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L shaped loft conversions everything you need to know

Updated: Jan 29

An L shaped loft conversion is absolutely ideal for period properties with a back addition as you can also extend up the top of the back addition to get loads more space. Effectively, you are putting another floor on the back addition which was unheard of a decade or so when they were converting these type of properties.

L shaped loft conversions everything you need to know
L shaped loft conversions everything you need to know

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Above video is presentation of L shaped loft conversion before and after of a project that LCCL Construction design and build, you can find out more about this project on the following link from start to finish including approved designs by LCCL Construction

What is a L shaped loft conversion?

An L-shaped conversion involves an L-shaped dormer window. Dormers are the roof windows which extend vertically from the slope of a roof. With L-shaped loft conversions, two dormers connect into a corner. One end of the dormer, usually the larger end. is built into the main roof.

L Shaped Loft Conversion
L Shaped Loft Conversion

Benefits of L-shaped loft conversion

The primary advantage of a l shaped conversion is the extra space that it creates. You would have amazing new space for a separate double room and separate bathroom and separate landing, they generally have a lot of space and storage.

Do L shaped loft conversions require planning permission?

The major benefits of adding a L shaped loft conversion is that they fall under permitted development rights. These rights do allow you to extend your house without the need of planning permission as long strict planning permission guidelines are followed. We do however recommend lawfulness certificates are obtained from planning meaning that you will hold an official document that your development is legal. Some L shaped loft conversions may require full planning application.

For example, you will not qualify for permitted development if:

  • The height of your dormer exceeds that of the original roof.

  • You live in a listed building or conservation area.

  • Bats live inside your loft. As a protected species, you need a special license to disturb their home.

  • Your neighbours are affected by your dormer through overlooking or overshadowing.

  • Your dormer exceeds 40 meters on a terrace house, or 50 meters on a semi-detached house or detached house.

  • Your dormer features a balcony - but Juliet balconies are fine.

  • The materials used by your dormer are out of character with the rest of your house.

If your project does falls within the permitted development, it should be made sure that the application to planning is made for Lawful Development Certificate. This will eliminate any legal issues and also helps on future sales of the house.

Is my house suitable for a L shaped loft conversion?

L-shaped loft conversions extend over the rear extension that exists in many Victorian and Edwardian Houses. Ideal for Victorian and Edwardian terraced properties where there is a back addition at the rear – usually housing the kitchen in the ground floor and a bathroom above. It means that you have a little bit more area to build over, and can achieve a larger loft conversion.

L shaped loft conversions Building Regulations

Building regulations are the vital part of all loft conversions. All the loft conversions must be compliant with building regulation standards and every step of the construction of the loft conversion must be checked by Local Authority Building Control and signed off.

To be compliant with building regulations you will need to pass on each one of these categories:

  • Headroom

  • Insulation

  • Fire Safety

  • Electrical

  • Stairs and Stairs Design

  • Sound Proofing

  • Structural

these are just a few...

What is the cost of the loft conversion and house extension?

You can use our "instant quote calculator" and find out the cost in seconds! for both design and build, architecture services or just construction services depend what stage you are in and what you have so far completed.

We have experience of over 15 years in design and construction of loft conversions and home extensions in London and Hertfordshire areas and have worked out a unique calculation formula that you can find out to what your house extension and loft conversion will cost in seconds.

How can Lccl Construction be of help?

Do you require a loft conversion and house extension to add extra space?

Then look no further get in touch with us for a detailed free no obligation quote. We can accommodate a very quick turnaround. Our loft conversions and house extensions come with 10 year guarantee and 12 month workmanship guarantee.

Use our instant quote calculator for a quote about your project whether construction only or design and build.

Use our Free consultation call booking system to schedule a call at the time and date that suits you best.

Telephone: 020 8037 7332


More related types of loft conversions and everything you need to know about them:

Dormer loft conversion

Dormer Loft Conversion
Dormer loft conversion

The most popular and most talked about type of loft is "Dormer Loft Conversion". So what is a dormer loft conversion? is it right for your home?

Hip to gable loft conversion

Hip to gable loft conversion
Hip to gable loft conversion

A Hip to Gable loft conversion is very popular on semi-detached & detached properties with sloping roofs, which is essentially a roof with a sloping side in addition to the slopes at the front and back.

Mansard loft conversion

Mansard Loft Conversion
Mansard Loft Conversion

A mansard loft conversion, named after the 17th-century French Architect Francois Mansard, is situated to the rear of the property. This type of conversion has a flat roof, with the back wall sloping inwards at an angle of 72 degrees.

L shaped loft conversion

L Shaped Loft Conversion
L Shaped Loft Conversion

An L shaped loft conversion is absolutely ideal for period properties with a back addition as you can also extend up the top of the back addition to get loads more space.


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