The cost of a Loft Conversion: What You Need to Know

Converting your loft can be an excellent way to add space, value, and functionality to your home. However, the cost varies depending on the size of your property, the type of conversion, and the complexity of the build. Typically, loft conversions range from £65,000 to £90,000.

Loft Conversion Costs

Mid-Terrace Three-Bedroom Property

For a standard loft conversion with a rear-facing dormer and Velux windows to the front roof slope, you can expect to pay around £65,000.

Semi-Detached or End-of-Terrace Property

If your property requires a hip-to-gable roof alteration in addition to a dormer and Velux windows, costs typically range between £70,000 and £80,000.

Detached Property

For a detached property, creating a full usable roof space usually requires a hip-to-gable roof alteration on both sides. Under permitted development guidelines, you are limited to 50 cubic metres of additional roof volume outside the current roof structure.

Due to these alterations, the size of dormers may be limited. For a detached property, loft conversion costs generally reach around £90,000.

Choosing a Builder for your loft conversion

At Fluent Architectural Design Services LTD, we can introduce you to specialist loft conversion companies or trusted local builders:

• Specialist loft conversion companies: Typically charge 10–15% more, but projects are usually completed faster due to their expertise.

• Local building companies: May be more cost-effective, but timelines can vary.

Planning and Building Control Costs

Before starting your loft conversion, there are additional fees to consider:

• Permitted Development Certificate of Lawfulness: £103

• Householder Planning Application: £206

Building control fees:

• Local authority building control: Approximately £500 plus VAT

• Independent inspection companies: Slightly higher fees

We can obtain quotations on your behalf and explain all available options.

Cost per Square Metre

• Loft conversion within existing roof structure with Velux windows: £1,400–£1,700 per m²

• Flat roof dormer loft conversion: £1,500–£1,800 per m²

How Much Should You Spend?

When considering a loft conversion, it’s important to balance your dream space with the property’s value:

• Compare your current property value and the expected loft conversion cost to the highest property value in your area.

• Consider the costs of moving and stamp duty, which can exceed the cost of extending your home.

Useful websites for comparing property values include Rightmove, Zoopla, and Onthemarket. For a more detailed valuation, consult local estate agents who have extensive knowledge of your area.

If your loft conversion is part of creating your forever home, you may be less concerned about the ceiling values in your road, as property prices typically rise over time. Most clients, however, want to ensure their investment in a loft conversion is reflected in the increased property value.

Ready to Transform Your Loft?

At Fluent Architectural Design Services, we provide a full-service solution, from planning and design to introductions to specialist builders. Get in touch today to discuss your loft conversion and receive a detailed quotation