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Loft conversion cost London: what you need to know

Updated: Apr 8

When searching for loft conversion cost London, you first need to know the type of loft conversion you're having done. The type of loft conversion you opt for depends on the roof structure, building regulations and your requirements. You can have a simple Velux loft conversion or a more complex hip-to-gable loft conversion.

The cost of a loft conversion is difficult to determine because of the variations in house type and required work. Loft conversions can range anywhere from £50,000 to £100,000+.

Let's look at the costs of converting your loft space by going through the process of a loft conversion.

Loft Conversion Consultation

At this stage, you don't have to commit to anything, as companies will provide quotes free of charge.

Specialised loft conversion companies will visit your house to assess the height of the space and the structure of the roof. They will also listen to your ideas. You will discover what is and isn't feasible, like creating a master bedroom and ensuite in the loft. Afterwards, they will give you an estimated cost for the conversion.

To ensure accurate quotes, get all costs in writing to avoid unexpected surprises during the process.

Design of Your Loft Conversion

Choose a company that can do the type of loft conversions you want and has a proven track record. Have a browse at their portfolio of loft conversion projects and read their reviews before committing to anything.

During the design process, designers will work with you to map out your ideas and create a new loft space, infused with style and functionality.

The elements that influence cost at the design stage are things like materials used, structural requirements and finishes. If you’re dreaming of an ultra-modern loft, you can expect to allocate more funds to high-quality materials and finishes, for a luxurious result.

Loft Conversion Planning Permission

Not all lofts require planning permission. In fact, many loft conversions can go ahead under Permitted Development Rights, without the need for permission. If planning permission is needed, a small fee is required to submit the application.

Compared to the cost of the rest of the build, this fee is not something you need to worry about.

The Construction Process

To convert a loft space, common steps include adding joists, changing the roof, insulating, and installing a staircase.

A substantial part of the costs will go towards construction. With a reliable construction company, you'll know the budget for this project before any construction work begins.

Decorating and Furnishing Your Loft Space

Decorating and furnishing your loft space is an exciting opportunity to showcase your creativity. Whether you want to kit it out with a four-poster bed or create a modest office space, the choice is yours. This means that you can spend as much or as little as you want, and always upgrade the interior finishes at a later date.

Miscellaneous Expenses

A trusty project manager will explain that sometimes they cannot avoid unexpected delays or extra costs. This is the case for a number of building projects and isn’t because companies want to take advantage.

For example, contractors might only discover rotting roof timbers once construction has begun. A few other examples are outdated wiring or hidden water damage.


Reputable companies that provide loft conversions will offer a warranty on their work and materials. This warranty ensures that if any issues arise, the company will assist you and fix the problem at no additional cost.

On a final note: a loft conversion adds to the value of your home.

Loft conversions can increase the value of your home and are an attractive selling point. This is because they create additional space in the house. Added to this, some homeowners might use the additional loft space for rental purposes. Finally, converting your loft can meet the need for home offices as more people work from home.

Are you ready to start your loft conversion journey?

If you're looking for a loft conversion company in London, try Canyon Design and Build.

We are a London-based design and build company that covers the entire project lifecycle, from design to building, project management, interior finishes and more.

We ensure our clients are comfortable throughout the process by handling and overseeing the entire building process ourselves.

When delving into a loft conversion with Canyon, expect layouts that prioritise space, ensuring every inch is utilised to its maximum potential. Our dedicated project manager and skilled craftsmen remain committed to translating your loft conversion aspirations into a vibrant, functional space.

If you’re ready to transform your home and lifestyle, choose Canyon – where visions become breathtaking realities.

Where should I begin?

Reach out for a free quote on our contact page. Simply fill in the form and we'll be in touch with a time and date when we can visit. We will need to get into your loft space to assess the conversion possibilities.

We look forward to hearing your vision for your London loft conversion.

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