Delivering Quality Loft Conversions and House Extensions

We specialise in loft conversions and single to double storey extensions across, London, Essex, Hertfordshire, and Kent.

Backyard view of a two-story house with a glass extension, garden, and outdoor furniture, under a cloudy sky.
The image shows a modern extension attached to a traditional brick house with a sloped roof. The extension features large triangular glass windows and an open sliding glass door, revealing a cozy interior with a white sofa, a wooden dining table, and
A modern rear extension of a brick house with large glass doors and windows, interior wooden kitchen with island, and outdoor patio with seating, surrounded by trees and adjacent older brick buildings.
Construction site of a brick building with large open doorways and exposed wooden framing inside.
Modern brick house with large glass sliding doors revealing a contemporary kitchen and dining area, with a small lawn and garden in the foreground.
Interior of a house under construction with unfinished walls, drywall, and large windows
View of an attic under renovation with construction tools, a ladder, and partially finished roof structure.
Bright attic room with sloped ceiling and skylights, white walls, wooden floor, containing a gray sofa with pillows, a yellow dresser with a panda plush, a white desk with a chair, a teal bed with patterned bedding and pillows, yellow storage unit wi
Unfinished attic space with sloped ceilings and skylights, construction materials, and tools scattered around.
Attic under construction with exposed wooden framing, insulation, and skylights.
A house covered with construction scaffolding and white plastic sheeting on a cloudy day.

With Oakbridge Building Ltd, we offer more than just building services. You benefit from expert guidance through a dedicated project manager, a transparent and collaborative approach, and a seamless, stress-free experience. We self-deliver all projects, ensuring no involvement of third-party builders. Our strong commitment to customer care, along with the peace of mind provided by our comprehensive warranty, means you’re supported at every step.

To get your free quote, call us today on:
01708 929 600

A view of a modern, spacious urban house with large, open glass doors revealing a bright, furnished interior with a living room and kitchen, set in a garden with trees and a wooden deck.

House Extensions

Our house extension projects are designed to expand the footprint of your existing property by adding one or more new rooms. Extensions can be either single or double storey and are typically constructed to the rear, side, or as a wrap-around of the original structure.  

With a choice of flat or pitched roof designs, we can enhance natural light and transform underused areas into bright, functional spaces—such as open-plan kitchens, dining rooms, or seating areas. A well-designed extension provides a practical and cost-effective alternative to moving, offering additional living space while significantly improving both the usability and value of your home.

Types We Deliver:

  • Positioned at the back of the property, these are ideal for enlarging kitchen, dining, or living areas, and are among the most popular forms of home expansion.

  • Built along the side of the house, often in narrow alleyways, unused side passages or existing garages locations, these extensions efficiently utilise otherwise potentially wasted space.

  • A combination of rear and side return extensions, this design creates a substantial increase in interior space and can significantly alter the layout of the ground floor.

  • Constructed above existing structures, such as garages or conservatories, these extensions maximise vertical space without sacrificing garden or external areas.

  • These involve the addition of two floors, either over a new extension or the existing property, offering considerable extra space for additional bedrooms, bathrooms, or living areas. Can be delivered as side, rear or both.

Attic under construction with exposed wooden framing, skylights, and drywall installation.

Loft Conversions

With over 20 years of experience, we’ve successfully constructed a wide range of loft conversions. Whether you’re looking to add a classic dormer or an L-shaped double dormer extension, our team has the expertise to bring your vision to life.

From creating a stunning master bedroom with an en-suite to incorporating a walk-in wardrobe, we’ll help you make the most of your space.

Types We Deliver:

  • These are the simplest, involving the installation of roof windows (like Velux) into the existing roof slope. They don't create extra headroom or floor space but are a cost-effective way to add natural light and ventilation.

  • Dormers are extensions that project outwards from the roof slope, creating vertical walls and increasing headroom and floor area. They come in various forms, including single, double, flat-roofed, and gabled dormers.

  • These are suitable for properties with hipped roofs (sloping on all sides). They involve extending the sloping side of the roof to create a gable (vertical) wall, maximizing space.

  • Mansard conversions involve a more extensive alteration of the roof structure, typically at the rear of the property, creating a flat roof with sloping sides. This type of conversion typically provides the most significant increase in space but is also the most complex and expensive.

  • These combine a dormer extension on the rear of the property with a dormer on the side return, creating an L-shaped living space.

  • This type of dormer has a pitched roof (gable) rather than a flat roof, offering a more aesthetically pleasing appearance.

Oakbridge Core Values

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Customer Service – We actively seek construction efficiencies to deliver maximum value for our clients, maintain full transparency, and ensure the job is done right the first time.

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Quality – We aim to consistently deliver projects and services of the highest standard, founded on exceptional craftsmanship, superior materials, and the specialised expertise of our dedicated team.

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Cost-efficiency – Your satisfaction is our highest priority. We are dedicated to providing exceptional service and thorough aftercare, ensuring you feel confident in recommending us to others.

  • White outline of the letters O and B on a dark background.

    "They showed up when they said they would, kept the site spotless, and delivered exactly what was agreed. So, refreshing to deal with a building company you can actually trust."

    Lee Whitney - Hackney, London 

  • White outline of the letters O and B on a dark background.

    "Oakbridge treated our home like it was their own. The team was polite, tidy, and genuinely cared about getting every detail right. We felt in safe hands from start to finish."

    Ashwin Sharma - Ware, Hertfordshire

  • The text "OB" in a white modern font on a dark background.

    "Fantastic experience from day one. Clear communication, professional team, and no stress at all. The extension was completed on time and to a really high standard."

    Nancy Donovan - Upminster

  • Stylized letters "OB" in white on a dark background.

    "You can tell Mick and Lee take real pride in what they do. No shortcuts, no drama — just quality work and great service. Wouldn’t hesitate to use Oakbridge again."

    Katy Fitzgerald - Romford

To get your Free Quote, you can call us on: 01708 929 600

Map of the counties in Greater London, including Essex, Hertfordshire, East London, Southeast London, and Kent.

Areas We Cover

We proudly serve a wide range of locations across Essex, Hertfordshire, East London, Southeast London, and Kent, including:

  • Upminster, Hornchurch, Romford, Brentwood, Billericay, Chigwell, Epping, Harlow, and surrounding areas.

  • Potters Bar, Cuffley, Cheshunt, Waltham Cross, Hoddesdon, and nearby villages.

  • Ilford, Barking, Stratford, Leyton, Chingford, Walthamstow, and more.

  • Bromley, Bexleyheath, Sidcup, and Chislehurst.

  • Dartford, Sevenoaks, Orpington, West Malling, Kings Hill, and nearby towns.

Don’t see your area listed? Get in touch to find out if we can help! 01708 929 600

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Contact us today to discuss your building needs. We’re here to help.

01708 929 600

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CIOB Members

Members of the Charted Institute of Building

At Oakbridge, we take pride in delivering high-quality construction with integrity, precision, and professionalism. As proud members of the Chartered Institute of Building (CIOB), we uphold the highest standards in building practice, project management, and customer care.