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Kitchen extension with a white island, navy cabinets, parquet floor, a rooflight and bi-fold doors open to a small walled garden

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

37 minutes ago8 min read

Tile-hung walls and a new white window on a hip-to-gable loft conversion, photographed from the scaffold during the build

Loft Conversions in Harpenden AL5: Hip-to-Gables on the 1930s Houses, Dormers on the Edwardian Villas, St Albans Planning Rules and Prices

Harpenden's houses are mostly between-the-wars semis and detached houses with hipped roofs, with Edwardian villas around the Common and Victorian terraces near the station — and each gives a different loft. This guide covers which loft suits which Harpenden house, where St Albans City and District Council's conservation areas change the permitted development answer, who inspects the work and what a loft costs inc. VAT, with the Hertfordshire project we built as the example.

LCCL Construction

51 minutes ago7 min read

Rear of a white-rendered house with a dark zinc-clad rear dormer and a glass Juliet balcony above, and open glazed doors from the kitchen onto a patio with garden furniture and shrubs

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

52 minutes ago7 min read

Aerial view of a dark-clad top-floor loft addition with a roof terrace, railings and glazed doors on a brick period house, slate roofs and trees around it

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

54 minutes ago7 min read

Open-plan kitchen and living room in a rear extension with a vaulted ceiling, two rooflights, a marble-topped island with black bar stools and bi-fold doors to the garden

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

1 day ago6 min read

Dining table with black chairs inside a rear extension, bi-fold doors folded fully open onto a garden with trees and a parasol

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

2 days ago8 min read

Open-plan kitchen and living room inside a rear extension with a vaulted ceiling, two rooflights, a marble-topped island with black bar stools, herringbone wood floor and bi-fold doors to the garden

House Extensions in Welwyn Garden City AL7 and AL8: Garden City Rules, the Estate Management Scheme, Permitted Development and Prices

Welwyn Garden City is two towns with two rulebooks. The original garden city — Handside, Sherrardspark, the roads off Parkway — sits inside a conservation area and the council's Estate Management Scheme, so even a permitted development extension needs consent to its appearance. The post-war neighbourhoods to the east follow the ordinary permitted development rules. This guide explains both, what each extension costs inc. VAT and what building control inspects.

LCCL Construction

2 days ago8 min read

Finished loft bedroom with a double bed, white walls, a rooflight, built-in shelves and glazed doors with a balcony rail

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

2 days ago7 min read

Flat-roofed rear dormer loft conversion with grey cladding, a glazed door and a small balcony, seen from above with neighbouring slate roofs around it

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

2 days ago8 min read

Finished loft bedroom with a dormer window, fitted white wardrobes along the sloping wall and a radiator under the window

Loft Conversions in Potters Bar EN6: Hip-to-Gable and Dormer Lofts on the 1930s Semis, Permitted Development and Prices

Potters Bar is a town of 1930s semi-detached houses with hipped roofs, which makes it hip-to-gable country: the loft type that turns a sloping end into a full-width bedroom and bathroom, and that is almost always permitted development. This guide covers what the Potters Bar housing stock allows, where The Royds conservation area and the Green Belt change the answer, what Hertsmere and Hertfordshire Building Control look for, and what each loft type costs, design and build, in

LCCL Construction

4 days ago7 min read

Rear of a London brick terrace with a single-storey extension under construction, the shared brick walls to both neighbours exposed and scaffolding to one side

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

4 days ago7 min read

Loft en-suite shower room with large grey porcelain tiles, a walk-in glass shower screen, black fittings and a wall-hung basin under a mirror

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

4 days ago8 min read

Rear of a 1930s semi-detached house with a finished single-storey brick extension and grey bifold doors opening onto a lawn

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

Attached single garage with a white up-and-over door on a 1930s semi-detached house, before conversion

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

Cedar-clad flat-roofed garden office with glazed doors at the end of a London terrace garden, a lawn and sleeper beds in front

Garden Room Permitted Development Rules 2026: Height, the 2 Metre Boundary Line and the 50% Garden Test

A garden room or outbuilding is permitted development on most London houses, but the rules are precise and three of them are measured in metres: 2.5 m high within 2 m of a boundary, 4 m for a pitched roof or 3 m otherwise beyond that, and no more than half the garden covered. This guide sets out the Class E rules as they stand in 2026, the conservation area and Article 4 exceptions, when building regulations apply, and why a garden office is fine but a garden bedroom is not.

LCCL Construction

Oct 306 min read

Red Budget box on a desk beside a scale drawing of a London house with a rear extension

What the October 2026 Budget Means If You're Planning a Loft or Extension in London

John Healey delivered his first Budget on Wednesday 28 October. There was no line in it headed 'home improvements', but a good deal in it bears on anyone deciding whether to add a loft or an extension to a London house next year: stamp duty left alone, VAT left alone, inflation and wages for 2027, the energy measures, and a tax rise for landlords. Here is what was actually announced, where it was announced, and what it means for a project.

LCCL Construction

Oct 298 min read

Single-storey rear extension with roof lantern and sliding doors on a 1930s detached house in Mill Hill NW7

Prior Approval and Neighbour Objections: What Happens When the Neighbours Object to a 6 m or 8 m Extension

The larger home extension route lets a 6 m extension on a terrace or semi, or 8 m on a detached house, go ahead without a planning application — unless a neighbour objects. This guide explains exactly what happens when one does: the 21-day consultation, the single test the council is allowed to apply, what an objection can and cannot achieve, how long the decision takes, and the three ways forward if prior approval is refused — including the 3 m or 4 m extension that needs no

LCCL Construction

Oct 288 min read

Extension drawings laid out on a table by the window of a London house, ready for pricing

House Extension Plans: The Four Sets of Drawings You Need, Who Draws Them, When and What They Cost

Every house extension in London runs on four sets of drawings, and most of the delays and surprises on a project come from one of them being missing, late or drawn by the wrong person. This guide explains what each set is for — planning or Lawful Development Certificate drawings, building regulations drawings, the structural engineer's calculations and the construction drawings — who produces it, in what order, what it costs, and what a quote priced from the wrong set leaves

LCCL Construction

Oct 288 min read

Single-storey rear extension on a London semi-detached house with matching brick, flat roof, roof lantern and aluminium sliding doors

Semi-Detached House Extension Rules: What You Can Build at the Back, the Side and Upstairs Without Planning Permission

A semi-detached house has one free side and one shared wall, and the permitted development rules treat them differently. What you can build on a semi without a planning application: a 3 m rear extension as of right, 6 m by prior approval, a single-storey side extension up to half the width of the original house, and a two-storey rear extension where the garden is long enough — with the height and boundary limits, what the shared wall means for the party wall, and the from-pri

LCCL Construction

Oct 289 min read

Three London terraced houses each with a different single-storey rear extension on a sunny day

Article 4 Directions in London and Hertfordshire: Which Boroughs and Streets Have Lost Permitted Development Rights

An Article 4 direction removes permitted development rights from a street, an estate or a whole borough, so a loft or extension that would normally need no planning application suddenly does. This is the list: every London borough we work in and the Hertfordshire councils, which directions are in force, what they cover, and what it means for your project — taken from each council's own schedule and verified in September 2026.

LCCL Construction

Oct 268 min read

What clients say

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5.0

average rating is 5 out of 5

“I highly recommend LCCL Construction. They completed our loft conversion to a very high standard, and the quality of their work throughout was excellent. The team was professional, reliable, and completed everything within a very reasonable timeframe. They…”

Alina A · Trustpilot

5.0

average rating is 5 out of 5

“Extension built by LCCL Construction. We have just recently completed our ground floor house extension on our semi-detached home in Finchley. The services we used were for the design and build of the extension which is three meters and the full breadth of…”

EVA HALL · Trustpilot

5.0

average rating is 5 out of 5

“We are very happy with the services from Lccl, Alex has done a great job on design and construction. We have used Lccl in the past for our rear house extension and have come back to instruct Lccl for our loft conversion too to our house in North London. As…”

Mia M · Google Reviews

Aleksandar Madari (Anderson), founder of LCCL Construction

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