Our Services – J2 Build

At J2 Build, we provide a complete range of construction and property improvement services across London. Based in Golders Green, our team supports homeowners, landlords, and developers with high-quality workmanship and carefully managed projects. From design and planning to structural work and finishing touches, we deliver reliable solutions tailored to your needs.

Below is an overview of the services we offer.

Architecture & Design

Our architectural design service helps you shape your project from the very beginning.
We work with experienced architects and structural engineers to create:

  • Concept drawings
  • Planning-ready drawings
  • Building Control drawings
  • Structural calculations
  • Interior layout designs

Whether you’re planning an extension, loft conversion, or full refurbishment, we ensure the design is both functional and compliant.

New Builds

J2 Build undertakes full new-build projects, handling every stage from groundwork to final decoration.
Our team delivers:

  • Residential new homes
  • Development projects
  • Outbuildings and garden rooms
  • High-spec finishes and modern building materials

We manage the entire process with precision, keeping the project on schedule and compliant with all regulations.

Extensions

We specialise in building high-quality house extensions that add space, value, and comfort to your home. Whether you want a larger kitchen, an open-plan living area, an extra bedroom, or a brighter family space, we plan and construct every extension with precision and care.

Our extension services include:

Double-storey extensions
Designed to provide significant extra room across two levels, allowing for new bedrooms, bathrooms, or extended living spaces.

Rear extensions
Perfect for opening up the back of your property and creating spacious kitchen-diners or living areas filled with natural light.

Side and side-return extensions
An excellent way to make use of unused side space, ideal for expanding narrow kitchens or creating more functional ground-floor layouts.

Wrap-around extensions
A combination of rear and side extensions, offering maximum space and a complete transformation of the ground floor.

Sitting area with a fireplace, wall-mounted TV, tiled floor with underfloor heating, and large bifolding door in a house extension project in Southgate.
Modern sitting area with fireplace, TV, tiled floor, underfloor heating, and large bifolding doors – part of a Southgate house extension by J2 Build.
  • Sitting area with a fireplace, wall-mounted TV, tiled floor with underfloor heating, and large bifolding door in a house extension project in Southgate.
  • Modern brown kitchen with a central island featuring a marble worktop and a mirror splashback in a Southgate home renovation project.
  • Modern house extension with large sliding doors, tiled flooring, fireplace feature and bright open living area by J2 Build.

    • Renovations

    Our renovation services cover everything from minor improvements to complete home transformations.
    We carry out:

    • Structural alterations
    • Internal reconfigurations
    • New flooring and plastering
    • Full property refurbishments
    • Modernisation of older homes

    We ensure all renovation work meets safety standards and enhances the overall look and usability of your home.

    Loft Conversions

    Loft Conversions

    A loft conversion is an excellent way to maximise unused space and create a bright, functional new area in your home. Whether you need an additional bedroom, a modern home office, a playroom, or built-in storage, converting your loft is one of the most effective ways to increase both living space and property value.

    We offer:

    • Dormer loft conversions
    • Hip-to-gable conversions
    • L-shaped dormers
    • Velux (rooflight) conversions

    Every loft conversion is designed to improve headroom, natural light, ventilation, and overall usability. At J2 Build, we manage the full process — from design and structural work to insulation, fire safety upgrades, and all necessary Building Control requirements. We also advise on planning permission and permitted development where needed, ensuring everything remains compliant.

    We work closely with clients during the design stage so you can clearly visualise how the final room will look before construction begins. Our goal is to create a loft space that blends seamlessly with your existing home, offering long-lasting comfort, practicality, and value.ntrol requirements.

    Loft conversion completed by J2 Build featuring new dormer windows, modern cladding, and upgraded roof structure on a North London property.
    A completed loft conversion by J2 Build, adding a new dormer level with modern cladding and double-glazed windows to a North London home.
  • Loft conversion completed by J2 Build featuring new dormer windows, modern cladding, and upgraded roof structure on a North London property.
  • Bright loft conversion hallway with skylight, new staircase, and modern wall lights completed by J2 Build.
  • Loft conversion bedroom with green walls, new radiator, and fresh carpeting completed by J2 Build.
  • Loft conversion with two skylights, built-in desk, mustard chair, and modern ceiling feature by J2 Build.”
  • Loft conversion with two skylights, exposed brick feature wall, storage doors, and neutral carpet flooring by J2 Build

    • Electrical Work

    Our qualified electricians provide safe and reliable electrical services for homes across London. Whether you are upgrading your system, adding new circuits, or completing electrical work as part of an extension or renovation, we ensure everything is installed to a high standard and fully compliant with UK regulations.

    Our electrical services include:

    • Full and partial rewiring
      Replacing outdated wiring and upgrading circuits to improve safety and efficiency.
    • New circuits and consumer units
      Installation of modern fuse boards and additional circuits for kitchens, extensions, and appliances.
    • Lighting installation
      Fitting feature lights, spotlights, LED lighting, and outdoor lighting with a clean, professional finish.
    • Power outlets and data points
      Adding new sockets, USB outlets, and data connections to support modern living.
    • Electrical testing and certification
      EICRs, safety certificates, and testing for new installations.

    All electrical work is completed to BS 7671 standards, ensuring safety, compliance, and long-lasting performance.

    LED strip lighting and recessed spotlights installed in a modern room with full-height windows overlooking the city.
    A modern pendant light installed by our qualified electrical team
  • Modern pendant light fixture with exposed filament bulbs installed by J2 Build’s electrical team
  • Modern lighting installation with LED strip lighting, recessed spotlights, and full-height glazed windows overlooking the city.
  • LED strip lighting and recessed spotlights installed in a modern room with full-height windows overlooking the city.

    • Plumbing & Heating

    We offer a range of plumbing and heating services to keep your home running efficiently, including:

    • New plumbing installations
    • Boiler installations and replacements
    • Radiators and underfloor heating
    • Bathroom plumbing
    • Hot and cold water systems

    Our team ensures every installation is safe, durable, and tailored to your home’s needs.

    Painting & Decorating

    Our finishing team delivers clean, high-quality decoration work such as:

    • Interior painting
    • Exterior painting
    • Feature walls
    • Wallpapering
    • Woodwork finishing

    We focus on crisp lines, smooth finishes, and lasting quality.

    Groundworks

    Groundworks form the foundation of every successful construction project.
    We provide:

    • Excavation
    • Drainage installations
    • Foundations and footings
    • Concrete slabs
    • Landscaping preparation

    All groundworks are completed with precision to support the structural integrity of your build.

    Contact J2 Build

    If you are planning a project and would like expert guidance, J2 Build is here to help.
    Contact us today to discuss your requirements and request a free consultation or quotation.