Professional Loft Conversions In London

Our professional team of expert craftsmen are committed to constructing bespoke living spaces that mirror your unique taste and lifestyle.

We Are London's Loft Conversion Experts!

Stress-Free Loft Conversions In London

Are you looking for a team of professional builders in London to help you with your building project?

As one of London’s finest building companies, The Ratio provides high-standard building services that meet your needs. We have what it takes to ensure that your building project is carried out to the highest quality with the most superior finishes.

What’s behind our success is a skilled team of professional builders. We have decades of experience in the construction industry.  We work hard to deliver the warm and welcoming home that you’ve always dreamt of.

Make your life easier by letting us handle everything from beginning to end. This will allow us to track the entire process and complete the project on time.

Contact The Ratio’s professional new builds London team if you want to build a new home in London and need the right team for the job. You can reach us by calling 020 3897 0775.

Why Choose The Ratio Design & Build For Your Loft Conversion?

We pride ourselves on being one of the finest London loft conversion specialists. in London. We offer an entirely professional service, keeping you updated every step of the way whilst we completely transform your home.

By choosing to have your loft conversion carried out by us, you can rest assured knowing your loft-conversion project is in safe hands. Right from the initial site study to completion, we have got you covered every step of the way.

We specialise in all types of loft conversions, whether it is a dormer loft conversion, mansard loft conversion or any other type, we have you covered!

Not only do we provide you with the best loft conversions in London, but we also offer the most competitive prices too!

For a free non-obligation quote, give us a call at 020 3897 0775 or fill out the contact form below.

Loft conversion in London by The Ratio

Why A Loft Conversion Is A Great Idea For Your Home!

Grow Your Home With Your Family

A loft conversion allows your home to grow with your family.

A well-designed loft conversion can add up to 30 to 50% living space to your home, without compromising your precious London garden space.

Add Value to Your Home

With London’s current uncertain property market, now is the time to improve rather than move.

Loft conversions can add up to 20% value to your property. A properly executed loft conversion project can generate a considerable return on your investment.

Capitalise on the extra square footage with a new bathroom, bedroom or office space and enhance your home’s value.

An Energy Efficient Investment

Attics and roofs are prime spots for energy loss in your home. A loft conversion is the perfect opportunity to make your home eco-friendly and boost your energy efficiency.

Taking careful consideration of insulation, double glazing, heating and lighting will convert your renovation investment into a money-saving and planet-friendly project. 

Transform Your Home in No Time

In 2019, the government overhauled planning permission laws, meaning many loft conversions now fall under permitted development rights. Without the lengthy process of obtaining planning permission, we could have your loft conversion project completed much sooner than you might expect!

The Ratio’s Bespoke and Comprehensive Service

With our 20+ years experience in undertaking comprehensive home improvement projects, we can convert your unused attic into a luxurious living space. We will advise you on all aspects including planning permission, energy efficiency and maximising your home’s value to deliver a smooth and all-inclusive service.

We Are London's Loft Conversion Experts

Our in-house expert design team are mindful of your needs for functionality, timescale and costs. They will work with you all the way from initial consultation to completion of construction to deliver a 100% bespoke service that works around you and your family.

Contact us today to begin the process of converting your loft and perfecting your family home to a superior standard with a bespoke design package and painless process.

A bathroom in a converted loft

Types Of Loft Conversions

A loft conversion with a roof terrace can be an excellent way to increase living space and property value. Converting a loft usually entails, adding a new staircase to access the space as well as reinforcing the floor to support the extra weight. It may also include the installation of windows and skylights to allow in natural light, as well as insulation to keep the space warm and comfortable.

Once the basic conversion is finished adding a roof terrace can take the space to the next level. A roof terrace is a deck or patio area built on a building’s roof that provides a private outdoor space with stunning views. It can be the ideal place to unwind and relax, as well as to entertain friends and family.


The first step in creating a roof terrace is to consult with one of our structural engineers at The Ratio, this is to ensure that the roof can support the additional weight. We may need to reinforce the roof by installing support beams. Once the structure is sound, materials such as decking boards, railings, and a waterproof membrane to protect the roof beneath can be used to construct the roof terrace.

A roof terrace can provide additional insulation for the home, which is one of its advantages. A roof terrace can help to keep the space below cooler in the summer and warmer in the winter by acting as a barrier between the hot summer sun and the roof. This can lower energy costs while also making the space more comfortable to live in.


Another benefit of a roof terrace is the opportunity for outdoor living. A roof terrace can become an extension of your living space, with plenty of space for furniture, plants, and even a barbecue or outdoor kitchen. It can be an ideal spot for a morning coffee or a beautiful sunset view.

Ultimately, a loft conversion with a roof terrace can be an excellent method to convert a dark and underutilised space into a light, airy, and multipurpose living space. A loft conversion with a roof terrace may add value, comfort, and enjoyment to your home, whether you want to construct an extra bedroom, home office, or entertainment space.

Key points about these types of conversions:

  • They require planning permission.
  • This makes them dependant on the leniency of local planners.
  • They are appearing more and more in luxury developments across London and the UK.


If you are considering a loft conversion with a roof terrace in London, give the experts at The Ratio Design & Build a call. Our experienced and friendly staff will give you a free consultation to determine if this is the right type of conversion for you.

  • A dormer loft conversion is an extension to the existing roof that projects vertically from a sloping roof, creating additional floor space and headroom within the property.
  • Internally it has vertical walls and horizontal ceilings. 
  • Extremely common loft conversion.
  • Can often be constructed without planning permission.

A Mansard loft conversion is a type of home renovation project that involves converting an attic or upper floor into a usable room to add more living space to a property. This style of conversion is named after the 17th-century architect François Mansart, who popularised the design.

François Mansart (also spelled Mansard) was a French architect credited with introducing classicism into the Baroque architecture of France. The Encyclopedia Britannica cites him as the most accomplished of 17th-century French architects whose works “are renowned for their high degree of refinement, subtlety, and elegance”.

The distinctive feature of a mansard roof is the steep slope on all four sides, with the upper slope being almost vertical and the lower slope being gentler. This type of roofing gives the newly created living space plenty of headroom and natural light, making it a popular choice for homeowners looking to add more space to their homes without undergoing a costly and time-consuming extension project.

One of the primary advantages of a Mansard loft conversion is that it does not require planning permission. This is because the conversion is considered a “permitted development” as long as certain criteria are met. The conversion must not extend beyond the existing roofline of the house and must not protrude above the highest part of the existing roof in order to qualify as a permitted development.

Another advantage of a Mansard loft conversion is that it can significantly increase the value of a home. Homeowners can increase the overall square footage of their home by adding more living space, making it more appealing to potential buyers.

Also, a great thing about Mansard loft conversions is that they can be customised to suit the specific needs of the homeowner. For example, the additional space created by the conversion can be used as a home office, a guest bedroom, or even a home gym.

There are several important factors to consider when designing a Mansard loft conversion. To begin with, it is essential to ensure that the new roof matches the style of the existing property. This will help to maintain the home’s overall aesthetic and keep it from looking out of place.
Furthermore, the placement of the new windows should be carefully planned to provide the maximum amount of natural light and ventilation.

Key Points About Mansard Loft Conversions:

  • They are an extension to the existing roof that projects vertically from a sloping roof, creating additional floor space and headroom within the property.
  • Internally they have vertical walls and horizontal ceilings.
  • Extremely common loft conversion.
  • Can often be constructed without planning permission.


If you are considering a mansard loft conversion in London, give the experts at The Ratio Design & Build a call. Our experienced and friendly staff will give you a free consultation to determine if this is the right type of conversion for you.

  • Is named after the 17th-century French Architect Francois Mansard.
  • Is situated to the rear of the property.
  • This conversion has a flat roof with a back wall sloping inwards at 72 degrees.
  • These conversions often require planning permissions.
  • Is  similar to a normal mansard (a flat roof, with the back wall sloping inwards and windows housed within small dormers) but also with a mansard to the front.
  • Also known as velux loft conversions due to the velux being the leading brand of roof windows.
  • The roofline is unaltered as the windows are installed fitting right into the roofline leaving the roofs structure untouched.
  • Planning permission is not normally required.
  • It is generally an attractive option due to the cost effective nature of the fitting.
  • A full back addition is where we not only build a loft over the main part of the house but also over the back addition if available.
  • A full back addition allows you to almost replicate your first floor in terms of space and design giving you the possibility for even three or four new rooms. 
  • No other loft conversion can maximise your space in this way.
  • A pod room is the room that is built out usually over half of the back addition giving a room approximately 3m *3.5m in size.
  • The space is often used as a spare bedroom, home office or even large luxury bathroom as the size is sufficient for a small double, large single, large office, playroom or even nursery.
  • This type of conversion involves changing the sloping side of the property to a flat gable end.
  • This increases the size of the loft space, often creating extra space for the staircase. Planning permissions may well be required as you alter the outline of the roof.

The Ratio’s Bespoke and Comprehensive Service

With our 20+ years of experience in undertaking comprehensive home improvement projects, we can delivery any type of building work.

We will advise you on all aspects including planning permission, energy efficiency, and maximising your home’s value to deliver a smooth and all-inclusive service.

Without A Doubt, We Are The Best Choice For Loft Conversions In London!

When it comes to loft conversions, we excel in every aspect. We are dedicated specialists who consistently deliver outstanding results for our clients. We boast a team of highly skilled and experienced professionals, that place customer satisfaction at the heart of everything we do. If you’re eager to learn more about our loft conversion services, don’t hesitate to reach out to us on 020 3897 0775. Our friendly team members are here to assist you with any inquiries or to discuss your loft conversion project in detail.

Successfully Renovated over 250+ Homes

"Highly recommend these guys as they gave us the dream house that we wanted."

Andrew Brown

"Use this company a few times for different jobs. Always got the job done on time and very professional!"

Nayim Mahomade

"The Ratio Design and Build team have given us a beautiful new kitchen and garden, with a professional, sleek and high-quality finish. Their attention to detail and workmanship throughout the project has been excellent, with immaculate skill and expertise. We are incredibly happy with the end result and would highly recommend this team for both large and smaller projects."

Roxane Feerick

"Best quality builds in London by far, professional service, I recommend them for anyone looking to fit a new bathroom or kitchen."

Oskar Kennedy

"Excellent quality work with great customer service, providing expert advice and very accommodating to changes and ad-hoc requests from our side."

Sheryl Smith

Frequently Asked Questions
For Our Loft Conversion Service

A loft conversion, also known as an attic conversion, is converting an empty attic or loft space into a functioning room, often utilized as a bedroom, office space, gym, or storage space. Because of its various perceived benefits, loft conversions are one of the most popular types of home remodelling techniques.

Loft conversions have different types that are not limited:

  • Roof Window
  • Conversion
  • Dormer Conversion
  • Mansard Loft
  • Conversion
  • Hip-to-gable Loft Conversion
  • Hipped-roof Conversion
  • Gambrel Conversion
  • Velux Loft Conversion

As long as they do not violate planning or conservation rules, nearly all lofts or attics can be transformed. However, it also depends on the height of the loft. You must have a loft with a minimum height of 2.2 meters in order to convert your loft. Even though the height requirement in loft conversions has been modified, it is doubtful that there will be usable headroom clearance if the loft is less than 2.2 meters.

Luckily, most of the loft conversions do not require planning permission. This is due to the fact that they often come under Permitted Development Rights. If your loft conversion does not match the government’s criteria, you will need to apply for planning permission.

The best place for a staircase to land is along the roof ridge: this maximizes the usable height above the stairs.

In reality, the location of your loft conversion stairs will be determined by the layout of the floor below, and if necessary, the available height can be increased by installing dormer windows or adding a roof light above the staircase.

Many homeowners prefer to add a bathroom in their loft conversion — and it is definitely recommended if you intend to locate a bedroom up there. 

This is something that is definitely possible and something we will take care of for you.

The complexity depends on the property however it is simple to add hot and cold water supplies by branching off the existing plumbing system, either at the boiler or from the floor below.

Dormer loft conversions include converting a pitched roof into a box-shaped building with walls that sit at a 90-degree angle to the floor. This increases the amount of room in your loft, making it more liveable.

There are numerous varieties of dormer loft conversions, and the best one for your home will depend on the style of the house, whether it is terraced, semi-detached, or detached, and the form of your existing roof.

When estimating how long a loft conversion will take, keep in mind that no two conversions are the same. Loft conversion styles and property types may vary in how long a conversion takes. Loft conversions may be completed in as little as four weeks or as long as eight weeks on average, with certain types being less complicated than others. Here are the many loft conversion types, along with a general time estimate:

  • Roof light conversions typically take four weeks.
  • Dormer conversions take an average of 5 weeks.
  • Hip-to-gable conversions take an average of 6 weeks.
  • Mansard conversions or complete roof replacements typically take 7-8 weeks.


However, we are able to provide you with more accurate details when you contact us through the form or by calling us at 020 3897 0775


Contact us to get a free non-obligation quote from London’s loft conversion specialists.