Add a bedroom, bathroom, or home office without the cost and disruption of moving. FirQuote connects you with qualified loft conversion specialists who visit your property and give a proper, costed quote.
Get Free Loft Conversion QuotesBefore you speak to a builder, here is what every homeowner should understand about loft conversions.
Most loft conversions fall under permitted development and do not require planning permission, provided they stay within volume limits. However, properties in conservation areas or those that have already used their permitted development allowance will need an application.
Costs vary considerably depending on the type of conversion and the size and pitch of your existing roof. A basic Velux conversion typically starts from around £20,000–£30,000, while a full dormer or hip-to-gable conversion can cost £40,000–£70,000 or more.
The type of loft conversion that works for your home depends on your roof structure, head height, and what you want to use the space for. A specialist surveying your property in person is the only reliable way to know what is achievable.
A typical loft conversion takes between 6 and 12 weeks from work starting on site, depending on the complexity. Dormer and mansard conversions generally take longer than simpler Velux conversions.
Not all loft conversions are the same, and the right type for your home depends on a number of factors that only become clear once a specialist has assessed the property in person. That said, understanding the main options is a useful starting point.
A Velux or rooflight conversion is the simplest and most affordable option. It does not change the shape of the roof at all — instead, windows are installed into the existing roofline to bring in light and ventilation. This works well where there is already sufficient head height, typically 2.2 metres or more at the ridge.
A dormer conversion extends the roof outward to create a box-shaped structure with vertical walls and a flat or pitched roof. This is the most common type in the UK and significantly increases the usable floor space and head height. They can be built to the rear, side, or front of a property.
All loft conversions, regardless of whether planning permission is required, must comply with Building Regulations. These cover structural integrity, fire safety, insulation, and means of escape. Your builder should manage the Building Regulations application process, and a building control officer will inspect the work at key stages.
Structurally, most loft conversions require the existing floor joists to be strengthened to carry the new load. Party walls in terraced or semi-detached properties may require a Party Wall Agreement with neighbouring owners before work can begin. A good loft conversion specialist will advise you on all of this before quoting.
Loft conversions are significant building works and choosing the right tradesperson matters. Look for someone who carries full public liability and employers' liability insurance, who can provide references from recent similar projects, and who manages the Building Regulations process rather than leaving it to you. A written, itemised quote that includes all elements of the work — structural, roofing, joinery, electrical, and plastering — is the mark of a professional who knows what they are doing.
Be cautious of very low quotes that do not itemise the work. The most expensive quote is not always the best, but the cheapest rarely is either. Comparing three properly costed quotes from specialists who have visited your property gives you the clearest picture of fair market pricing for your specific job.
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