Mansard Loft Conversions

All You Need to Know

Mansard loft conversions often require more construction work than other types of loft conversions, but can result in creating a significantly larger living space in your home, regardless of property type. Here, we provide answers to some of the most commonly asked questions about mansard loft conversions.

Is Planning Permission Required for Mansard Loft Conversions?

Planning permission is almost always required for this type of extension. These conversions create maximum living space within your roof by effectively creating another storey to your property. As this results in changes to the roof shape and structure, it is highly likely that planning permission will be needed from your local authority.

What Types of Houses are Best for Mansard Conversions?

Mansard roofs are particularly common in London and other urban areas and can often be seen across whole rows of older terraced properties. Although not regularly seen in suburban areas – flat roof dormers are typically cheaper and simpler to construct – mansard roofs are actually suitable for almost all types of properties. Detached, semi-detached and terraced houses, as well as chalets and bungalows, can all typically house mansard loft conversions.

In terms of aesthetics, the external walls of a mansard extension can be exposed brickwork, rendered or clad with slate or tile whichever best fits with your property.

Pros and Cons of Mansard Loft Conversions

To summarise, some of the pros of mansard loft conversions include:
Creates maximum space in the roof of your existing property
Suitable for many different types of property
Can be finished in a number of ways to match the existing building style

Some of the cons include:

Planning permission is almost always required
Often more expensive when compared to other types of conversion
Requires considerable amount of construction work
APT Renovation are pleased to be able to offer you an inclusive service, drawing of plans and subsequent submitting of plans right through to the actual build and decoration.

If you would like any advice on which Loft Conversion is best suited to your home, please contact our helpful office team who will be happy to arrange a meeting with you.

Loft Conversion Specialists

With a team of professionals who have more than 20 years of experience who will work around the clock to ensure that your property if performed to the highest standards whilst causing minimum disruption

Dedicated Project Manager

Our project managers have many years of experience and hold all professional qualifications in construction industry. We work efficiently and with consideration for your neighbours and environment.

Memberships & Insurance

As a London’s leading Loft conversion specialist we are fully registered and trained with the most reliable construction authorities and insured to comlpy with all government and environmental requirements.


A Building Inspector will visit at regular stages throughout the project, their job is to make sure that we are adhering to all the latest building regulations. Upon completion of works The Building Inspector will make a final visit and you will be issued with a completion certificate.


Planning Permission

APT Renovation have a Central and South West London focus and are always well abreast of the developments in local planning permission guidance and building control. We are also familiar with the property types and architectural profile of this region meaning that the design work we undertake will be sensitive and well applied to your property. Obtaining planning permission for your property conversion need not be an arduous affair for our clients as we will undertake all such necessities. Our staff are excellent communicators and always adhere to proven project management best practices to ensure an exemplary finish.

Building Control

We provide Building Control approval specialist services for all types of residential projects. Our swift and responsive technical expertise means that we are able to viable and safe buildings. We are here to assist you with all Building Regulation process, however our expertise in all aspects of the property industry gives us a unique approach.
Our Building Control covers following:

Residential – Property re-modelling, house and kitchen extensions, loft conversions, basement conversion, and internal alterations.
New homes – Flats, bungalows, houses and barn conversions.

Our comprehensive approach to building control delivers a professional, speedy and simple service across all sectors.

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