How much does a Loft Conversion in North London Cost (2025)
- Alex Hudgell
- Jul 25
- 5 min read
Updated: Aug 27
Thinking about gaining more space without the hassle of moving? A loft conversion could be the perfect solution. In North London, where space is often at a premium, converting your loft is one of the smartest ways to increase your living area and boost your property's value by up to 20 percent.
Whether you're looking into a rear dormer, a gable extension, or a simple eaves design, it's important to understand the costs involved and what you can expect from the process.
Average Cost
In North London, loft conversions typically range from £45,000 to £90,000, depending on the type of conversion and the complexity of the work.
The most common options include Dormer, Gable, Eaves and L-Shaped conversions. Each has its own features, planning considerations and price range.
Value Addition
A well-planned and professionally executed loft conversion can add up to 20 percent to your property’s value, making it a cost-effective way to invest in your home.
Factors Influencing Cost
Several factors affect the total cost, including the size of the loft, the complexity of the design, materials used, and whether any structural reinforcements are needed.
Average Costs of Loft Conversions in North London
Loft conversion prices vary depending on the type of work required. Here is a breakdown of typical costs for different types of conversions:
Type of Loft Conversion | Average Cost | Key Benefits |
Dormer Loft Conversion | £50,000 – £65,000 | Ideal for creating one large or two single bedrooms plus a bathroom |
Gable Loft Conversion | £60,000 – £80,000 | Increases internal space by altering the roof structure, suits hip end roofs |
Eaves Loft Conversion | £45,000 – £55,000 | Great for a single bedroom, office, or gym; minimal structural changes required |
L-Shaped Loft Conversion | £65,000 – £90,000 | Maximises space, perfect for period homes; often fits two bedrooms and a bathroom |
Important Notes:
Prices can vary depending on the quality of materials, labour rates and additional features such as en-suite bathrooms or bespoke windows.
If your property is located in a conservation area, planning permission may be necessary.
Source: Bigger Living Lofts
How the Size of a Loft Conversion Affects the Price
The size of the space being converted is one of the biggest cost factors. Larger lofts require more materials and labour, which leads to higher costs.
For example:
A 20m² loft could cost between £50,000 and £70,000, depending on the type of conversion and finishes selected.
A smaller 13m² space might range from £35,000 to £45,000.
Source: MyJobQuote
If you’re considering a loft conversion, choosing the right type is crucial
Here is a closer look at the four main types of loft conversions available in North London:
Dormer Loft Conversion
A dormer conversion is a popular choice as it extends vertically from the existing roof, providing added floor space and full headroom. It is suitable for semi-detached and terraced homes and is perfect for creating a large bedroom, office or en-suite.
Cost: £50,000 – £65,000
Planning permission: Usually not required under lawful development unless your property is a flat or located in a conservation area
Gable Loft Conversion
This involves extending the side wall of your property to create a vertical gable end. The result is increased usable loft space and a layout that mirrors a rear dormer. It is ideal for homes with sloping roofs on the side.
Cost: £60,000 – £80,000
Planning permission: Usually not required under lawful development unless your property is a flat or in a conservation area
Eaves Loft Conversion
An eaves conversion uses the existing loft space without major alterations to the roofline. It’s a more straightforward option that works well for smaller rooms or home offices.
Cost: £45,000 – £55,000
Planning permission: Usually not required under lawful development unless your property is a flat or in a conservation area
L-Shaped Loft Conversion
An L-shaped conversion extends the roof in two directions, forming an “L” shape, typically at the rear. This is especially effective for Victorian and Edwardian properties with rear extensions, providing ample space for multiple rooms.
Cost: £65,000 – £90,000
Planning permission: Usually not required under lawful development unless your property is a flat or in a conservation area
Source: Checkatrade
Frequently Asked Questions About Loft Conversion Costs
Are loft conversions worth the money? Yes. A loft conversion can add up to 20 percent to your home’s value, making it one of the most effective ways to increase space and investment returns.
Which loft conversion is the most affordable? An eaves loft conversion is usually the cheapest option, costing between £45,000 and £55,000, as it requires fewer structural changes.
Which loft conversion gives the most space? An L-shaped loft conversion provides the most usable space. It suits period properties and allows for multiple rooms such as bedrooms, offices, or bathrooms.
Do I need planning permission for my loft conversion?
Dormer & Eaves Conversions: Usually do not need planning permission under permitted development
Gable & L-Shaped Conversions: May require planning permission, particularly if they involve major alterations to the roof or exceed permitted development limits
How long does a loft conversion take?
Dormer & Eaves: Typically completed in 5 to 6 weeks
Gable & L-Shaped: Usually take 6 to 8 weeks due to additional structural work
Can I live in my home during a loft conversion? Yes. Most of the work is carried out via external scaffolding, which limits disruption inside your home. The main impact only occurs when the staircase is installed.
Next Steps: Planning Your Loft Conversion
Sunlight Lofts is here to guide you through the entire process, from initial ideas to completed transformation.
Here’s how to get started:
1. Assess Feasibility Make sure your loft has sufficient headroom and structural integrity for a conversion.
2. Set a Budget Decide how much you’re comfortable spending and request detailed quotes from trusted specialists.
3. Design and Planning Work with experienced designers to create a tailored plan that meets your needs and complies with building regulations.
4. Party Wall Agreement If your property shares a wall with a neighbour, you may need a Party Wall Agreement to proceed legally and avoid disputes.
5. Obtain Permissions Apply for any required planning permission or ensure your project falls within permitted development.
6. Select a Contractor Choose a company with a solid track record in North London loft conversions. Look for transparency in pricing, strong reviews and design expertise.
Ready to explore the potential of your loft? Book a free consultation with Sunlight Lofts today. Our team of experts will provide clear advice, transparent costs, and a tailored plan to transform your loft into a beautiful and functional part of your home.
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