The right extension depends on the house and the
The right extension depends on the house and the space around it.
House extensions · Essex
House Extensions in Essex
We design and build house extensions across Essex, from single storey kitchen extensions to full double storey additions. One team handles the design, the drawings, the planning, the building regulati
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Essex
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House extensions in Essex
We design and build house extensions across Essex, from single storey kitchen extensions to full double storey additions. One team handles the design, the drawings, the planning, the building regulations and the build, so you deal with the same people from the first visit to the finished room.
Essex is a county of real variety, and that shapes how you extend in it. A Victorian villa on the London commuter fringe, a weatherboarded cottage in a historic market town, a family home in Chelmsford and a large detached house out towards Epping Forest all call for a different approach. We plan each extension around the house it is joining.
London's most useful extension
Planning permission for extensions in Essex
This is where local knowledge earns its keep, because Essex is not a single planning authority.
Householder planning is handled by your district, borough or city council, not by Essex County Council. That means Epping Forest, Brentwood, Chelmsford, Uttlesford, Harlow and so on, each with its own local plan. Southend-on-Sea and Thurrock are separate unitary councils. Worth knowing: from April 2028 these councils are being replaced by five new unitary authorities, and Epping Forest, which covers Buckhurst Hill, Chigwell and Loughton, becomes part of West Essex Council. The rules will not change overnight, but the name on the letterhead will.
Many extensions fall under permitted development and need no application, but large parts of Essex carry protections that reduce or remove those rights:
The Metropolitan Green Belt covers much of south and west Essex, including the Epping Forest district. In the Green Belt you can still extend, but the scale is limited, so the work is not a disproportionate addition to the original house.
Matched to your house
The extension types that suit Essex homes
The right extension depends on the house and the space around it.
Single storey rear extensions open the back of t
Single storey rear extensions open the back of the house, most often for a large kitchen and family room.
Side return extensions fill the narrow strip bes
Side return extensions fill the narrow strip beside a Victorian or Edwardian home.
Wrap around extensions combine rear and side for
Wrap around extensions combine rear and side for serious ground floor space.
Over-structure extensions, above a garage or single storey section, add a bedroom or study without losing garden.
How London jobs actually run
Ground conditions across Essex
Essex has genuinely varied ground, and it changes what your foundations need to do.
Ground
Essex has genuinely varied ground, and it changes what your foundations need to do.
Access
Much of the south and the London fringe sits on London Clay, which swells and shrinks with the seasons and moves most near mature trees, so foundations often go deeper there. Across the central and northern plateau the ground is boulder clay, a stiff but variable glacial deposit that can change over a short distance. The far north west, up towards Saffron Walden, runs onto chalk, while the river valleys and the coast bring softer gravels, alluvium and made ground. On the Epping Forest ridge, sandier beds cap the clay on the higher ground.
Neighbours
None of this is a problem when it is understood before work begins. It is a problem when it is not. A builder who knows the local ground designs the right foundation from the start rather than meeting a surprise halfway down a trench.
None of this is exotic when it is planned for at the start.
Work we have built
How we work in Essex
You are inviting a team into your home for months, so trust comes before everything. We manage each project as one team, concept to completion, with the company director involved throughout. We are comfortable working alongside architects and structural engineers. We handle the planning and building control so you are not chasing councils. Our quotes are detailed and itemised. And much of our work arrives by recommendation, which keeps our name on the line with every build.
Planning & regulations
Planning permission for extensions in Essex
This is where local knowledge earns its keep, because Essex is not a single planning authority.
Householder planning is handled by your district, borough or city council, not by Essex County Council. That means Epping Forest, Brentwood, Chelmsford, Uttlesford, Harlow and so on, each with its own local plan. Southend-on-Sea and Thurrock are separate unitary councils. Worth knowing: from April 2028 these councils are being replaced by five new unitary authorities, and Epping Forest, which covers Buckhurst Hill, Chigwell and Loughton, becomes part of West Essex Council. The rules will not change overnight, but the name on the letterhead will.
Many extensions fall under permitted development and need no application, but large parts of Essex carry protections that reduce or remove those rights:
The Metropolitan Green Belt covers much of south and west Essex, including the Epping Forest district. In the Green Belt you can still extend, but the scale is limited, so the work is not a disproportionate addition to the original house.
Conservation areas, which nearly every Essex town and village has, restrict what you can do without permission.
The Dedham Vale National Landscape in the north east, the protected area formerly known as an Area of Outstanding Natural Beauty, and Epping Forest in the south west both add a further layer.
Listed buildings, of which Essex has more than fourteen thousand, need separate consent.
One Essex particular: most councils here treat the Essex Design Guide as a material consideration, so a scheme that ignores its standards on space, light and character can meet resistance. We design with all of this in mind, work out early whether your project needs permission, and prepare and manage the application where it does.
Why homeowners choose us
Why homeowners choose J Berry Construction
You are inviting a team into your home for months, so trust comes before everything.
We manage each project as one team, concept to completion, with the company director involved throughout. We are comfortable working alongside architects and structural engineers. We handle the planning and building control so you are not chasing councils. Our quotes are detailed and itemised. And much of our work arrives by recommendation, which keeps our name on the line with every build.
Where we build
The Essex areas we cover
We build across the county and are happy to travel for the right project. Our work is strongest in the south west of the county, closest to the London commuter belt. We currently have detailed pages for Buckhurst Hill, Chigwell and Loughton, the affluent towns around Epping Forest, and for neighbouring Woodford just over the London boundary. We also work across Epping, Ongar, Great Dunmow, Brentwood, Chelmsford and the surrounding villages, and out towards Saffron Walden. Follow the link to your town, or get in touch and we will confirm we cover your postcode.
BasildonBillericayBraintreeBrentwoodBuckhurst HillChelmsfordChigwellColchesterEppingGraysGreat DunmowHarlowLeigh-on-SeaLoughtonMaldonOngarWickfordWitham
If your area is not listed, call us anyway.
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Cost, in the open
What does an extension cost in Essex?
The honest answer is that it depends on size, specification, ground conditions and finish.
As a general guide for this part of the country, single storey extensions commonly run at a few thousand pounds per square metre of finished space, with double storey often better value per square metre and high specifications sitting above the base. Protected settings, sloping plots and difficult ground can add to the groundwork. Treat those figures as a starting point, not a quote.
For an early estimate you can use our cost calculator, and for a real figure the best step is a site visit where we price the actual project.
Want a real figure for your project? Book a free site visit and we will price the actual work, with a clear, itemised quote and no pressure to proceed. Call 07920 731533 · Get a free quote
Common questions
House extension questions in Essex, answered straight
The questions every Essex homeowner asks at the first site visit.
Anything else? Call 07920 731533 and you’ll speak to Jason Berry, not a call centre.
Sometimes. Many extensions fall under permitted development, but the Green Belt, conservation areas, the Dedham Vale National Landscape, Epping Forest and listed status all restrict those rights. It depends on your property and which district or borough council covers it. We check this for you early.
Your local district, borough or city council, such as Epping Forest, Brentwood or Chelmsford, not Essex County Council. Southend-on-Sea and Thurrock have their own unitary councils. From April 2028 these are being replaced by five new unitary authorities. We deal with the right authority for your address.
It depends on size, specification and ground conditions. As a rough guide, single storey extensions commonly run at a few thousand pounds per square metre, but the only accurate figure comes from a site visit. Our cost calculator gives an early estimate.
Call us on 07920 731533 or send the enquiry form. We arrange a free, no-obligation site visit, then give you a clear, itemised written quote for the actual project.
Yes. We manage the planning application, building control and any party wall notices, so you are not dealing with councils and paperwork on your own.
We work across the county, with a focus on the south west, including Buckhurst Hill, Chigwell, Loughton, Epping, Ongar, Brentwood and Chelmsford, and we travel for the right project. Contact us to confirm your area.
Start your extension
Thinking about a project in Essex?
Call 07920 731533, request a callback, or book a free, no-obligation site visit. No pressure, and no obligation to proceed.