We tip our hats to Francois Mansard, the 17th Century French architect who conceived this conversion design. It is one of the most extensive loft conversion types capable of producing multiple rooms. Although the alteration is more intricate than a dormer loft conversion, the final result is a satisfying revamp. The extension spans across the entire plane of a pitched roof by changing the slope of your roof to an almost vertical wall. The wall slopes inwards at an angle of 72 degrees allowing drainage of rainwater. Mansard loft conversions are generally located to the rear of the property and have a flat roof. Front mansards are also available. The windows housed in small roof dormers are an impressive aesthetic feature and enable more natural light.
You can choose exposed brickwork, rendered, or clad with slate and tiles for the exterior finish. By matching these to the existing exterior of your home, the new addition becomes seamless. With similar fascias, soffits, gutters, and windows, the fixtures, too, can resemble the original. Balconies are a great addition to this loft conversion.
Almost always, yes. These require planning permission as more dramatic modifications to the shape and structure of the house are involved. But keep your mind at ease, because we at Good Design & Build apply for planning permission on your behalf. Our team is well-versed with the planning guidelines in London, and our designs meticulously adhere to those requisites. We also offer assistance with party wall agreements.
It is suitable for detached, semi-detached, and even terraced houses. Original Victorian properties will hugely benefit from a mansard conversion due to its appearance. You will need party wall agreements from neighbours when dual party walls are involved in the proposed structural change.
It is one of the best additional space creating approaches for a London home. You get to maximise floor space and headroom significantly.
This type of addition can increase the value of your property by 20%.
The versatile finish means you can use your creativity and match the design to the existing architectural style of your home.
It is a suitable style for many homes, especially in cities, due to its pleasing appearance.
You don’t have to move or spend a fortune on a bigger London home.
Almost always planning permission is a principal requirement.
It is more expensive than hip to gable conversion or a dormer loft conversion.
Substantial building work is needed. We provide a fulltime project manager from the start to the very last minute, so you have no reason to worry about the work involved.
Don’t hold back your imagination; think big with the extra floor space. It can be a bedroom with an en suite bathroom, two bedrooms, a guest bedroom, a large bathroom, a playroom for the children, workspace, an art studio, a library with a sitting area, and more.
A Mansard conversion can cost £1,500 – £2,500 per square metre. The entire cost depends on the size of your home, design features, fixtures inside, and other additions. We let you know upfront the total estimated cost on our free site visit. Our builders and engineers always source quality products for fair prices, and the finish will not only look elegant but also built to last. Convert your loft for the most stylish and beneficial expansion your home can gain.
Our process is simple and divided into two distinct phases with separate contracts: Design and Build. As a client you only commit to one phase at a time depending on what stage of the process you are in. Each phase consists of three stages as described below.
This is the kick-off point for your project. We carry out a complete architectural measured survey of the property. This allows us to create accurate CAD design drawings. This is followed by a design meeting to start discussing your ideas in more detail.
At this stage we finalise the designs with you and start preparing planning applications as needed. We place a high priority on ensuring that plans, designs and schedules are all based on a thorough and detailed understanding of planning guidelines. We co-ordinate with local authorities until the decision is made, and the planning approval is secured.
Once the planning consent is secured, we translate the design drawings into more detailed technical drawings for the purposes of building control and construction. This also includes specifications and structural calculations. At this stage, we will also submit to you our ‘no obligation’ quote for the build phase.
90% of our clients decide to stick with us after the design phase is completed. Once the build contract is signed, we kick off the process by making sure all the pre-build processes are complete. These include assistance with party wall agreements, Thames Water build over agreement, submitting building control application, and preparing method statements etc as needed. This stage ends with a pre-start meeting with your foreman before the actual build begins.
One of our foremen will be dedicated to your project and will be on-site to manage everyday works. Our project managers will be overseeing the works to make sure they are completed to high standards, within your budget and on time. Throughout the process we will keep you updated with the progress and coordinate the works with third parties such as kitchen or flooring suppliers. We will also advise and guide you to choose any suppliers if needed.
As the build draws to finish, we will help to iron out any ‘snags’ to make sure everything is completed to your satisfaction. We will put together all necessary certificates such as gas, electricity and building control completion along with warranties for glazing, boiler etc. At the final completion meeting, we will hand you these documents, together with the keys to your house. Needless to say, you can contact us any time after this, if you want us to look at something.
This is the kick-off point for your project. We carry out a complete architectural measured survey of the property. This allows us to create accurate CAD design drawings. This is followed by a design meeting to start discussing your ideas in more detail.
At this stage we finalise the designs with you and start preparing planning applications as needed. We place a high priority on ensuring that plans, designs and schedules are all based on a thorough and detailed understanding of planning guidelines. We co-ordinate with local authorities until the decision is made, and the planning approval is secured.
Once the planning consent is secured, we translate the design drawings into more detailed technical drawings for the purposes of building control and construction. This also includes specifications and structural calculations. At this stage, we will also submit to you our ‘no obligation’ quote for the build phase.
90% of our clients decide to stick with us after the design phase is completed. Once the build contract is signed, we kick off the process by making sure all the pre-build processes are complete. These include assistance with party wall agreements, Thames Water build over agreement, submitting building control application, and preparing method statements etc as needed. This stage ends with a pre-start meeting with your foreman before the actual build begins.
One of our foremen will be dedicated to your project and will be on-site to manage everyday works. Our project managers will be overseeing the works to make sure they are completed to high standards, within your budget and on time. Throughout the process we will keep you updated with the progress and coordinate the works with third parties such as kitchen or flooring suppliers. We will also advise and guide you to choose any suppliers if needed.
As the build draws to finish, we will help to iron out any ‘snags’ to make sure everything is completed to your satisfaction. We will put together all necessary certificates such as gas, electricity and building control completion along with warranties for glazing, boiler etc. At the final completion meeting, we will hand you these documents, together with the keys to your house. Needless to say, you can contact us any time after this, if you want us to look at something.
“Thank you to Amol and his entire team for delivering us a fantastic extension to our newly purchased home. The guys were friendly and very professional during all stages”
Lisa
Twickenham TW2
“Originally, we’d planned on this being a property to rent out to others. Since the loft conversion, we’ve fallen back in love with the place – and have now decided to move back here.”
George Banks
Richmond TW10
“I would like to thank GDB for all of their hard work, ideas and inspiration and for being so approachable and easy to deal with during the our rear extension. I would happily recommend them to anyone thinking of starting a building project”
Debra
Mortlake SW14
“My wife and I would like to say a huge thank you to all the team at Good Design & Build. From the planning stage all the way through to completion they were meticulous with their design and helping us achieve our vision of our dream family home. We were supported all the way through, even when we wanted to make significant structural changes during the build. We are over the moon with the results achieved and quality of the building work and finishing is excellent. THANK YOU GOOD DESIGN & BUILD!!”
Xerxes Dalal
Potters Bar EN6
“Good Design provided the architectural services as well as building work. It was great to have both bundled into one. They were very flexible and great to work with - nothing was too much trouble. I would highly recommend them.”
Louise Murray
Twickenham TW1
“We thoroughly enjoyed working with Amol and the Good Design & Build team on our recent house extension. We've been so happy with how the team helped design, plan and deliver the extension. Always very patient and informative of how the process will run, the team did a fantastic job and we're delighted with the results. The biggest compliment I can give them is that I'd happily work with Amol and the team again :).”
Benjamin Hammond
Twickenham TW11
Sellons Ave NW10 4HJ
The project included creating a master bedroom in the loft with an adjoining terrace.
Learn more
Orbain Road SW6 7JZ
This project was completed in 2023 and the approximate budget was £101,000.
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Hetherington Road SW4
We completed this stunning project for our client Angus in Lambeth.
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Station Road SW4 7PA
We completed this exciting project for our clients on Station Road, a quaint residential area in the heart of Teddington.
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Windsor Road E10
We completed this kitchen extension on Windsor Road, a charming residential street nestled in the heart of Leyton.
Learn more
Sellons Ave NW10 4HJ
The project included creating a master bedroom in the loft with an adjoining terrace.
Learn more
Orbain Road SW6 7JZ
This project was completed in 2023 and the approximate budget was £101,000.
Learn more
Hetherington Road SW4
We completed this stunning project for our client Angus in Lambeth.
Learn more
Station Road SW4 7PA
We completed this exciting project for our clients on Station Road, a quaint residential area in the heart of Teddington.
Learn more
Windsor Road E10
We completed this kitchen extension on Windsor Road, a charming residential street nestled in the heart of Leyton.
Learn more
Let's get started with building your own bespoke quote for your dream extension. Tell us as much in detail as possible to get most accurate price.
Get StartedLet's get started with building your own bespoke quote for your dream extension. Tell us as much in detail as possible to get most accurate price.
Get Started