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Loft Conversion Cost London and Hertfordshire United Kingdom

Updated: Mar 17

If you are considering adding a loft conversion on your home in the near future you are most likely wondering what the cost of a loft conversion is in 2024 going onto year 2025 and year 2026. This article will discuss the costs, benefits, design ideas and planning rules relating to a loft conversion. Whilst costs can be influenced by many different factors here we will take a look at what you could expect to pay for the various different types of loft conversion in 2024. With 3d illustrations of how the loft conversions might look, costs associated and useful links to other topics to consider for your loft conversion project as well as recently completed projects. Use our loft conversion instant cost calculator to find out the cost for dormer loft, hip to gable loft, mansard loft or velux loft.



What is the cost of a loft conversion in 2024?


The average cost of a Loft Conversion in London in 2024 is between £49,000 to £90,000. The most frequently built type of loft conversion in London remains the Dormer Loft Conversion. Typically homeowners are choosing to add a new master bedroom suite in their loft. The master bedroom suite, in most cases on a three bedroom home, comprises of a large bedroom with bespoke built in storage, a beauty desk area or home office space and an en-suite bathroom. Where space permits some renovators are choosing to use part of the loft bedroom space to build a separate walk in wardrobe area. You can expect to spend £2100-£2500 per square metre for newly built additional space on a London home. Many loft conversions built in London are built within the permitted development allowance and therefore do not require planning permission. This allows the homeowner to add 40 cubic metres of additional space to a terraced house or 50 cubic metres to a detached or semi-detached subject to certain conditions being met on houses that meet the prescribed criteria.

To talk to us about your loft conversion project book a free consultation phone call now.


Want to get an idea of the cost right now for a loft conversion on terraced house, end of terrace, semi-detached or detached house, whether it is dormer loft, hip to gable loft, L shaped loft, mansard loft or velux loft? Why not use our instant cost calculator for loft conversions including architecture design cost and construction cost.



What type of loft conversion is suitable for my home?


One of the important factors to determine when thinking about the cost of your loft conversion is to understand what type of loft conversion would be best suited to your home. This may be influenced by the existing structure of your property or by planning rules for loft conversions. At LCCL Construction we can help you to design and build a loft conversion that is suitable for your home and makes the best use the available space. Book online to speak to one of our experienced consultants now about your project.


Unsure of what type of loft conversion would suit your property? You will gain an understanding of different types of design and build loft conversions projects in 3d view such as dormer loft conversion, hip to gable loft conversion, l shaped loft conversion, mansard loft conversion or velux loft conversion.


Dormer loft conversion with a bedroom and en-suite.

Estimated cost: from - £49,000.00

Optional Extras:

  • Skylights, Velux Windows, Side Windows

  • Bi-fold doors or French Doors with Balustrades

  • Change Front Roof Tiles, Gutters and Fascia

  • Floor finishing in carpet or wood, Oak Stairs

  • Combi System Upgrade or Consumer Units, Plumbing and Electrical Upgrades

  • Bathroom Supply and Install




Hip to Gable Loft Conversion with a double bedroom and en-suite.

Estimated cost: from - £53,000.00

Optional Extras:

  • Skylights, Velux Windows, Side Windows

  • Bi-fold doors or French Doors with Balustrades

  • Change Front Roof Tiles, Gutters and Fascia

  • Floor finishing in carpet or wood, Oak Stairs

  • Combi System Upgrade or Consumer Units, Plumbing and Electrical Upgrades

  • Bathroom Supply and Install



L Shape Loft Conversion with large bedroom or two bedroom and en-suite.

Estimated cost: from - £60,000.00

Optional Extras:

  • Skylights, Velux Windows, Side Windows

  • Bi-fold doors or French Doors with Balustrades

  • Change Front Roof Tiles, Gutters and Fascia

  • Floor finishing in carpet or wood, Oak Stairs

  • Combi System Upgrade or Consumer Units, Plumbing and Electrical Upgrades

  • Bathroom Supply and Install



Mansard Loft Conversion with large bedroom or two bedroom and en-suite.

Estimated cost: from - £70,000.00

Optional Extras:

  • Skylights, Velux Windows, Side Windows

  • Bi-fold doors or French Doors with Balustrades

  • Change Front Roof Tiles, Gutters and Fascia

  • Floor finishing in carpet or wood, Oak Stairs

  • Combi System Upgrade or Consumer Units, Plumbing and Electrical Upgrades

  • Bathroom Supply and Install


Velux Loft Conversion with Bedroom.

Estimated cost: from - £39,000.00

Optional Extras:

  • Velux Windows, Side Windows

  • Change Front and Rear Roof Tiles, Gutters and Fascia

  • Floor finishing in carpet or wood, Oak Stairs

  • Combi System Upgrade or Consumer Units, Plumbing and Electrical Upgrades

  • Bathroom Supply and Install








What is the cost of a 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 structural 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

Email: info@lcclconstruction.co.uk


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


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? dormer loft conversion guide








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. Hip to gable loft conversion guide







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. Mansard loft conversion guide
















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. L shape loft conversions guide








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