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Loft conversions, house extensions, renovations, basements and new builds across London and Hertfordshire.
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Loft conversions, house extensions, renovations, basements and new builds across London and Hertfordshire.
Services
Loft conversions, house extensions, renovations, basements and new builds across London and Hertfordshire.
Services
Loft conversions, house extensions, renovations, basements and new builds across London and Hertfordshire.
Services
Call 020 8037 7332 or get an instant estimate online.
The 6-Metre Extension: How Many London Homeowners Use Prior Approval, Which Boroughs Refuse the Most, and Where the Neighbours Object — Nine Months of Government Data
Between October 2025 and June 2026 London's 33 boroughs decided 3,398 prior-approval applications for larger rear extensions — the 6-metre route on a terrace or semi, 8 metres detached. Two in three went through with no neighbour objection; 23 per cent were refused. But the borough matters: Enfield, Bexley and Hillingdon refuse under one in ten, Barnet 45 per cent, Lewisham one in two. Every borough and the ten Hertfordshire districts ranked, and when the 3-metre extension is
LCCL Construction
3 hours ago8 min read
Loft Conversions in South East London: Which Loft Suits the Terraces of Lewisham, Southwark, Greenwich, Bromley and Bexley, the Conservation Areas, and Prices
South east London is the biggest stock of Victorian terraces in the capital — Brockley, Nunhead, Peckham, Catford, Plumstead — with Edwardian semis in Blackheath and Eltham and 1930s semis across Bromley and Bexley. The house decides the loft; the borough and the conservation area decide the planning route. This guide covers the loft for each house type, the 40 and 50 cubic metre allowance, what the five councils' building control inspects, the prices inc. VAT and the Lewisha
LCCL Construction
4 hours ago7 min read
Extend or Move? What a London Move Costs in 2026, Set Against a Loft or an Extension — With the Numbers
Moving from an average London terrace to an average London semi costs about £40,000 in stamp duty, agent, legal and moving fees before the £82,000 price step — money that is gone on completion day. A rear dormer loft starts from £56,400 inc. VAT, a rear extension from £42,000, and Nationwide puts the value added by a bedroom-and-bathroom loft or extension at up to 24 per cent. The arithmetic, every figure sourced and dated, and the cases where moving still wins.
LCCL Construction
2 days ago9 min read
Cubic Metres, Not Square Metres: The 40 and 50 m³ Loft Conversion Allowance Explained, With the Numbers for Every Loft Type
The two numbers every loft guide quotes measure different things: the permitted development allowance of 40 or 50 cubic metres, and the 20 to 40 square metres of floor a loft gives you. Mixing them up sends people the wrong way in both directions. This explainer sets out what the volume rule measures, how it is counted on the outside of the new roof, what each loft type uses and gives, and when the arithmetic tips a loft into a planning application.
LCCL Construction
2 days ago7 min read
Loft Conversions in Fulham SW6: L-Shaped Dormers on the Victorian Terraces, Conservation Areas, Hammersmith and Fulham's Planning Record and Prices
Fulham is two-storey Victorian terraces almost end to end — the Peterborough estate, Munster Road, Parsons Green, Hurlingham — nearly all with a rear outrigger, which makes the L-shaped dormer the loft most of SW6 ends up with. Much of the postcode is in a conservation area, and Hammersmith and Fulham approves 98 per cent of householder applications but agrees an extension of time on most. This guide covers the loft, the route, building control and prices inc. VAT.
LCCL Construction
2 days ago7 min read
Loft Conversions in Walthamstow E17: L-Shaped Dormers on the Warner Terraces, Mansards, Permitted Development and Prices
Walthamstow is terraces: the Warner half-houses and the Victorian and Edwardian terraces that cover most of E17, with a rear outrigger behind nearly every one. That makes the L-shaped dormer the loft that suits most of the postcode, the rear dormer the quicker alternative and the mansard the answer where the roof is too low for either. This guide covers which loft fits which house, where the conservation area changes the answer, building control and what each loft costs inc.
LCCL Construction
2 days ago7 min read
Rear Extensions in Brockley SE4: Side Returns and Rear Extensions on the Victorian Terraces, the Conservation Area, Permitted Development and Prices
Brockley is one of the largest Victorian suburbs in south-east London: wide tree-lined roads of three-storey terraces and villas with rear additions, long gardens and side returns, most of it inside the Brockley conservation area. This guide covers which extension suits an SE4 house, where the conservation area changes the permitted development answer, what Lewisham's building control inspects, what each extension costs inc. VAT and the terrace projects of ours that show how
LCCL Construction
2 days ago7 min read
Basement Conversions in Kensington and Chelsea: What the Royal Borough Allows, What It Costs and How a Basement Gets Approved
Kensington and Chelsea has the strictest basement policy in London and, after the loft and the rear extension, the basement is usually the last space a house there has left. This guide covers the three kinds of basement — a cellar refit, a lowering and a new dig — what the Royal Borough's policy allows, what the planning application has to contain, what building control and the neighbours will ask for, and what each costs inc. VAT, with the St John's Wood basement we built as
LCCL Construction
2 days ago7 min read
House Extensions in Notting Hill W11: Rear and Side-Return Extensions on the Stucco Terraces, Conservation Areas, Article 4 and Prices
Notting Hill is almost entirely conservation area — Pembridge, Ladbroke, Norland, Kensington Park — and most of its houses are stucco terraces with a rear addition and a side return. A modest rear extension usually stays permitted development even here, the larger 6-metre route does not, side extensions need an application and several streets carry Article 4 directions. This guide covers which extension suits a W11 house, the planning route, building control and the prices in
LCCL Construction
2 days ago7 min read
Which London Councils Decide Your Extension Fastest? 24,000 Householder Applications, Ranked by Borough
Every householder planning application — an extension, a loft, a garden room — is supposed to be decided in eight weeks. We took the government's district data for the year to 30 June 2026, nearly 24,000 London decisions and 5,000 more in Hertfordshire, and ranked every council on how many it decided on time, how many of those needed an agreed extension of time to count, and how many it approved. The gap between the best and worst borough is wider than most homeowners expect.
LCCL Construction
5 days ago8 min read
Loft Conversions in Enfield EN1 and EN2: Hip-to-Gables on the 1930s Semis, Dormers on the Terraces, Permitted Development and Prices
Enfield is 1930s country: hipped-roof semis in Bush Hill Park, Grange Park, Oakwood and Enfield Chase, with Victorian and Edwardian terraces around Enfield Town and Ponders End. The loft that suits each is different — a hip-to-gable with a rear dormer on the semis, a rear or L-shaped dormer on the terraces — and so is the planning route. This guide covers which loft fits which house, where conservation areas change the answer, what building control inspects and what each loft
LCCL Construction
5 days ago7 min read
Loft Conversions in Kensington W8: Mansards on the Stucco Terraces, Conservation Areas, Article 4 and What a Loft Costs
Kensington is the one part of London where the usual loft answer is reversed. Almost every street sits in a conservation area, most of the houses are terraces with a parapet and a butterfly roof, and the loft that works is a mansard — which always needs a householder planning application. This guide covers which loft suits a Kensington house, what the Royal Borough's conservation and Article 4 rules change, what building control inspects and what a loft costs inc. VAT.
LCCL Construction
5 days ago7 min read
Is Open Plan Over? What 134 London Homeowners Actually Priced in October
This week's property pages say open plan has had its day and homeowners want rooms with doors again. We checked what London homeowners actually asked for when they priced an extension on our estimator in October 2026: 134 estimates, 88 with an extension, and 40 of those — 45 per cent — chose to knock through into the existing house. The other half kept the wall. That is not the end of open plan; it is broken plan, and this is what it costs and when each answer is right.
LCCL Construction
6 days ago6 min read
Why Two London Extension Quotes Can Be £50,000 Apart: We Checked 40 Published Price Pages
On 2 November 2026 we read 40 published price pages for London loft conversions, extensions, garage conversions and basements — builders, design-and-build firms, architects and the national trade guides — and put every figure on the same basis. The spread for an identical job was up to £50,000. Only 9 of the 40 pages said whether VAT was included; only 2 said the price covered design, structural calculations and building control. This is what we found, why quotes differ, and
LCCL Construction
Nov 48 min read
Loft Conversions in Ealing W5: L-Shaped Dormers on the Victorian Terraces, Hip-to-Gables on the 1930s Semis, Permitted Development and Prices
Ealing's housing runs from Victorian and Edwardian terraces around the Common and the Broadway to 1930s semis towards Pitshanger and Hanger Hill, and each gives a different loft: an L-shaped dormer over the outrigger on the terraces, a hip-to-gable with a rear dormer on the semis. This guide covers which loft suits which Ealing house, where conservation areas and Article 4 directions change the permitted development answer, what building control inspects and what each loft co
LCCL Construction
Nov 47 min read
Loft Conversion in a Conservation Area: What Changes, What Is Still Allowed and How to Get It Approved in London
A conservation area does not stop a loft conversion; it changes the route. Dormers and hip-to-gables lose their permitted development rights and go through a householder planning application, while a rooflight loft usually stays permitted development. This guide explains which rights the designation removes, what still goes ahead without an application, what London conservation officers ask for in a dormer design, how long it takes and what it costs inc. VAT.
LCCL Construction
Nov 48 min read
Party Wall Notice for a Loft or Extension: What Happens, When, and How Long It Adds
On a terrace or a semi the party wall is the one thing you share with the neighbours, and the Party Wall etc. Act 1996 sets out how you tell them before you touch it. This guide follows the notice from the day it is served to the day the award is signed: which of the three notices your loft or extension needs, the two-month and one-month periods, the 14-day reply, what happens when a neighbour dissents, what surveyors cost, and why it can add three months to a project if it s
LCCL Construction
Nov 27 min read
Loft Conversion Building Regulations: What Building Control Actually Inspects
Planning permission gets the attention, but building regulations are the approval every loft conversion needs, whatever the planning route. This guide walks through what the building control inspector checks on site, visit by visit: the steels and floor, the fire-protected escape route and fire doors, the staircase, the insulation, the ventilation and electrics, and the completion certificate you hand to a buyer's solicitor when you sell.
LCCL Construction
Nov 28 min read
Permitted Development vs Planning Permission: Which Route Is Better for Your Loft or Extension?
Every loft and extension in London goes down one of two roads: permitted development, where the design stays inside national limits and the council only confirms it, or a planning application, where the council decides. Neither is always better. This guide compares them on what you can build, what it costs, how long it takes, the risk of refusal and what happens when you sell, with the cases where the smaller permitted development scheme beats the bigger one you would have to
LCCL Construction
Oct 307 min read
Does a Garage Conversion Need Planning Permission? The Four Checks for a London House
Most garage conversions in London need no planning application: turning an attached garage into a room is internal work, and bricking up the door is a permitted alteration. Four things change that answer — a planning condition on a newer house, an Article 4 direction, a listed building and a flat. This guide runs the four checks, explains what building control will inspect, and gives the from-price.
LCCL Construction
Oct 306 min read
5.0
average rating is 5 out of 5
“We did a 3x10m single storey rear extension with LCCL recently. It was scheduled to take 12 weeks to complete but with Alex's experience and agile project management, we are ahead of schedule (finished in 10). Alex, and LCCL,is extremely knowledgeable and…”
Galichet Christophe · Google Reviews
5.0
average rating is 5 out of 5
“Hired LCCL Construction to design and build us a rear house extension. Found them easy to work with and are pleased with the results. They have been recommended to us for the whole build including designs and construction. The rear extension feels amazing,…”
James Grimsdale · Google Reviews
5.0
average rating is 5 out of 5
“I highly recommend LCCL Construction. From the start of discussing ideas and planning I can tell you they were very professional and efficient. I had my kitchen and loft done a year ago now and am absolutely thrilled! Exactly what I wanted!”
Nadya Christou · Google Reviews
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