How Much Does a Loft Conversion Cost in the UK?

How Much Does a Loft Conversion Cost in the UK?

Thinking about adding extra space to your home? A loft conversion is a fantastic way to boost your property’s value and create a new bedroom, office, or playroom—without moving. But how much does a loft conversion cost in the UK? At Colombo Builders, we’ve been transforming homes across Essex, London, and Kent since 2008, and we’re here to break it down for you. Costs vary based on the type of conversion, your location, and specific requirements. Whether you’re in Romford, Chelmsford, or Dartford, understanding the price range can help you plan. In this guide, we’ll explore the main types of loft conversions—Velux, dormer, hip-to-gable, and mansard—and give you a clear idea of what to expect. Ready to unlock your loft’s potential? Let’s dive into the costs and options!

Types of Loft Conversions and Their Costs

Velux Loft Conversion (Rooflight Conversion)

• Description: The simplest and most affordable option, a Velux loft conversion adds skylights (Velux windows) to your existing roof without altering its structure. Perfect for lofts with decent headroom.

• Cost Range: £20,000–£30,000

• Details: Ideal for homes in Essex like Chelmsford, where planning rules are strict. Costs cover insulation, flooring, stairs, and windows. Add £1,000–£3,000 for electrics or plumbing if you want a bathroom.

• Why Choose It?: Quick to install, often no planning permission needed—great for budget-conscious homeowners in London or Kent.

  
  

2. Dormer Loft Conversion

• Description: A dormer extends the roof vertically, adding headspace and floor area. It’s popular for its versatility and extra light via flat or pitched dormer windows.

• Cost Range: £35,000–£50,000

• Details: Common in London homes (e.g., Camden or Croydon) needing more usable space. Costs include structural work, roofing, and finishing. In Kent’s Dartford, prices might lean higher due to labour rates.

• Why Choose It?: Balances cost and space—perfect for a master bedroom or office in Essex or Kent.

3. Hip-to-Gable Loft Conversion

• Description: This transforms a sloped "hipped" roof into a vertical "gable" end, maximizing space. Often paired with a dormer for even more room.

• Cost Range: £45,000–£60,000

• Details: Suited to semi-detached or detached homes in Essex (e.g., Basildon) or Kent (e.g., Maidstone). Costs reflect complex structural changes, new roofing, and finishes. Add £5,000+ for bespoke features.

• Why Choose It?: Ideal for larger families needing multiple rooms—popular in London’s suburbs.

  
  

4. Mansard Loft Conversion

• Description: The most extensive option, a mansard alters the entire roof into a near-vertical slope with a flat top. It maximizes space but requires significant work.

• Cost Range: £50,000–£70,000+

• Details: Often seen in London’s terraced homes (e.g., Croydon) due to planning flexibility. Costs include major structural changes, new roofing, and premium finishes. In Essex or Kent, expect slight variations based on local rates.

• Why Choose It?: Offers the most space—think ensuite bedrooms or full flats.

Factors Affecting Loft Conversion Costs

• Location: Labour and material costs are higher in London (e.g., £200–£250/day) than in Essex or Kent (£180–£220/day).

• Size & Complexity: A 20m² loft costs less than a 40m² one with dormers or plumbing.

• Finishes: Basic plasterboard is cheaper than luxury fittings (e.g., oak stairs add £2,000+).

• Planning Permission: Most conversions fall under Permitted Development, but mansards or listed homes in Essex might need approval (£200–£500).

Why Invest in a Loft Conversion?

In the UK, loft conversions can increase your home’s value by 15–20%, according to 2025 trends. For a £300,000 home in Romford, that’s £45,000–£60,000 added—often offsetting the cost. Plus, you get usable space without the hassle of moving. At Colombo Builders, we’ve seen homeowners in Kent and London turn lofts into rental rooms, earning £500–£1,000/month. It’s a smart investment!

Get Your Loft Conversion Quote Today

Loft conversion costs in the UK depend on your vision and property, but with Colombo Builders, you’re in expert hands. Serving Essex, London, and Kent since 2008, we offer free, no-obligation quotes tailored to your needs. Whether it’s a Velux in Chelmsford or a mansard in Croydon, our family-run team delivers quality at competitive prices. Call us at 07776016495 or email info@colombobuilders.co.uk to start planning your loft conversion today!