London and Kent Construction Ltd carry out first class building conversions and house extensions in London and beyond.

With two decades of experience the team at London and Kent Construction Ltd have a wealth of building conversions and extensions under their belts, earning us the reputation of being leading conversion specialists in our local area.

With house prices in London and Kent on the rise, a house extension is a viable way of adapting an existing property to suit changing needs or adding value to an investment property. Whether you are considering a loft conversion or extending a ground floor flat or apartment, a chalet or period property, we can guide you through the project, from initial detailed planning and obtaining planning permission to landscaping and interior design.

Because our team members are so skilled, they will be able to offer you advice and input where required based on their qualifications and first-hand experience with previous conversion and extension projects. Just as no two customers are the same, nor are any two buildings and extension developments. We will guide you through the entire process from start to finish, taking into account potential unexpected costs and giving you a realistic quote for the project that you have in mind.

Our team members cover a full range of building and trade skills and we cover postal areas in SE London, Dartford, Bromley and Tunbridge Wells. To find out if we will work in your area or for a free quote, contact us.

London and Kent Construction Ltd provides a total service for all types of house extensions including ground floor flats and apartments, bungalows, chalets and period properties from detailed planning and obtaining the planning permission through to completion and landscaping. Contact us for a free, no-obligation quotation today.

Do you already have plans and planning permission? If so send your extension plans to us for a free no obligation estimate.

If you don’t have plans we can provide you with a qualified architect to work with you on your proposed property extension.

How much will a house extension cost?

No extension is the same. They all vary from property to property so for us to give you the best possible quote for your extension we would have to visit the property to assess the proposed works. We would also always recommend that you get in touch with your local council to see if you can get planning permission.

House Extension – Project 1

This ground floor rear extension was carried out in Colepits Wood Road, London, SE9. Eltham Heights.

Stage 1: House extension foundations and concrete floor over site

The pictures above show the demolition stages through to the preparation of the over site/ concrete floor slab.First of all we cleared the area and excavated to a depth of 1.2 meters for the foundations. Once the foundations were poured we built up to DPC =Damp Proof Course, We then lay hard core to the area and compact it with heavy machinery. This was then blinded with 50mm of sand.

Stage 2: House extension floor construction and brick work to DPC.

We laid a DPM = Damp Proof Membrane down and lapped this onto the DPC course. We then laid 85mm of Celotec insulation over the floor and 35mm up the walls . The floor was then ready for concreting.

Stage 3: House extension cavity walls and pitching the roof

We then built 2 skins of 100mm Thermalite blockwork/block walls up off the DPC with 70mm of insulation clipped in-between. All lintels and cavity closers were installed and we then started to pitch the roof.  The Velux windows were then installed.

Stage 4: House extension roof tiling, facias and soffits and making good to the disturbed areas of the patio.

The roof was felt and battened ready for tiling. All ventilation UPVC soffits and facias were installed along with the guttering. The roof was then ready for tiling and installing the lead flashings.

Stage 5: Insulation, structural openings and stud walls to the house extension.

Now the new extension is water tight we can carry out all structural openings from the extension to the main house. We carefully shored up the walls ready for the removal of the brickwork. The new concrete padstones were installed and the steels were put place. The timber stud frames were then installed left ready for insulation.

Stage 6: Insulation and scratch coat rendering

The stud walls were then insulated with a Rockwall acoustic insulation. The ceiling to the extension was insulated with 100mm of Celotec in between the joists and 50mm of insulation across the ceiling joist left ready for first fix electrics and plumbing.

Stage 7: Plaster boarding and plastering.

Now the extension has had all of its electrics and plumbing installed it is ready to be plaster boarded. We always use the thicker board of 12.5mm. These boards are screwed and not nailed to reduce the plaster from popping and it is a stronger fixing. Once the walls and ceilings are boarded we drill holes in the ceilings and walls to bring the lighting cables through. The same goes with the stud walls for the plug sockets. Now all of the walls and ceilings are ready for plastering.

Stage 8: Decoration and the fitting of a kitchen.

We are nearly there now. All of the walls are lightly sanded to take off any shiny patches as the paint won’t adhere properly to these areas. The walls and ceilings have 3 coats of emulsion paint and the timber work has a primer, 2 coats of undercoat and a finish coat. The kitchen is then installed.

Stage 9: Snagging

Once the kitchen is installed everything is checked to make sure it is working properly. We then carry out any final snagging along with the client and hand the works over as completed.

Stage 10: Completed

A completion certificate, NIC EIC and the GAS SAFE Certificates are issued to the client. Another superb job completed on time and on budget by London and Kent Construction Ltd.

Project 2

This was a rear extension erected in Crown Woods Way Eltham Heights SE9

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Project 3

A house extension on a detached property in North Park, Eltham, SE9

This is a nice detached property in Eltham South East London SE9 on a good size plot but with small rooms.
We extended the living room and dining room into the garden to extend them from 4 meters x 5 meters to 8 meters by 5 meters.
We also added a conservatory to the back of the living room. This house extension was carried out under full planning permission. There were also some major structural alterations carried out to the rear bay. Bays on houses are normally the weak point for moving or subsiding and can sometimes need underpinning.

Finished House Extension
House extension
House extension
House extension

Project 4

This was a 1930s semi-detached built house in Eltham Heights SE9 with an attached garage.
We demolished the garage and erected a garage with the correct size footings to take a second/double storey extension.

House extension
House extension
House extension

Part way through build

We fitted all structural steel work ready for the new concrete block extension to be built on top.

House extension
House extension
House extension
After building the second storey to the extension it was time to pitch the roof. Then all internal knock through and structural alterations to the main house could be completed. By extending the house it gained a bedroom with an ensuite bathroom above the garage.
House extension
House extension
House extension
The roof was now ready for tiling with Redland concrete plain tiles.
House extension
House extension
House extension
Finished pictures of a double storey extension to a tudor style house in Eltham Heights SE9 London.
House extension
House extension
Once these works were completed you could not tell it was a house extension as all of the finishes blended in beautifully. Another great house extension carried out by us builders in South East London.

Project 5

This was a 1930s built house with a detached garage in Riefield Road, Eltham SE9.
We demolished the conservatory and erected a double storey side extension
They gained a bedroom with an ensuite bathroom and a large living room of 10 meters by 4.5 meters.
Just like the project above, once these works were completed you could not tell it was a house extension as all of the finishes blended in beautifully. This extension blended in very well using second hand roof tiles to match existing.This was carried out in Eltham South East London.

Project 6

Wrap around house extension to the side and rear of a semi-detached house in Chislehurst / Petts Wood.

House extension
House extension
This house extension was carried out in Chislehurst, North West Kent.
These pictures show you the semi-detached house with 2 bays before the extension.
These pictures show you the digging out of the foundations
The pictures above show you the extension going up.
We used a mixture of thurmulite blocks and squint bricks to give a different effect on the corners.

This shows you the under floor heating going in.
We also installed a megaflow system.
Once the pipes and trays go in for the under floor heating the floor gets screeded and tiled.

These pictures show you the side and rear extension complete.The builder’s comment.
I love the small details like the creasing tiles used for the window sills and the corner squint brickwork mixed with the flat render, also the double glazed UPVC windows are set in hardwood frames. Although this is a little more expensive it adds character and finishes it off lovely.

Project 7

Extension to a 1930’s house in Colepits Wood Road, Eltham Heights SE9

We were asked to provide a complete building package for the property, that includes us undertaking the planning /building regulations with the structural calculations right through the build to completion.

Once this house extension was finished it blended in great. We used second hand tiles on the roof and you couldn’t even tell it was an extended addition.

Project 8: Contemporary rear addition extension on a Victorian house

These are pictures of a Victorian house in Beckenham Kent.

First it shows you the existing property before any works has commenced.
We then had to remove a lot of the soil as the garden was a lot higher than the original patio areas.
Once we moved the soil we had to put retaining walls in that the client wanted rendered and turned into a seating area/ benches.
We then set out the footprint of the extension and started to carry out the build.
These show the house extension finished.
You can see the back of the retaining concrete walls and benches

Project 9:

First it shows you the existing property before any works has commenced.
We then had to remove a lot of the soil as the garden was a lot higher than the original patio areas.
Once we moved the soil we had to put retaining walls in that the client wanted rendered and turned into a seating area/ benches.
We then set out the footprint of the extension and started to carry out the build.
These show the house extension finished.
You can see the back of the retaining concrete walls and benches
These are the concrete benches that we had built, which also have storage inside them.
The patio area and the seats for the benches will be made out of timber wood decking and are being done at a later date.

This is a shot of the inside of the house extension.
A bit hard to get other photos as it was now full of furniture from other rooms. This was a nice project to construct with the new and old theme.
Sometimes it was hard to meet the new straight crisp edges of the new extension with the old twisted character of the original house, but we got there.

Project 10:

These pictures show how it looked before we started construction on the house extension:

This picture depicts the state of the kitchen before the extension started where there was very little light reaching the room and it clearly needed a makeover into the more modern era, so we completely redesigned the kitchen by adding windows and sky lights as well as making the kitchen appear more open and accessible.

The adjacent pictures show how we dug out the foundations for the extension and created routes for the kitchen pipes go travel through.

The pipes can easily carry through the paths we made.

The picture also shows the almost finished foundations for the extension.

It’s also checked to be water tight.

Construction on the exterior ceiling and removal of old interior ceiling plus the  route for the underground pipes has been established.

Next are pictures of the support beams going up and the preparations to create the ceiling extensions also we opened up the kitchen into a more open planned kitchen to allow easy access to the garden.