Extensions in Clacton-on-Sea

Extending in Clacton-on-Sea

The largest town in the district, and the one place round here where the usual enquiry is not a rear extension at all.

Clacton is the biggest settlement in Tendring by a long way. The 2021 census put the town at around 53,200 people, out at the eastern end of the A133 from Colchester. Nothing else in the district is close to that size, and the scale changes the work: this is a town with several distinct building eras sitting side by side, not a village with one.

The practical consequence turns up in the first phone call. Inland, people ring about the back of the house. In Clacton they ring about the roof. That follows directly from what was built here and when, and it changes what needs permission, what the survey has to establish, and where the money goes.

Great Clacton came first, and the town came later

The medieval village is inland; the resort was laid out on the cliff from 1871 and everything else filled the gap.

Great Clacton, up around the church on the higher ground, is the old settlement and has the parish name. The seaside town below it is Victorian, built as a resort from the 1870s outward from the pier, then extended steadily along the cliff in every decade since.

Between and behind those two there is a very large belt of interwar and post-war housing, and a great deal of it is single storey. Bungalows and chalet bungalows were built here in enormous numbers, on generous plots, for buyers who wanted level living within reach of the sea. Holland-on-Sea to the east is largely this. So are wide stretches of the northern and western fringes.

That belt is the reason loft conversion dominates the enquiries. A bungalow already has the footprint, the drains and the foundations. Going up gives you a whole floor without touching the garden, and it is almost always the cheapest square metre available on the plot.

The roof decides it, and the roof splits by decade

A prewar Clacton bungalow and a 1970s one look similar from the pavement and are two different jobs inside.

Roofs built before roughly the mid 1960s were cut and pitched on site: rafters, a ridge, purlins carrying the middle of the span, and open space between them. That structure can usually be adapted. New floor joists go in to carry the room, the purlins are supplemented or replaced with steel where the layout demands it, and the roof line stays where it is.

From the mid 1960s onwards the trussed rafter took over, and it fills the loft with a lattice of timber that looks like clutter and is not. Every member of a truss is carrying something. A truss with a bit cut out of it is no longer a truss. Converting that roof means replacing the structure: new steels or purlins to hold the roof up, new joists to hold the floor, and a working sequence that supports everything while the trusses come out. It is a real cost, it is entirely predictable from the survey, and there is no excuse for a quotation that has not allowed for it.

Head height settles the rest. Many of these roofs are shallow pitched and the constraint is not the room, it is the staircase, which needs proper headroom over its whole run. Where the height is not there, the honest answer is that the ridge has to rise, and raising a ridge is a planning application rather than a certificate. Our guide to extending a bungalow walks both routes.

Within permitted development, roof enlargement is governed by Class B: a volume allowance of 50 cubic metres on a detached or semi detached house and 40 on a terrace, nothing above the highest part of the existing roof, and nothing forward of the plane of the front roof slope. That last one is why the dormer goes on the back and the front gets rooflights in the plane of the slope instead.

Two conservation areas, and most of the town is in neither

Tendring District Council is the planning authority, and it has designated two separate areas here rather than one.

Applications in Clacton go to Tendring District Council, decided against the Tendring District Local Plan 2013 to 2033 and Beyond, whose Section 1 was adopted in January 2021 and Section 2 in January 2022. There is no neighbourhood plan covering the town.

The designations are worth knowing precisely because they are small. Great Clacton conservation area covers the historic village core inland. Clacton Seafront is a separate designation made in 2001, taking in part of the planned resort between Marine Parade, Church Road and the High Street, the streets immediately north of Marine Parade West, and the pier at its centre. The great bulk of the town, including nearly all of the bungalow belt, sits outside both.

Inside either one the property becomes what the legislation calls article 2(3) land, and specific rights disappear: no side extension under permitted development, no two storey rear extension, no cladding, and no roof dormer, because Class B does not apply on that land at all. Rooflights are the exception people get wrong in both directions. They fall under Class C, which carries no such exclusion, so a rooflight sitting within 150 millimetres of the plane of the slope and no higher than the ridge stays permitted development on a designated frontage unless an Article 4 direction says otherwise. Our page on conservation areas and extensions sets out how those applications are put together.

The Article 4 direction that catches Clacton owners

It has nothing to do with extending and everything to do with what happens afterwards.

Tendring made a district-wide Article 4 direction removing the permitted change of use from a dwellinghouse to a small house in multiple occupation. It was made in December 2011 and came into force on confirmation on 31 May 2013. Since then, letting a house in Clacton room by room to unrelated occupiers needs planning permission in its own right, everywhere in the district.

That matters here because a loft conversion adding two bedrooms to a seaside house is sometimes bought as an investment rather than as a family move. The building work is one question and the use is another, and the second one is easy to walk into by accident. There is also a direction recorded over land at Frinton Road in Holland-on-Sea, further directions over parts of Jaywick, and one over sites in Little Clacton and Weeley, so an address on the fringes is worth checking rather than assuming. Our guide to Article 4 directions covers how to look yours up.

The cliff, and what it does to a plot at the top of it

The seafront is a defended London Clay cliff, and the ground behind it behaves accordingly.

The frontage from the pier east to Holland Haven is a sand and shingle beach backed by cliffs of London Clay, held by a seawall, promenade, rock groynes and recharged beach. It is an actively managed structure rather than a natural coast, and sections of the slope have needed stabilising in recent years where groundwater built up behind the face.

For most of Clacton this is somebody else’s engineering problem. For a house near the top of the slope it is not. Slope stability is a function of what the groundwater is doing, so anything that changes where water goes matters: a new roof area, a new patio, a soakaway discharging into clay that is already holding water it cannot shed. On a cliff-top plot the drainage design stops being a formality and becomes the part the extension actually turns on.

Clay under gravel, and why the trial hole is not optional

The map says London Clay. The top two metres often say something else.

The bedrock across the town is London Clay, shrinkable and sensitive to trees in the way it is everywhere in Essex. Over much of Clacton it is capped by Thames terrace gravels laid down before the river was diverted, and the thickness of that cap varies street by street, as it does west along the coast in St Osyth.

Two things follow. A foundation founded in gravel and one founded in clay are different depths and different money, and neither is knowable from the postcode. And a soakaway that works perfectly in a gravel garden does almost nothing a few hundred metres away where the gravel has thinned out and the clay is close to the surface. Both are settled by digging a hole and looking, which takes an afternoon. Our guide to Essex clay, shrinkage and heave explains what the clay does when trees are involved.

Salt, and the fixings nobody sees

Within reach of the spray, the specification quietly changes.

On the seaward streets, salt-laden air shortens the life of anything metallic that is not chosen for it. Galvanised fixings that would last a lifetime three miles inland corrode noticeably faster here. Wall ties, restraint straps, lintel bearings, cladding fixings and the ironmongery on new doors are all worth specifying up to stainless in that strip, and it costs very little at the point of ordering and a great deal to put right later.

The same logic applies to the frames. Powder-coated aluminium and good quality hardware handle a coastal setting well. The cheapest bifold on the market does not, and it is the running gear rather than the glass that gives up first.

Access, and what the plots give you

The bungalow belt is one of the easier places in the district to build.

Interwar and post-war Clacton was laid out with driveways, side gates and space. Materials come round the side, spoil goes into a skip standing on your own hardstanding rather than on the highway under a permit from Essex County Council, and the concrete wagon can usually reach the back of the house. Against the same drawing built on a terrace with no rear access, that is worth real money.

The exceptions are the Victorian resort streets behind the seafront, where frontages are tight, parking is contested and rear access is often nothing wider than a gate. The constraints there are the ones set out in extending a terraced house.

What people build here

Four briefs cover most of the work, and all four follow from a town of single storey houses on decent plots.

Loft and chalet conversions come first, with a rear dormer to make the head height work. Rear extensions to open a bungalow into a kitchen and living space come second, and the plots take them comfortably. Garage conversions are third, because the 1960s to 1980s houses here have integral garages that stopped holding a car years ago and already have three walls and a roof. Annexes are fourth, on the larger plots, usually because an older relative is moving closer.

Questions we get asked in Clacton

Do I need planning permission to convert the bungalow loft?

Often not, if the volume added stays within the Class B allowance, nothing rises above the existing ridge and nothing projects forward of the front roof slope. The moment the ridge has to come up for head height it becomes an application. It is decided with a tape measure, not a rule of thumb.

Am I in one of the conservation areas?

Probably not, but it depends entirely on the address. Great Clacton and the seafront are designated and most of the rest of the town is not, so we check the boundary against your property before anything is drawn.

My house is a bungalow with trusses. Is the conversion still worth doing?

Usually yes. Replacing the roof structure adds cost but it is a known cost, and you are still buying floor area over an existing footprint without extending the drains or losing garden. What it should never be is a surprise halfway through.

Does living near the sea change the build?

On the seaward streets, yes, in the specification rather than the design. Stainless fixings, coastal-grade hardware, and more care about where surface water goes if you are near the top of the cliff.

Getting a price for a Clacton extension

We are based in West Bergholt on the far side of Colchester, and Clacton is a straight run out on the A133.

Our team comes out, gets into the loft if there is a roof in question, establishes whether the trusses are trussed rafters or a cut roof, measures the height available over a new staircase, looks at the ground, the access and the drain runs, and tells you what the job depends on before telling you what it costs. Most people who call us already have drawings and permission and want a builder to price the work and build it. That is the ordinary job here, and we are glad to work to somebody else’s plans. Where the drawings do not exist yet, we bring in the technician who draws it and the structural engineer we work with to calculate it, we handle the application with Tendring District Council, we notify Building Control, and we run the job as main contractor so you are not the one managing five trades who each blame the others.

We carry £2m public liability cover and build to current Building Regulations, through to the completion certificate. The survey and the quotation cost nothing.