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Central London Loft Conversions

You want more space in Central London without sacrificing your postcode, and a loft conversion is often the smartest way to achieve it. We design and build Central London Loft Conversions that add livable floor area, improve energy performance, and are delivered on a fixed price with a 10-year warranty and £5 million insurance coverage.
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We help growing families, remote professionals, investors, and first-time renovators across Central and South London turn unused roof space into bedrooms, home offices, studios, and rental units, with fully managed loft conversions from design and planning to final snagging. Every project is run by our own team, with independent weekly inspections and after-build care so you always know exactly where you stand.

Why Central London Loft Conversions Matter Now

Central London loft conversions are one of the few ways to gain a new bedroom, office, or suite without entering today’s competitive sales market or sacrificing your borough. For many homeowners, converting the loft is less disruptive than moving, especially when the structural shell is built from the outside and most clients stay in the property throughout the works.

Hundreds of homeowners a month are researching this upgrade, which means you are not alone in weighing up your options and the market is highly competitive. A well-executed central London loft conversion can position your property toward the upper end of local comparables by improving layout, EPC performance, and perceived quality, provided it is designed sympathetically to the building and signed off correctly.

The Real Problems We Solve

If you live in a Victorian or Edwardian terrace in areas like Westminster, Kensington, Pimlico, or central-adjacent neighborhoods such as Balham and Battersea, you probably recognise at least one of these frustrations.

  • Bedrooms are too few or too small for a growing family, but you want to stay close to schools and transport.
  • Working from the kitchen table or a corner of the living room is no longer sustainable.
  • You are worried about noise, dust, and whether you can realistically live in your home during works.
  • You have heard horror stories about overruns, hidden extras, or builders disappearing mid-project.
east london loft conversion

We address those concerns by offering fixed-price Central London loft conversions with a clear schedule, daily site presence, and a project manager you can speak to in person. Our builds typically runs 8 to 10 weeks for a standard dormer loft, depending on design complexity, client responsiveness, and how quickly client-supplied items like bathroom suites arrive on site.

The first one to two weeks are mostly structural work above the existing ceilings, so disruption inside the house is limited to background noise as we construct the shell. When we open the ceiling for the new staircase, usually in the second week, there is one particularly messy day, but we plan and protect routes so you can see the new space and agree the layout before we build internal walls.

Key takeaways

  • Central London loft conversions let you gain space without leaving your postcode.
  • Most clients stay in their homes throughout, apart from rare cases where we advise a short move-out for safety or comfort.
  • Fixed pricing, a clear schedule, and daily site presence remove uncertainty around cost and timelines.

Transparent Fixed-Price Quotations

We provide detailed, itemised quotations that break down every cost element of your conversion, from structural work through to final decorating touches. Our fixed-price approach means the figure we quote is the figure you pay, with no hidden extras or surprise charges emerging mid-project. This transparency allows you to budget confidently and make informed decisions about specification choices that align with your financial parameters.

Recent Loft Conversion Projects

View a selection of our loft conversion projects in London below

Tybenham Road
Rear Dormer

Merton | London

Talma Road
L Shaped Rear Dormer

Brixton | London

Tremadoc Road

Mansard Conversion

Putney | London

Plough Road
Mansard Loft Conversion 

Battersea | London

Glenister Road
Rear Dormer

Streatham | London

Rudloe Road
Rear Dormer

Balham | London

Quill Lane
Mansard Conversion

Putney | London

Newstead Road
Rear Dormer

Catford | London

View Our Design and Build Process

Check out the work of our amazing teams and
what we can achieve in your home

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Testimonials

Results Our Central London Clients See – When Central London loft conversions are planned properly, the benefits are both immediate and long term. Families gain a full extra bedroom with an ensuite, teenagers move upstairs into a private space, and living rooms are reclaimed from desks, toys, or exercise equipment.

TYPES OF LOFT CONVERSIONS

Property investors and landlords often use Central London loft conversions to create self-contained studios or high-spec bedrooms with ensuites, helping to improve yields while meeting building control standards for fire safety, insulation, and ventilation. Wellness-focused homeowners are increasingly opting for large rooflights, quiet insulation, and spa-style bathrooms so the loft becomes a calm retreat above busy city streets.

We see strong demand for multi-functional rooms: home offices that can convert into guest rooms with a sofa bed, loft gyms with fold-away equipment, or playrooms designed to evolve into study spaces as children grow. Sustainable choices such as sheep’s wool insulation, reclaimed timber, bamboo flooring, triple-glazed windows, and solar-ready roof configurations are now standard talking points in nearly every design workshop.

L shaped loft conversion services - loft conversions tooting, attic conversions batterseaPlay Video
skylight illustration in loft conversion

Skylight Conversion

Also known as rooflight conversions, Velux conversions install windows into the existing roof slope without altering the roofline, making lofts bright and airy.

loft conversion - illustrated window

Two Window Dormer

A variation of the dormer conversion with two windows, it offers more light, ventilation, and enhances property aesthetics.

dormer loft conversion

Dormer Conversion

Popular in London, it extends the roof for more floor space and headroom, fitting most house types.

Hip to gable loft conversion with rear dormer

Hip to Gable & Rear Dormer

Combines hip-to-gable and dormer techniques, transforming small lofts into spacious living areas.

loft extension

Hip to Gable

Extends the ridge line of hipped roofs to form a gable end, enlarging the loft space.

loft conversion and extension outwards

L – Shaped Mansard

Merges hip-to-gable and dormer methods, converting small lofts into roomy, functional areas.

l shaped dormer loft conversion

L-Shape Dormer

Extends over the property’s back addition with a simpler structure than the L-shaped mansard, ideal for adding rooms or open layouts.

loft extension -Terraced House

Mansard Conversion

Alters the roof structure for a larger space, commonly seen in terraced houses in London.

Increase Your Home’s Value. Enquire About Loft Rooms Today!

How We Deliver Stress-Free Loft Conversions

Central London loft conversions require precise coordination between planning rules, structural design, neighbors, and logistics such as scaffolding and access. We take responsibility for the entire journey so you do not have to manage separate designers, engineers, and trades.

We handle all drawings, structural calculations, and planning or Lawful Development Certificate applications in-house, including conservation-area considerations and party wall advice where relevant. Scaffolding is almost always required at the front and rear, sometimes at the side, and typically remains in place for most of the 8 to 10 week build so our team can work safely and efficiently.

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LOFT CONVERSIONS: OUR PERKS

Loft Conversion Complete Process

We manage the design and build for you, planning permission, structural design, building control and your project manager will be on your site almost daily to oversee the works and keep you updated.

Quality Craftsmanship

Our works are warrantied, but they will stand much monger than that. We are builders primarily and our teams are experts with quality on our mind – you will get weekly inspections by the owner to ensure we deliver.

10 – Year Warranty On All Loft Conversions

Exactly what it says. We provide you with a warranty to cover you and your home for any defect from our works so you don’t have to worry. In addition you get an independent certificate by the regulators confirming that our works meet the approved building standards.

Attic Conversions Add Value

Getting A loft or attic conversion with us can add up to 25% to the value of your home, making it one the best investments you can make.

Unlock the Potential of Your Loft. Speak to Our Experts!

Experience the Clapham Construction Difference

Contact Us For Advice On Attic Conversions

Ready to explore what is possible in your roof space? Contact Clapham Construction today to arrange your free Central London loft conversion survey, and let us help you create the extra room, calm workspace, or high-performing investment your property is capable of.

Our Central London Loft Conversion Process

Our process for Central London loft conversions is designed around transparency, craftsmanship, and accountability from day one.

  1. Discovery & free home survey
    We visit your property, measure the loft, discuss your goals, and check feasibility: head height, roof type, stair position, and potential dormer or mansard options. We also talk through whether your project is likely to fall under permitted development or require full planning permission.
  2. Concept, pricing & planning
    Based on your brief, we develop concept layouts, confirm structural approach, and issue a fixed-price quotation that details inclusions, exclusions, and provisional sums. Where needed, we prepare and submit planning or Lawful Development Certificate applications and coordinate party wall matters with your surveyor.
  3. Technical design & pre-start
    Our team finalises construction drawings, structural details, and building control compliance. You choose finishes such as windows, bathroom fittings, storage, and smart home options like lighting, blinds, and climate control. We set a target start date that fits your schedule, including builds over winter or around the festive season if that suits you best.
  4. Build, inspections & communication
    We build the loft shell from the outside as far as possible, then install stairs, run electrics and plumbing, and complete insulation and boarding. Independent weekly inspections and our internal quality checks ensure compliance with building regulations and our own standards for fit and finish. You get daily site presence and regular progress updates, which is especially valuable if you work from home.
  5. Completion, certifications & after-care
    At handover, you receive building control sign-off and all relevant documentation. Your Central London loft conversion is covered by our 10-year warranty and £5 million insurance, and our team remains available for after-build support and advice on maintenance or future projects.

Key takeaways

  • We manage everything from survey and design to planning, structure, and finishing.
  • Independent weekly inspections, building control sign-off, and a 10-year warranty give long-term protection.
  • Fixed-price contracts and clear documentation minimise the risk of surprises during your central London loft conversion.

For Central London Homeowners

Central London loft conversions often sit within tight terraces, shared roofscapes, and conservation areas. Our 20 years’ specialised experience across Balham, Battersea, Bromley, Fulham, and central-adjacent boroughs means we understand local planning nuances, typical Victorian and Edwardian roof structures, and how phase works so neighbors and freeholders are kept informed and disruption is contained.

LOCATIONS WE COVER

We operate across the whole of South London and can build lofts in the locations listed below.

Soho

With space becoming ever more valuable, many residents in Soho are looking to loft conversions to maximise their living space, adding both value and functionality to their properties.

Covent Garden

With space becoming ever more valuable, many residents in Battersea are looking to loft conversions to maximise their living space, adding both value and functionality to their properties.

Mayfair

With space becoming ever more valuable, many residents in Bromley are looking to loft conversions to maximise their living space, adding both value and functionality to their properties.

Marylebone

With space becoming ever more valuable, many residents in Marylebone are looking to loft conversions to maximise their living space, adding both value and functionality to their properties.

Fitzrovia

With space becoming ever more valuable, many residents in Fitzrovia are looking to loft conversions to maximise their living space, adding both value and functionality to their properties.

Bloomsbury

With space becoming ever more valuable, many residents in Bloomsbury are looking to loft conversions to maximise their living space, adding both value and functionality to their properties.

Holborn

With space becoming ever more valuable, many residents in Holborn are looking to loft conversions to maximise their living space, adding both value and functionality to their properties.

Clerkenwell

With space becoming ever more valuable, many residents in Clerkenwell are looking to loft conversions to maximise their living space, adding both value and functionality to their properties.

King's Cross

With space becoming ever more valuable, many residents in King’s Cross are looking to loft conversions to maximise their living space, adding both value and functionality to their properties.

Westminster

With space becoming ever more valuable, many residents in Westminster are looking to loft conversions to maximise their living space, adding both value and functionality to their properties.

St James's

With space becoming ever more valuable, many residents in St James’s are looking to loft conversions to maximise their living space, adding both value and functionality to their properties.

Charing Cross

With space becoming ever more valuable, many residents in Charing Cross are looking to loft conversions to maximise their living space, adding both value and functionality to their properties.

Belgravia

With space becoming ever more valuable, many residents in Belgravia are looking to loft conversions to maximise their living space, adding both value and functionality to their properties.

Pimlico

With space becoming ever more valuable, many residents in Pimlico are looking to loft conversions to maximise their living space, adding both value and functionality to their properties.

USEFUL LOFT CONVERSION GUIDES

TYPES OF ROOF SUITED FOR LOFT CONVERSIONS

  • Framed Roofs: Preferred for cost-effective space expansion in loft conversions.
  • Pre-1960 Homes: Feature rafters for ample conversion space.
  • Reinforcement: Older homes’ rafters may need structural engineer guidance.
  • Trussed Roofs: ‘W’ shaped rafters; conversion requires ‘A’ shaped transition.
  • Stability: Steel beams between walls and ridge enhance stability.

THINGS TO CONSIDER FOR LOFT CONVERSIONS?

  • Assess Suitability: Evaluate loft’s purpose suitability before conversion.
  • Structural Factors: Consider headroom, roof pitch, and obstructions.
  • Plumbing: Ensure space for plumbing; seek alternatives if limited.
  • Heating: Consider sealed systems for space constraints.
  • Hot Water: Unvented cylinders might be preferable to combi boilers.

MAXIMISING YOUR LOFT CONVERSIONS POTENTIAL

  • Optimal Lighting: Mix natural and artificial sources for spacious feel.
  • Functional Use: Convert unused areas to bedrooms or studies.
  • Eaves Use: Create storage or reading nooks creatively.
  • Home Harmony: Integrate and optimise all available spaces.
  • Versatility: Ensure adaptability for relaxation, work, or storage.

UK BUILDING REGULATIONS FOR LOFT CONVERSIONS

  • Structural Soundness: Ensure conversions maintain property safety.
  • Fire Safety: Mandatory escape routes and smoke alarms are essential.
  • Energy Efficiency: Use high-quality insulation for sustainability.
  • Acoustic Comfort: Sound insulation reduces noise transfer.
  • Safe Access: Staircase designs must meet specific safety criteria.

WHAT IS THE MINIMUM HEIGHT FOR A LOFT CONVERSION?

  • Regulation: UK doesn’t specify a minimum height; comfort is key.
  • Practical Height: 2.2 metres from floor to ceiling is recommended.
  • Roof Influence: Pitch and structure affect available headroom.
  • Adjustments: Raising roof or lowering floor can increase height.
  • Feature Considerations: Account for beams or skylights in height.

BUILDING REGULATIONS APPROVAL & LOFT CONVERSIONS

  • Mandatory Approval: All UK loft conversions require it.
  • Surveyor Role: Inspections focus on regulations; completion certificates issued.
  • Thermal Efficiency: Meet U-value targets for desired standards.
  • Safety Emphasis: Ensure measures against falls and escape routes.
  • Fire/Electrical: Adhere to stringent safety standards.

DO LOFT CONVERSIONS NEED PLANNING PERMISSION?

  • PD Rights: Many conversions don’t need separate permissions.
  • PD Stipulations: Properties must adhere to specific volume limits.
  • Roof Limits: No alterations to existing roof height or slope.
  • Balcony Rules: Most aren’t permitted; Juliet balconies are exceptions.
  • Special Cases: Verify PD eligibility; consider a Lawful Development Certificate.

IMPROVING ENERGY EFFICIENCY WITH A LOFT CONVERSION

  • Dual Benefits: Gain space and boost energy efficiency.
  • Modern Insulation: Enhance thermal performance in conversions.
  • Efficient Windows: Reduce heat loss and save energy.
  • Reduced Bills: Proper insulation leads to energy savings.
  • Year-Round Comfort: Ensure insulation standards for all seasons.

LOFT CONVERSIONS VALUE, COSTS, AND EXPERTISE

  • Value Boost: Loft conversions can increase property value by up to 20%.
  • Cost Range: Depending on loft type typically upwards of £40,000 +.
  • Comprehensive Estimates: Cover design, modifications, and construction.
  • Expert Consultation: Seek guidance for detailed understanding.
  • Trusted Firms: Companies like Clapham Construction offer insights.

COMPONENTS OF A LOFT CONVERSION 

  • Ceiling Joists: Ensure joists bear added load; consult a structural engineer.
  • Staircase: Plan for regulation adherence and space efficiency.
  • Heating: Achieve warmth through radiators and insulation.
  • Ventilation: Maintain optimal air quality with windows or vents.
  • Design Cohesion: Ensure the conversion complements the existing home aesthetics.

MAINTENANCE FOR YOUR LOFT CONVERSION

  • Regular Checks: Consistent maintenance ensures longevity.
  • Inspections: Identify wear; professional checks every two years.
  • Material Care: Address specific requirements, e.g., wooden beams.
  • Ventilation: Check systems to avoid dampness and mould.
  • Warranty: Be aware of warranties for workmanship or materials.

SAFETY IN LOFT CONVERSIONS

  • Structural Integrity: Consult a structural engineer for weight guidance.
  • Fire Safety: Adhere to regulations for escape routes and alarms.
  • Ventilation: Combat dampness and ensure warmth.
  • Electrical Norms: Adhere to safety standards for installations.
  • Safe Access: Ensure staircase width and headroom.

Secure Your FREE Site Survey and Fixed-Price Quote Today

Safety, Regulations, and Year-Round Builds

Your Central London loft conversion must meet current building regulations on structure, fire safety, insulation, ventilation, stairs, and glazing. We work closely with structural engineers and building control officers so every joist, beam, and fire door is correctly specified and inspected, including smoke alarms, escape routes, and insulation thickness.

Most loft conversions still qualify under existing permitted development rights as long as volume limits, height, and materials are respected, but flats, listed buildings, and conservation-area properties often require full planning permission. In all cases, we recommend securing a Lawful Development Certificate so future buyers, surveyors, and lenders can see your loft was carried out in line with regulations and is protected by the 10-year rule on enforcement.

We build Central London loft conversions all year round. Each season brings different considerations, but the core program remains similar, and we protect your home with temporary coverings and careful sequencing. The best time to start is the period that aligns with your family calendar, school terms, and personal commitments, not a narrow “ideal” weather window.

ATTIC & LOFT CONVERSION GUIDES

New Build Houses

Read on to find out more about how new build houses can benefit from a professionally designed and executed loft conversion, adding valuable space and increasing the overall value of the property.

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Detached Houses

Find out more about the potential of detached houses and how a well-planned and executed loft conversion can transform them into spacious and functional living spaces.

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Semi-Detached Houses

Semi-detached houses offer great potential for a well-designed loft conversion, Read our guide on semi-detached loft conversions here.

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Terraced Houses

A terraced house loft conversion can provide many benefits beyond just added space and increased value. It can also improve the overall functionality and layout of the house.

Read More

Start Your Central London Loft Conversion

Bringing forward a Central London loft conversion is ultimately a decision about how you want to live in your home for the next decade. The cost of inaction is easy to overlook: every year you delay, you may be living with cramped bedrooms, compromised workspaces, and a layout that does not match your life today. Meanwhile, construction costs and regulatory standards continue to evolve.

The first step is simple and carries no obligation. Book a free home survey, and we will:

  • Measure your loft and confirm whether a central London loft conversion is structurally viable.
  • Outline permitted development versus planning routes for your address.
  • Provide a clear, fixed-price indication and realistic 8 to 10 week timeline based on your chosen layout.

From there, we can schedule a planning advice call to discuss more complex scenarios such as conservation areas, mansard roofs, or potential rentable units. If you like to dive into the detail, we can also share our loft price calculator and structural guide so you understand how joists, steels, and insulation work together in your specific project.

As one of South London’s foremost loft-conversion specialists, we are committed to unlocking hidden space in London homes through honest expertise and accountable project management. Central London loft conversions are a significant investment, and you deserve a partner who treats your home with the care, transparency, and craftsmanship it warrants.

Find Our More About Loft Conversions Today!

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