House Extension & Loft Conversion Builders Across London Trusted for Over 30 Years

house extensions london


London’s family-run building company, serving homeowners across Greater London, Surrey, Kent, Essex and Hertfordshire for over three decades. We specialise in house extensions, loft conversions, kitchen renovations and bathroom installations — working within a 30-mile radius of central London.

When you contact us, you speak directly with Jozeph — the owner, the builder, and the person responsible for your project from the first site visit to the final handover. No project managers. No cold call-centres. Just honest, experienced craftsmanship.


Call or text: 07860 937539

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Why London Homeowners Choose J&D


We’ve built and renovated properties across South London, Surrey and Kent since the mid-1990s. Most of our work comes through word of mouth — homeowners in Croydon, Bromley, Sutton and Sevenoaks recommending us to their neighbours. That reputation is everything to us.

Loft conversion and house extension builders South London Croydon

Direct access to the owner

Jozeph handles every project personally. You’ll have his mobile number from day one.

Transparent, itemised quotes

No vague estimates. Every quote breaks down materials, labour, timelines and contingency. You know exactly what you’re paying for.

30+ years of London property knowledge

We buy materials at trade prices. That saving comes to you, not our margins

Trade discounts passed on to you

We understand Victorian terraces, Edwardian semis and post-war builds — the quirks of London housing stock that trip up less experienced builders.

30-mile radius, 6 counties

Greater London, Surrey, Kent, Essex, Hertfordshire and Buckinghamshire — one local team, real local knowledge.

About us | Coverage map

Detailed Service Information

house extensions london

Kitchen Renovations

The kitchen is the room families live in. Getting it right — the layout, the light, the connection to the garden — makes a genuine difference to daily life. We’ve renovated kitchens from compact galley layouts in Camberwell to full rear extensions with bi-fold doors in Surrey.

We don’t just fit kitchens. We handle the groundworks, steel beams, plumbing, electrical, plastering and finishing. One team, one point of contact, one quote.

Learn More About Kitchen Renovation →
house extensions london

Bathroom Renovation

A well-designed bathroom doesn’t need to be large — it needs to be thought through. We handle full bathroom renovations from start to finish: layout, tiling, plumbing, electrical, and finishing. Whether it’s a compact en-suite in a Croydon terrace or a full family bathroom overhaul in Surrey, we don’t cut corners on waterproofing, drainage, or detail.

No subcontractors. No handoffs. The same team that strips the room out fits it.

See Our Bathroom Projects→
house extensions london

Living Rooms & Bedrooms

Sometimes a home doesn’t need more space — it needs its existing space used better. We’ve opened up Victorian terraces in Bromley, reconfigured bedroom layouts in Sutton, and added en-suites to period properties across South London and the Home Counties. Structural work, plastering, electrics, decoration — all handled under one roof.

If a room isn’t working for how your family actually lives, we’ll help you change that.

Explore Living Room & Bedroom Projects →
house extensions london

Loft Conversion

A loft conversion adds more value per square metre than almost any other home improvement — and in London’s property market, every square metre counts. We specialise in dormer conversions (the most popular choice in South London’s Victorian terraces), Velux conversions for budget-conscious homeowners, and mansard conversions where maximum floor space is the priority.

Recent projects: Dormer loft conversion in Croydon (3-bed terrace, completed 7 weeks). Velux conversion in Sutton. Hip-to-gable in Bromley.

See Our Loft Conversions →
house extensions london

House Extensions

From a modest single-storey kitchen extension to a full double-storey rear build, we’ve designed and constructed extensions across London’s most distinctive housing stock. Victorian terraces in Croydon and Bromley. Edwardian semis in Sutton and Epsom. Modern properties across Greenwich and Lewisham. Every extension starts with a conversation – not a sales pitch.

We’ll visit your property, assess the structural requirements, and give you an honest view of what’s achievable within your budget and timeline.

See Our Extensions →
house extensions london

Garden Buildings

A garden office built properly is worth far more than a flat-pack shed with an extension lead. We design and construct garden offices, studios, and outbuildings that are insulated, wired, and finished to the same standard as the rest of your home — because that’s what they are. Recent projects include garden offices in Epsom and Oxted, and a studio conversion in Bromley.

If you’re working from home long-term, it’s worth doing once and doing right.

Get Inspired for Your Garden →

Areas We Serve: 30-Mile Radius from London


We operate within a 30-mile radius of Central London. Unlike larger contractors who treat this as a wide net, we genuinely know these areas — the building regulations, the local authority planning policies, the party wall considerations specific to each borough. Our most active areas are South London (Croydon, Bromley, Beckenham, Sutton, Carshalton), Surrey (Epsom, Reigate, Guildford, Woking) and Kent (Sevenoaks, Orpington, Dartford). We also take select projects in North and West London, Essex and Hertfordshire.

Kent:

  • Sevenoaks
  • Tonbridge
  • Tunbridge
  • Wells
  • Dartford
  • Gravesend
  • Orpington
  • Maidstone (selected areas)

Greater London:

  • South London (Croydon, Bromley, Beckenham)
  • South East London (Greenwich, Lewisham, Eltham)
  • South West London (Wimbledon, Kingston, Richmond)
  • Central London (selective projects)

Surrey:

  • Reigate
  • Redhill
  • Dorking
  • Guildford
  • Epsom
  • Ewell
  • Sutton
  • Carshalton
  • Woking
  • Weybridge
  • Esher

Essex & Hertfordshire:

  • Brentwood
  • Chelmsford areas
  • Watford
  • St Albans

Buckinghamshire

  • Selected projects in High Wycombe
  • Amersham
  • Beaconsfield

Check the map below to see if we cover your area:

Ready to talk about your project?

We’ll arrange a no-obligation site visit and give you a written quote within a week. We don’t use call centres or sales scripts. You’ll speak with the builder.

Call or text Jozeph directly 07860 937539.
Email us:

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Why Homeowners Across London Choose J&D Building:

house extensions london
  • Direct Communication – Deal with the owner, not project managers
  • 30+ Years Experience – Proven expertise in London property renovation
  • 30-Mile Coverage – Serving London, Surrey, Kent, Essex, Herts & Bucks
  • Quality Materials – Trade discounts passed on to clients
  • Fully Insured – Complete peace of mind for your property
  • Transparent Pricing – Clear, detailed quotes with no hidden costs
  • Multi-County Knowledge – Understanding of London and Home Counties building regulations

Ready to start your project? Contact us today for an honest consultation and competitive quote.

J&D Building – Your trusted partner for quality home improvements across London and the Home Counties.

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