Structural Alterations Harlow

GS Renovation carries out structural alterations to homes in Harlow: openings formed, walls removed, beams installed, floors and roofs altered. A structural engineer we appoint produces the calculations, we build to them, and we coordinate the building control application and inspections. The company is a contractor. It is not a surveyor, a party wall surveyor or an architect, and it holds no trade body accreditation.

For Harlow, on London-derived ranges a simple new opening starts from £1,500, and underpinning a single elevation typically costs £6,000 to £21,000; Essex work generally runs below that. GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Harlow.

How the job runs

1. Free site survey at your Harlow address and an itemised quote.
2. The engineer we appoint designs the work, and it is registered with Harlow District Council building control or an approved inspector. On a shared wall you serve the party wall notice as building owner; we supply the drawings.
3. Props and any trial holes first, then the opening, joists or underpinning in the engineer's sequence.
4. Building control inspects each stage before it is covered, then issues the completion certificate.

What Harlow Council treats as needing approval

Harlow Council lists structural alterations to your house and underpinning your house among the works that need building control approval, alongside extensions, loft and garage conversions and drainage work. That list is the starting point for any alteration to the fabric. Approval is not the same thing as planning permission, and a project can need one, the other, both or neither. The building control route is about the Building Regulations, and structure is covered by Approved Document A.

Inspections are booked, not assumed. Harlow Council asks for site inspections to be booked through the free Local Authority Building Control app, or by phone, and a next day inspection has to be booked by 5pm the day before. That timing shapes the programme, because the officer needs to see foundations, bearings and steelwork before they are covered up. We book around the sequence of the work rather than at the end of it.

Housing in Harlow

By the valuation list's count, Harlow holds about 40,520 homes, 71% houses and 29% flats; by age, 1% were built before 1919, 1% between the wars and 98% since 1945. Underpinning the party wall of a terrace in Harlow needs a notice to the neighbour, and 50% of homes here are terraced.

Heritage constraints on structural work in Harlow

Harlow Council records 168 statutory listed buildings and 26 locally listed buildings in the district. If your house is one of them, listed building consent is a separate consent and it can reach internal work as well as external. Policy PL12 of the Harlow Local Development Plan requires a Heritage Statement where development affects a heritage asset or its setting. That is a document to be prepared and submitted, not a box ticked on site.

Covenants are a further layer. Harlow Council states that restrictive covenants it administers can restrict residential extensions and external alterations, so covenant consent may be needed in addition to planning permission and building control approval. Three consents can therefore apply to one project, each with its own application and its own timescale. We establish which apply before the work is programmed, so nothing starts on a permission that has not been granted.

The stock: postwar estates and older buildings

Structural alteration in Harlow spans two very different kinds of building. Harlow Council's Mark Hall North character appraisal names eleven estates in the conservation area: Broomfield, Dovehouse Croft, Fesants Croft, Glebelands, Great Plumtree, Mark Hall Moors, Stackfield, Tany's Dell, The Chantry, The Gowers and The Lawn. The same appraisal records two storey houses there constructed with monopitch flat roofs, which are shorter than those built with gable roofs.

A monopitch or flat roof puts the load into the top of the house differently, so an alteration at first floor is not the problem it would be under a pitched roof with a load-bearing spine. Older buildings pose another question again. Harlow Council's Old Harlow appraisal records traditional materials and historic local building methods such as timber frames, tiled roofs and pargetting, in listed buildings ranging from the 15th, 17th, 18th and 19th centuries. In a framed building the engineer is reading a frame, not a set of masonry walls.

The ground under Harlow

The British Geological Survey maps the London Clay Formation, part of the Thames Group and described as clay, silt and sand, as the bedrock under most of Harlow. Under Old Harlow in the north east the mapped bedrock is instead the Thanet Formation and Lambeth Group, undifferentiated. The mapping comes from BGS 1:50,000 sheet 240, Epping. Where an alteration puts a new load on the ground, that difference belongs in the engineer's design rather than in a builder's assumption.

Superficial cover across Harlow is patchy rather than uniform. The BGS maps Lowestoft Formation till over much of Tye Green and Church Langley, and Head at Church Langley, but leaves other pockets of both areas with no superficial deposit mapped. Where nothing is mapped, the London Clay Formation is the material at rockhead. Two plots near each other can therefore sit on different bearing material, which is why trial holes and a site specific design beat a rule of thumb.

• Building control applications, inspections and the completion certificate
• New door and window openings in solid masonry
• Floor structure, joist and beam replacement

VOA Council Tax stock of properties, March 2025, for all 11 statistical areas in Harlow. Counts rounded by the VOA.

Related reading for Harlow homeowners planning structural alterations: home renovation in Harlow, structural alterations in Epping, a main building contractor in London, underpinning in London, our London structural alterations page and Chimney Breast Removal.

Why Harlow Homeowners Choose GS Renovation

Structural alteration in Harlow is a consent problem before it is a building problem. Building control approval, planning permission, listed building consent and covenant consent can each apply, and they are four separate routes with four separate timescales. GS Renovation works out which apply to your address, appoints the structural engineer, builds to the calculations, and coordinates the building control application and inspections. One point of contact throughout, free no obligation quotations, and a founder with over 30 years of hands on experience.

Reviewed jobs near Harlow

1 MyBuilder review from Harlow, with each customer's own job title:

• Fit an integrated door and plinth on washing machine, Harlow, 18 Jun 2021 (5 out of 5)

Read all 31 on our reviews page.

Checked by Abdelaaziz Saaid, founder and director of GS Renovation Ltd (Companies House no. 14611254). Structural design is by the consulting engineer appointed to your project.