What a loft conversion costs in Leigh-on-Sea

Rear dormer on a Leigh semifrom £45,000existing roof kept, drawings and building control included

Hip-to-gable, rear dormer, new clay roofaround £75,000the Darenth Road spec below, with en-suite and oak stairs

A Velux conversion on a loft that already has the height starts from around £28,000. Those are finished, signed-off figures, not a starting price that climbs once the work begins.

I'm Chris. I run Fox Conversions local to Leigh, five minutes in the van. We've been converting lofts across Essex since 2016. I do the survey myself, I sort the drawings and building control, and I'm on site through the build until it's signed off. The figures on this page come from jobs we've actually done in Leigh.

Why Leigh costs more than the Essex average

Three things, and you'll have at least one of them.

The roof

A lot of Leigh's 1930s roofs are clay tiles that are past their best. If the roof needs re-covering as part of the job, allow roughly £8,000 for a new clay roof. Marley clay and Code 4 lead, matched to the street.

The side access

Many Leigh semis don't have a side passage you can get a full-length steel down. We bring the beams in sections and splice them inside the loft. It takes longer, but nothing gets craned over your neighbour's roof.

The planning

Leigh has four conservation areas with Article 4 Directions. Inside one, a dormer that's permitted development two streets away needs a full application. We check your address before you spend a penny.

Book a free survey

Fox Conversions team working on a loft project in Essex

Don't take my word for it. The Darenth Road job below is a Leigh semi, hip-to-gable with rear dormer, re-roofed in clay. Photos and the client's own review are further down the page.

A recent job

Darenth Road, Leigh-on-Sea

A 1930s semi a few streets back from the estuary. The owners had run out of space but didn't want to move away from family and the water. The loft had the height for a hip-to-gable with a rear dormer, so that's what we built: a master bedroom, en-suite and walk-in wardrobe on a new floor.

What we did

Hipped side roof built up into a full gable, rear dormer across the back.
The old clay roof was past saving, so the whole roof was re-covered in Marley clay tiles with Code 4 leadwork, matched to the street.
No side access for full-length steels, so two 203 x 133 beams went in as sections and were spliced and bolted inside the loft. Nothing craned over the neighbours.
PIR insulation to current regs, new stud walls, stairs set over the existing landing to keep the head height.
Oak stairs and doors to match the rest of the house. Velux windows looking out over the estuary.

What they got

27 square metres of new floor: a 17.8 m² bedroom, a 6.2 m² bathroom with a freestanding bath, double shower and twin basins, and a 3.1 m² walk-in wardrobe. Signed off by building control.

That same spec today, with the new clay roof, comes in at around £75,000.

Rear dormer loft conversion on Darenth Road, Leigh-on-Sea — The rear dormer at Darenth Road

“Fox Conversions have recently completed my loft conversion, costs were as stated in the original quote and I requested extra work to be included which was all costed very reasonably. Nothing was too much trouble. The outcome is superb, I couldn't have wished for better results. The price quoted was better than other loft conversion companies that I received quotes from and the stage payment process is also very reassuring. This gave me peace of mind as there were no huge upfront payments. I have no hesitation in recommending Chris and his team.”
Darenth Road client. Checkatrade review.

Loft bedroom with Velux windows overlooking the Thames Estuary, Leigh-on-Sea

Hip to gable loft conversion in Leigh-on-Sea

Tap any photo to see it full size.

What makes this different from a builder who does lofts on the side.

Anyone can say they're specialists. These are the things you can actually check.

Before

After

Chris runs your job, start to finish. Survey, drawings, build and sign-off, one name and one mobile number.
No deposit. You pay in stages as the work goes up, and the last payment only when building control have signed it off.
Drawings and building control in the price. Every line itemised, so you can put our quote next to anyone else's and see what they've left out.
Lofts and garages, nothing else, since 2016. We know what's behind the plasterboard on a 1930s Leigh semi before we open it up.
60+ five-star reviews on Checkatrade, Google and Houzz. Read them all before you decide anything.

Book a free survey

Which loft conversion suits a Leigh house

Rear dormer

The most common choice on Leigh semis and terraces. Full head height across the back of the house, room for a bedroom and an en-suite, and usually permitted development outside the conservation areas.

Hip-to-gable

For semis with a sloping side roof, which is most of the Highlands Estate and Marine Estate. The hip is built up into a gable wall, usually with a rear dormer behind it. Darenth Road below is one of these.

Velux

Roof windows in the existing slope, no change to the roofline. The lower-cost option, and sometimes the only option inside Old Leigh, but only if the loft already has the height.

Mansard Loft Conversions

Great for older homes near Leigh Old Town, increasing floor area while keeping traditional style.

How a loft conversion works in Leigh-on-Sea

Leigh's housing is mostly 1930s and 40s semis, through the Highlands Estate, Belfairs and around Chalkwell, with tight side passages, shared boundaries and clay roofs that have to be matched. That shapes the order we do things in.

Before we start

Scaffold, skip permits and parking suspensions sorted early. Leigh's streets are narrow and the council is strict on skips, so deliveries are planned so nobody gets blocked in. Structural drawings and the building control notice are in before a tile moves.

Structural work

This is where Leigh differs. Without side access for full-length steels, we bring the beams in sections and splice them inside the loft, bolted in position. On Darenth Road that was two 203 x 133 beams. Slower than craning, but no crane over the neighbour's roof and no damage to the garden.

Forming the dormer and re-roofing

Roofing goes on as fast as possible so the house is weathertight. Most Leigh semis are plain clay or concrete interlocks, and matching them matters on the older streets near the Old Town and the seafront. Marley clay and Code 4 leadwork, and if the old roof is tired, this is the point it gets replaced.

Internals

Once the structure is in and the roof is watertight, the stud walls, staircase, first-fix plumbing and electrics go in. On Leigh terraces near The Broadway the staircase position is the decision that makes or breaks the floor plan below, so it's settled at drawing stage, not on site.

Staircase and access

Tight landings on 1930s semis mean the new stairs usually sit over the existing flight to keep head height and avoid losing a bedroom below. We draw it before we price it.

Finishing

Plastering, joinery, bathroom, second-fix electrics and plumbing. Oak doors and stairs where they suit the house. Then a proper clean-down and the building control inspection. You get the completion certificate, which is the piece of paper that matters when you sell.

Most Leigh lofts take six to eight weeks on site. A hip-to-gable with a new roof, like Darenth Road, is nearer ten. Allow eight to twelve weeks before that for drawings and building control, so start the conversation earlier than you think.

Book a free survey

Planning in Leigh-on-Sea: four conservation areas and Article 4

Most loft conversions in Leigh fall under permitted development. A rear dormer or Velux on a standard 1930s semi on the Highlands Estate or Marine Estate needs building regulations approval, not a planning application.

But Leigh isn't a blanket permitted-development zone. Planning sits with Southend-on-Sea City Council, and Leigh has four conservation areas: Leigh Old Town, Leigh Cliff, the Broadway hillside and Chapmanslord. Each has an Article 4 Direction that removes some of those rights. In Old Leigh that goes as far as needing a planning application to fit a single roof light. If your house sits inside one, a job that's permitted development two streets away may need a full application. We check your address against the Council's designations before any work starts, and handle the application if one's needed.

Building control, whatever the planning position

Every conversion goes through building control. That's the part that signs off the structure, the fire doors, the smoke alarms and the stairs, and we manage it from submission to the final certificate.

Insulation without losing head height

We use PIR boards and acoustic layers that meet current U-values without stealing the inches you need at the eaves. The result is a loft that's warm in January and doesn't cook in July, which matters more on a south-facing roof above the estuary than people expect.

The questions most people ask first

Usually not. Most Leigh lofts are permitted development. The exceptions are the four conservation areas, Old Leigh, Leigh Cliff, the Broadway hillside and Chapmanslord, where Article 4 removes those rights and even a roof light can need consent. We check your address with Southend Council before anything starts and handle the application if one's needed.

A rear dormer on a Leigh semi from around £45,000. A hip-to-gable with a rear dormer and a new clay roof, like Darenth Road, around £75,000, with the roof about £8,000 of that. A Velux from around £28,000. All include drawings and building control, and you get a fixed written quote after the free survey.

Six to eight weeks on site for most lofts. A hip-to-gable with a new roof is nearer ten. Before that, allow eight to twelve weeks for drawings, building control and ordering, so start talking to us earlier than you think.

Ideally 2.3 metres at the ridge. If you can stand under the ridge and reach up and touch it easily, it may be too low. Some lower lofts still work with modern insulation that recovers headroom. We measure at survey and tell you straight if it won't.

Yes. Most Leigh clients add an en-suite. Darenth Road has a freestanding bath, a double shower and twin basins in 6.2 square metres. Plumbing, tiling and waterproofing add to the figure, and we price it line by line.

Yes. Billericay, Rayleigh, Brentwood, Romford and the rest of Essex.

60+ five-star reviews on Checkatrade and Google

Read them all before making any decisions. We've got nothing to hide.

         Posted on Checkatrade  
   
   
 25 February 2026
 
 
 Trustindex verifies that the original source of the review is Checkatrade. +1
Great team, friendly, tidy and hard working
Chris and the team completed a loft conversion for us recently, and did a fantastic job converting our loft. Chris is a really calm, friendly guy, who made the whole process as easy as possible. The team were really tidy as well, and the work had minimal disruption to our house throughout. I’d highly recommend them, and would use them again any day.
  
 
     Posted on Google  
   
   Johnson Shebioba 
 25 January 2026
 
 
 Trustindex verifies that the original source of the review is Google. +3
Chris and his team were amazing in completing my Velux loft conversion. I had a number of quotes, and I am glad I chose to give the project to Fox Conversions.

From Chris’s initial visit through to completion, he and his team were professional, courteous, respectful, worked in collaboration with other tradesmen and I am very pleased with the finished result.

Chris was patient when I wanted to change or add items different to the original plans such as extra windows, a media wall or a floating shelf etc.

I would defiantly recommend Fox Conversions if you want a home improvement project done at a reasonable price and with a team that will not let you down.

Chris delivered great service over and above what I expected.

Thank you to Chris and his team.
  
 
     Posted on Checkatrade  
   
   
 20 August 2025
 
 
 Trustindex verifies that the original source of the review is Checkatrade. +2
Kitchen remodel in Victorian terrace
Chris and team did a great job of the building work in our kitchen. The team was pleasant to work with, hard working and delivered to a high standard..again.  (Chris had already done our loft conversion 2 years previously) Thanks Chris!
  
 
     Posted on Checkatrade  
   
   
 29 April 2025
 
 
 Trustindex verifies that the original source of the review is Checkatrade. +4
First floor rear extension
I recently worked with Chris and his team at Fox Conversions Ltd on a first-floor rear extension to create an extra bedroom and expand my kitchen. From start to finish, they were professional, efficient, and highly adaptable. Chris was always responsive, helpful, and clear in communication. Any issues were met with proactive, creative solutions that kept the project on track. The work was completed to a high standard, and I’m absolutely delighted with the result. I’d highly recommend Chris and his team.
He even ensured that the neighbours were kept updated & happy throughout the process.
  
 
     Posted on Checkatrade  
   
   
 16 March 2025
 
 
 Trustindex verifies that the original source of the review is Checkatrade. +4
Loft conversion with bathroom and new boiler
Chris and his team have completed work for me previously with a garage conversion, this time round I used Chris's services again but for a loft conversion because I know he is trust worthy and dependable. his work is at a good standard and his prices are competitive.
He has been flexible and mostly importantly a very honest and nice person who puts his customers first.
I would happily recommend his services and would use him again in the future.
  
 
     Posted on Google  
   
   paulette chow 
 7 August 2024
 
 
 Trustindex verifies that the original source of the review is Google. +10
We waited one year for Fox Conversions' availability to start on our loft conversion and total refurbishment of our Victorian house, and it was indeed, worth the wait! Overall project took eight months to complete, as there were changes and discovery of structural problems that needed to be addressed first. As anyone can imagine the stress for any homeowners to take on such big job, without a project manager for guidance. It was both sheer delight and relief to work with Chris as he offered clear and precise breakdown steps, costs and explanation with the work. The whole process was done professionally quick to high standards, flexibility in offering practical advice or options, no short of calamity and patience till the end. Chris and his team were punctual, friendly and tidy in their jobs. Felt like we have found 'The Foxes building empire team' for our project as various members of Chris' family were brought in to complete different parts of the project, and they were too, all amazing in their work!
There was no hesitation for Chris to return to fix some minor teething issue, as this project was complete a year ago, our house at present, looks just as good and new as the initial hand over of completion!
Fox Conversions come with our highest recommendations and we will not hesitate in working with them again for any future projects! As a matter of fact, our architect whom had recommended Chris to us, and he in turn, had commissioned Chris to undertake his loft conversion too!
The pictures shown here isn't enough to show the quality of the workmanship and final finish of the house but hopefully it will give anybody the confidence in getting contact with them.
  
 
     Posted on Google  
   
   Adam Halston 
 1 May 2020
 
 
 Trustindex verifies that the original source of the review is Google. +0
Really happy with the guys work, nothing ever was a problem.
  
 
     Posted on Checkatrade  
   
   
 27 March 2026
 
 
 Trustindex verifies that the original source of the review is Checkatrade. Outstanding Craftsmanship and a Truly Reliable Team
Chris Fox and his team were an absolute pleasure to work with from start to finish. We’ve hired Chris on two separate occasions: first for smaller works, including fitting new flooring, and later for a full renovation of our entire downstairs. On both projects, the experience was consistently excellent.

The quality of workmanship across the team was outstanding. Chris’s trusted plumber and electricians were equally professional, reliable, and highly skilled, which made a complex renovation feel seamless and well-coordinated.

What stood out most was the care and attention they showed througho
  
 
     Posted on Google  
   
   Laetitia Pancrazi 
 27 March 2026
 
 
 Trustindex verifies that the original source of the review is Google. Chris Fox and his team were an absolute pleasure to work with from start to finish. We’ve hired Chris on two separate occasions: first for smaller works, including fitting new flooring, and later for a full renovation of our entire downstairs. On both projects, the experience was consistently excellent.

The quality of workmanship across the team was outstanding. Chris’s trusted plumber and electricians were equally professional, reliable, and highly skilled, which made a complex renovation feel seamless and well-coordinated.

What stood out most was the care and attention they showed throughout. They treated our home with respect, kept everything organised, and went above and beyond to ensure every detail was right. The project was delivered on time, all our questions were answered promptly, and Chris was incredibly helpful in guiding us on materials and supplies. Even after completion, he made sure everything was finalised properly in the following weeks, which we really appreciated.

We are especially impressed with the bespoke side cabinet and window seat Chris built for us. The craftsmanship is exceptional, and these pieces have become real highlights of our home.

We wouldn’t hesitate to recommend Chris and his team for any project, whether it’s smaller interior work or a full renovation. It has truly been a joy working with them, and we are delighted with the final result.
  
 
     Posted on Google  
   
   J MR 
 9 March 2026
 
 
 Trustindex verifies that the original source of the review is Google. Chris and his team were an absolute pleasure to work with, he's knowledgeable and skilled and his quote was very reasonable. We were trepidatious about taking on such a large renovation project, comprising a loft conversion and full refit, with no prior experience, but Chris's arrival on site assuaged our concerns, and the project went smoothly with only minor hiccups. Overall I cannot recommend Fox conversions enough.
  
 
     Posted on Checkatrade  
   
   
 9 March 2026
 
 
 Trustindex verifies that the original source of the review is Checkatrade. Don't hesistate to use Fox Conversions!
Chris and his team were an absolute pleasure to work with, he's knowledgeable and skilled and his quote was very reasonable. We were trepidatious about taking on such a large renovation project, comprising a loft conversion and full refit, with no prior experience, but Chris's arrival on site assuaged our concerns, and the project went smoothly with only minor hiccups. Overall I cannot recommend Fox conversions enough.
  
 
     Posted on Checkatrade  
   
   
 24 November 2025
 
 
 Trustindex verifies that the original source of the review is Checkatrade. Dormer loft conversion
Fox Conversions were a pleasure to work with. They built our Dormer loft conversion with en-suite, and the result looks fantastic. The build was quick, passed all inspections, and met every requirement. Pricing was very reasonable, including building control drawings. Chris Fox is approachable, skilled, and improved the design during the build. He promptly fixed any snags, and his team was courteous. Highly recommend Fox Conversions for any extension project!
  
 
 
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Loft Conversions in Leigh-on-Sea

What a loft conversion costs in Leigh-on-Sea

Why Leigh costs more than the Essex average