How Much Does a Typical Loft Conversion Cost in the UK?

Loft Conversion Cost UK - Plans 2 Extend

Loft conversions have become an increasingly popular way for homeowners in the UK to add extra space and value to their properties. Whether you need an additional bedroom, a home office, or a playroom for the kids, converting your loft can be a cost-effective solution compared to moving house. But how much does a typical loft conversion cost in the UK? In this blog post, we’ll break down the various factors that influence loft conversion costs and provide you with an estimated range.

Loft Conversion Cost UK - Plans 2 Extend

Factors Influencing Loft Conversion Costs

Type of Loft Conversion

The type of loft conversion you choose will significantly impact the overall cost. Here are some common types:

  • Roof Light/Velux Conversion: This is usually the cheapest option as it involves minimal structural alterations. The cost typically ranges from £15,000 to £25,000.
  • Dormer Loft Conversion: Adding a dormer window can increase headroom and usable space. This type of conversion usually costs between £30,000 and £50,000.
  • Hip-to-Gable Loft Conversion: Ideal for semi-detached or detached houses with hipped roofs. Costs range from £40,000 to £65,000.
  • Mansard Loft Conversion: The most expensive option but offers maximum space. Expect to pay between £45,000 and £70,000.

Size of the Loft

The size of your loft will also affect the overall cost. Larger spaces require more materials and labour, which will drive up expenses.

Structural Changes

If your existing roof structure needs significant alterations or reinforcements to support a new room, this will add to your costs. For example:

  • Steel Beams: These may be required for structural support and can add several thousand pounds to your budget.
  • Floor Reinforcement: Strengthening floors is often necessary and can also increase costs.

Quality of Materials

The quality of materials you choose for insulation, windows, flooring, and other elements will influence your final bill. Higher-end finishes will naturally be more expensive but can add significant value to your home.

Labour Costs

Labour costs vary depending on where you live in the UK. London and South East England generally have higher rates compared to other regions.

Additional Costs To Consider

Planning Permission & Building Regulations

While many loft conversions fall under permitted development rights (meaning no planning permission is required), some may still need approval from local authorities. Additionally, all conversions must comply with building regulations which ensure safety standards are met.

  • Planning Permission: If required could cost around £200 – £500.
  • Building Regulations Approval: Typically around £400 – £800.

Planning Drawing Fees

Hiring a designer can help ensure that your loft conversion is both functional and aesthetically pleasing. Technician fees generally range from £1,000-£2,000.

Interior Finishing

Don’t forget about interior finishing such as plastering walls, painting, installing lighting fixtures etc., which can add another few thousand pounds depending on your choices.

Cost Breakdown Example

To give you a clearer picture let’s consider an example:

  1. You opt for a Dormer Loft Conversion
  2. Your house is located near Manchester
  3. You choose mid-range materials
  4. No major structural changes needed apart from standard floor reinforcement

Here’s how it might break down:

ItemEstimated Cost
Dormer Construction£30k -£35k
Windows & Insulation£3k -£5k
Floor Reinforcement£2k -£4k
Interior Finishing£5k -£8k
Planning Technician Fees (Including all structural reports etc)£3k -£4k

Total Estimated Cost = Around £43K – 56K


A typical loft conversion in the UK can vary widely based on several factors including type of conversion chosen, size, quality of materials used among others. On average though homeowners should expect spend anywhere between 20K upwards towards even exceeding beyond 70K depending upon specific requirements. It’s always advisable get multiple quotes compare them before making final decision. Not only does adding extra living space enhance lifestyle but also adds considerable value property making worthwhile investment long term.

So if considering expanding upwards instead outwards remember do thorough research plan carefully ensure smooth hassle-free experience transforming unused attic into beautiful functional living area!

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