Make Better Decisions Before You Build
Explore loft conversion types, planning considerations, costs and the services you may need before starting your project.
A loft conversion can be one of the most effective ways to create additional space without moving home. However, the right approach depends on the shape of the existing roof, the type of property, the available head height, the likely planning position and the way the new space will be used.
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APN Lofts brings together practical information to help homeowners understand the options before committing to a design or appointing contractors.
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Whether you are considering a simple rooflight conversion, a rear dormer, a hip-to-gable extension, an L-shaped dormer or a full mansard conversion, the aim is to help you move forward with a clearer understanding of the process.
Where Are You in Your Loft Conversion Journey?
Every loft conversion project begins at a different stage. You may still be exploring the possibilities, considering planning and design options, preparing to appoint contractors or looking for support with a project that is already underway. Start with the section that best reflects where you are now.
Exploring Your Options
Understand which loft conversion types may suit your property, how much space could be created and the practical issues to consider before committing to a design.
Planning and Design
Explore permitted development, planning permission, staircase layouts, roof alterations and the drawings needed to turn your ideas into a workable proposal.
Preparing to Build
Get ready for the construction stage with guidance on Building Regulations, structural design, insulation, fire safety, quotations and appointing the right professionals.
Project Already Underway
Find practical support if your loft conversion has already started or if you need help resolving drawings, approvals, technical questions or specialist services.
Explore Loft Conversion Types
The right loft conversion will depend on the shape of your roof, the type of property and the amount of space you hope to create. Explore the most common options below to understand which approach may be suitable for your home.
Dormer Loft Conversions
Create valuable extra headroom and floor space by extending out from the existing roof slope. A popular option for bedrooms, bathrooms and home offices.
Velux Loft Conversions
A simple and cost-effective way to create usable loft space while retaining the existing roof shape. Ideal where the roof already has sufficient height.
Hip-to-Gable Loft Conversions
Extend the sloping side of a hipped roof to form a new vertical gable wall. Particularly suitable for many semi-detached and end-of-terrace homes.
Mansard Loft Conversions
A substantial roof alteration designed to create a generous new upper floor. Mansard conversions can maximise space but often require planning permission.
Bungalow Loft Conversions
Transform the unused roof space above a bungalow into practical new accommodation. Often suitable for additional bedrooms, bathrooms or a flexible living area.
L-Shaped Loft Conversions
Extend over both the main roof and the rear addition to create a larger, more versatile loft. Commonly suited to Victorian and Edwardian properties.
Loft Conversion + Roof Terrace
Add valuable outdoor space at roof level alongside a loft conversion. Roof terraces can be attractive but usually need careful planning consideration.
Front Dormer Loft Conversions
Introduce additional headroom and natural light on the front roof slope. The design needs to complement the character of the property and surrounding street.
​​How Much Does a Loft Conversion Cost?
The cost of a loft conversion will depend on the type of property, the design approach, the amount of structural work required and the standard of internal finish.
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A simple Velux conversion may be relatively straightforward, while a dormer, hip-to-gable or mansard conversion will usually involve a larger budget. It is also important to allow for professional fees, structural design, Building Regulations, insulation, staircase construction, windows, bathrooms and internal finishes.
Bungalow Loft Conversion Costs
Bungalow loft costs vary widely because the work can range from a simple rooflight conversion to a major new upper floor. Staircase position, roof height and structural work are key cost factors.
Hip To Gable Loft Conversion Costs
A hip-to-gable conversion usually costs more than a simple dormer because the side roof is rebuilt to create more usable space. Best suited to semi-detached, detached and end-of-terrace homes with hipped roofs.
Mansard Loft Conversion Costs
Mansard conversions are usually one of the more expensive loft options because they involve major roof reconstruction. They can create excellent space but often need planning permission and detailed structural design.
Dormer Loft Conversion Cost
Dormer loft conversions are one of the most common ways to add usable space. Costs depend on dormer size, structure, staircase, fire-safety upgrades, insulation, windows and internal finish.
Is Your Loft Suitable for Conversion?
Not every roof offers the same opportunities. The available head height, roof pitch, existing structure, staircase position and relationship with neighbouring properties can all affect the most suitable design.
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Some lofts can be converted with relatively modest alterations. Others may need a dormer, hip-to-gable extension or more substantial roof redesign to create worthwhile accommodation.
Key Points
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Available head height and roof pitch
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Position of the staircase
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Roof structure and chimney breasts
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Terraced, semi-detached, detached or bungalow layout
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Conservation area or planning constraints
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Whether the loft is intended as a bedroom, office, bathroom or self-contained space
​​​Do You Need Planning Permission for a Loft Conversion?
Many loft conversions can be completed under permitted development rights, but this is not automatic. The planning position will depend on the type of property, the scale of the roof alterations, the location of the home and whether any restrictions apply.
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Front dormers, mansard conversions, roof terraces and properties in conservation areas often need closer consideration.
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Checking the position early can help you avoid delays and ensure that the design is developed on the right basis.
Professional Services for Loft Conversion Projects
A loft conversion may require input from several different professionals, from the early design stage through to construction and final approval.
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Depending on the type of project, you may need help with architectural drawings, structural calculations, Building Regulations, party wall matters, building control inspections and the construction work itself.
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Explore the services below to understand which specialists may be relevant to your project.
Popular Loft Conversion Guides
Planning a loft conversion involves several important decisions, from choosing the right type of conversion to understanding costs, approvals and the practical issues that can affect the design.
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Explore our most popular guides for clear, straightforward advice before moving forward with your project.
Professional Services for Loft Conversion Projects
Depending on the stage of your project, you may need help from several different specialists.
Loft Conversion Guidance Across London
The most suitable approach to a loft conversion can vary considerably depending on the style of property, the local streetscape and any planning restrictions that may apply.
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Victorian terraces, Edwardian semis, post-war homes, maisonettes and bungalows can each present different opportunities.
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Conservation areas, Article 4 directions and neighbouring roof alterations may also influence the design.
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Explore our local guides for practical advice relevant to homes across London and the surrounding areas.
Loft Conversions in Bromley
Practical guidance for semis, detached homes, bungalows and family properties across Bromley and the surrounding areas.
Loft Conversions in Greenwich
Explore loft-conversion options for period terraces, conservation-area properties and larger family homes.
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Loft Conversions in Dulwich
Advice for Victorian and Edwardian homes, including dormers, mansards and sensitive roof alterations.
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Loft Conversions in Ealing
Guidance for terraces, semis and larger period properties where roof shape and local character can affect the design.
Loft Conversions in Hammersmith
Explore loft-conversion opportunities for London terraces and period homes, including planning and conservation considerations.
Loft Conversions in Croydon
Advice for semis, detached properties, bungalows and homes with scope for hip-to-gable or dormer conversions.
Loft Conversions in Wandsworth
Practical guidance for Victorian terraces, Edwardian homes across Wandsworth, Putney, Balham, Tooting and Earlsfield.
Loft Conversions in Richmond
Advice for terraces, semis and detached homes across Richmond, Twickenham, Teddington and the surrounding areas.
Book a Loft Conversion Project Consultation
Not sure where to start, what approvals you need or which professionals should be involved? A short project consultation can help you understand the likely next steps before you commit to drawings, builders or formal applications.
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A loft conversion can involve more than simply choosing a dormer style or finding a builder. Head height, staircase position, planning rules, Building Regulations, structural design, fire safety, insulation, party wall matters and budget all need to be considered before the project moves too far forward.
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APN Lofts offers a project consultation route for homeowners who want to talk through their property, project stage and possible options before deciding what to do next. This can be useful if you are still exploring ideas, comparing advice, reviewing drawings, preparing for Building Regulations or trying to understand which professionals may be needed.
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Following the consultation, APN Lofts may also be able to help route your enquiry through APN Home and the Architectural Partner Network where suitable professional or contractor support is relevant.
Practical Guidance. Suitable Professionals. Better-Informed Decisions.
APN Lofts is part of the Architectural Partner Network, created to help homeowners make better-informed decisions before starting a loft conversion.
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The site is supported by practising residential design and planning professionals with over 40 years of experience across London and the Home Counties.
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Our aim is simple: to provide clear guidance, explain the practical issues that can affect a loft conversion and help homeowners find suitable professional support when they are ready to move forward.
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Practical Homeowner Guidance
Clear advice to help you understand the options before committing to a design or contractor.
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Real Residential Experience
Guidance informed by decades of hands-on experience with residential design, planning and pre-build project support.
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Suitable Professional Support
Access to relevant professionals for design, approvals, structural work and construction.
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Support at Every Stage
Helpful information whether you are exploring ideas, preparing to build or dealing with a project already underway.
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