Loft conversions: choosing a contractor

A loft conversion can make unused space into a practical room, but it is not just another building job. The right builder will help you check if your loft is suitable, guide you through permissions, and make sure the work meets regulations. Knowing what to ask and compare puts you in control from the first enquiry to the final handover.

Know the main types of loft conversion

Before you speak to builders, it helps to know the main types of loft conversion. Each type suits different roofs and budgets, and the method can affect permissions and structural work. You do not need to decide on your own, but discussing the options early will help builders understand what is possible:

• Rooflight (Velux) conversion: This is the simplest form, adding roof windows to let in light without altering the roofline. It usually involves the least disruption.
• Dormer conversion: A box-shaped extension is built out from the roof, adding extra headroom and floor space. Dormers can be added to the rear, side or front, subject to planning rules.
• Hip-to-gable conversion: The sloping side (hip) of a hipped roof is built up to form a vertical wall (gable), creating more usable space. This is common on semi-detached or end-terrace houses.
• Mansard conversion: The most extensive type, with a new roof shape that has a flat top and steep sides. Mansards are often used on terraced houses and typically need planning permission.

When you contact builders, mention what you know about your roof type and whether you want a bedroom, study, or bathroom. This helps them advise on what conversions are likely to work for your home. If you are unsure, a builder or an architect can assess your loft and discuss the options in more detail.

Check feasibility: what makes a loft suitable?

Not every loft is easy or practical to convert. Builders will need to visit and measure, but you can ask about the main factors that affect feasibility:

• Head height: Most conversions need a minimum headroom at the highest point. Ask builders what height they recommend and how they measure it. If space is tight, see if they have experience with lowering ceilings or raising the roof.
• Staircase position: Fitting stairs into the existing layout is one of the biggest challenges. Ask where the stairs would go and how much existing space they will take up. A good builder will explain the options and any compromises.
• Structural support: The new room will need extra joists or steels to support the floor and roof. Ask how they assess the existing structure and what work is usually required. Builders should explain how they minimise disruption on lower floors.
• Fire safety and escape routes: Building Regulations require safe routes from the loft to an exit. Ask how fire safety is handled, including whether fire doors or escape windows are needed. Builders should be able to describe recent projects and how they met the rules.

Bring up these points during your first call or visit. A builder who answers clearly and can point to similar projects is often better prepared for the job.

Specialist loft companies versus general builders

You will find both specialist loft conversion firms and general builders listing loft conversions on Annuvell Local. Each type has different strengths, and it is worth asking both about their experience:

• Specialist loft companies often have in-house designers or structural engineers and can handle the project from design to completion. Ask what services are included, who will manage permissions, and whether they use their own staff or subcontractors. Check how many conversions they do each year and if you can see photos of completed jobs.
• General builders may offer loft conversions as one of several services. Ask how many similar projects they have completed and whether they work with regular architects or engineers. Check if they are familiar with the specific rules for lofts and can arrange the necessary drawings and calculations.

For both types, ask about insurance, references and how they handle any surprises uncovered once work starts. A builder who has converted lofts in your style of house will be able to explain the process and flag any likely issues. You can compare businesses that list loft conversions as a service on Annuvell Local, and use the compare tool to see which have stated or verified experience.

For more about builder checks, see Finding a reputable builder for an extension or renovation.

Permissions and regulations to discuss with builders

Loft conversions are subject to several permissions and regulations. A reputable builder will explain which apply to your project and guide you through the process, but you should ask specific questions:

• Permitted development limits: Many loft conversions in England do not need full planning permission if they stay within certain size and design limits. However, some homes (such as flats, listed buildings or those in conservation areas) may not qualify. Ask whether your property is likely to need planning permission and whether they will check with the local authority.
• Building Regulations: All loft conversions require Building Regulations approval. Ask who will handle the application, arrange inspections and provide the final completion certificate. Regulations cover structure, fire safety, stairs and insulation, so check that the quote includes all compliance work.
• Party walls: If your house shares a wall with a neighbour, the Party Wall Act may apply. Ask if a party wall agreement is needed and who will be responsible for notices and negotiations.
• Fire doors and escape routes: Regulations often require fire doors on the stairs and escape windows in bedrooms. Ask how they will meet fire safety rules and what will be changed in the rest of the house.

Getting clear answers early avoids costly changes later. If anything is unclear, check with your local planning authority or consider asking an architect.

What to look for in a loft conversion quote

Comparing quotes for a loft conversion is not just about the bottom line. Builders include and exclude different things, so check each item carefully and ask for written details. Some points to check:

• What is included: Most quotes should include all major structural work, stairs, insulation, windows, electrics and basic plastering. Check if the builder includes organising Building Regulations inspections and certificates.
• What is excluded or optional: Decoration (such as painting), flooring, bathroom fitting, and built-in storage are commonly left out or listed as extras. Make sure the quote states whether these are included or itemised separately.
• Bathrooms and plumbing: If you want a bathroom, check whether plumbing, tiling and sanitaryware are part of the quote. Some builders only do the shell, leaving bathroom fit-out to specialists.
• Contingency and changes: Ask how extra costs will be handled if the work uncovers unforeseen issues, such as poor roof timbers or the need for extra steelwork.
• Payment schedule: Check when and how payments are due, and whether any deposit is requested up front. Avoid paying large sums before work starts.

Write down what each builder includes, so you can compare like with like. For more detail, see What should be included in a building quote?.

Consumer rights and contracts for loft conversions

Even with a straightforward project, a clear contract protects both you and the builder. Some consumer points to be aware of:

• Consumer Rights Act 2015: Any building service must be carried out with reasonable care and skill, within a reasonable time, and for a reasonable price if no total was agreed. If the finished conversion is not as described, you may have rights to ask for a fix or a reduction.
• Cooling-off period: If you agree a contract at home, by phone or online, you normally have 14 days to change your mind. If the builder is asked to start urgently within this period, you may still be charged for any work carried out.

Ask for a written contract that sets out what is included, payment terms, timescales, and how changes or delays will be handled. Clarify how you can raise concerns if anything is not as agreed.

Next steps

List what you want from your loft conversion, including any preferred type and features. Write down your questions about feasibility, permissions and what is included. Then find builders near you who list loft conversions and use Annuvell Local’s compare tool to check their experience, request quotes, and see how their answers match your needs. Bringing clear notes to each conversation helps you choose the right contractor for your project.