

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