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House Extension in city

House extension includes a wide variety of benefits which makes it simple to see why the extension could be a excellent uptick in the prospective rate of your property in terms of sales. So if you're aiming to construct a new house extension yet still not encouraged regarding the project, we're below to help you. Being fully aware any home building job is typically a heavy financial investment, there's a massive need to be set on your decision prior to arranging the start of any kind of work. So are house extensions worth it? Below are several of the leading advantages used by house extensions to assist you make a decision if it's one of the most suitable route for you.

 

What's Associated with Building an Extension?

The actions will certainly differ depending on the range of your extension, but you can expect some, if not all, of the listed below to be involved when including an extension to your home:

 

  1. Getting Building Regulations or Planning Permission (if required as the extension is larger than permitted development).
  2. Examining your leasehold agreement (if relevant) to see to it you can do what you want to do.
  3. Enlisting an architect  to prepare the plans, considering your planned use ( cooking area, restroom, office).
  4. Hiring a competent builder with experience of larger projects.
  5. Contacting your insurance policy supplier to allow them recognize of the prepared job ahead of it starting.
  6. Getting car park allows if required for your professionals to ensure they have simple accessibility to your property.
  7. Seeing to it all intended job falls within permitted allowables.
  8. Clearing up the area as well as excavating if necessary, consisting of the elimination of trees.
  9. Building job can begin.

 

What is the cost of a house extension in city?

If you're thinking about adding a two storey house extension, after that setting a allocate this project would be a excellent way to get started. Comparable to a rear extension, a two floor extension normally leaves the remainder of the building requiring some job and also, due to its dimension, this might indicate the re-development of the entire house - which is why they can be very expensive. A few of the various other affecting factors that can have big effect on a 2 floor house extension cost consists of: your location, the size of the develop, intricacy of the layout (anything beyond the basic develop will usually require more expertise and time), the glazing to be incorporated (the much more the glass used in the project, the much more the product expense), in addition to the group utilized.

Average House extensions cost in Erith

The regular cost of House extensions are £50,500 in Erith. Costs vary based upon the materials and the company picked. The upper price range can be as high as £69,600. The material costs are in most cases around£10,500.

Average price per House extensions job in 2026

Avg. price low

Avg. price low
£33,400

Avg. price

Avg. price
£50,500

Avg. price high

Avg. price high
£69,600

£70100

£52575

£35050

£17525

£0

Prices based on actual House extensions costs for Erith, as reported by local LeadsDoWork members.

House extensions installation cost in Erith 2026

Labour cost £27,000
Material cost £10,500
Waste removal £2,500
Time frame: 10-14 weeks

House extensions searches in June 2026

House extensions Projects in Erith in May 2026

3,626

Requests for quotations in Erith in May 2026

17

Requests for House extensions quotations in Erith in May 2026. 13% change from April 2026.

120

Requests for House extensions quotations in Kent in May 2026. 9% change from April 2026.

Source: Numbers calculated based on the search volumes in major search engines

House extensions searches in cities and towns near Erith May 2026

17

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10

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Erith

The London town of Erith features a population of slightly over 100,000, undergoing a good deal of modernisation ever since the '60s. Erith has several residential regions, specifically apartments and council blocks with fewer shops and business properties. Make the most from your house and use vetted, reliable firms in Erith to undertake the work.

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House extensions pros in Erith

Jassi Builders Ltd

2 review(s)
Based: in Hayes, UB4 9YD

Hi Jassi Builders LTD here, I am a specialist in planning, designing and building control services. I make sure that I have completed all my work on perfect time and leave customers in complete satisfaction. We do all types of loft conversions, exten...

Latest review

Julian F., HP2
4

House Extensions in Hemel Hempstead

No quote received

Dream the Build

19 review(s)
Based: in London, EC1V 2NX

DREAM the Build. Ltd ' Constructing your Vision Making home development exciting, fun and asset building experience , future proofing household & investors Who we are ? Starting fresh in a new country is never easy, but what we did Catal...

Latest review

Patricia Z., SE21
5

House Extensions in London

Great consultation by Catalin Spent a lot of time with us understanding the project and various options.

Options Home Improvements LTD

1 review(s)
Based: in Kent, ME8 0DB

Here at Options Home Improvements we specialize is the bespoke design & installation of PVCu & Aluminium, windows and doors, orangeries & conservatories in Gillingham, Kent & South East area. Options Home Improvements was started due to the seemi...

Latest review

Lisa V., ME1
5

House Extensions in Rochester

I haven't had the extension built yet but am planning to use them

Nicholas James Construction

7 review(s)
Based: in Bromley, BR1 3AX

From past fifteen years we have been established as the finest building and construction service provider to clients in Bromley and its surrounding areas.

Latest review

Jagdish K., HA3
5

House Extensions in Harrow

Absolutely pleasant appointment. Very patient and polite, listened carefully to detail and more of my background and his...

Similar Customer Enquiries for House extensions in Erith

20 Mar

House Extensions

Erith - DA8

Enquiry from: John N

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Customer made enquiry for House Extension quotes online. Homeowner lives in Erith area. Please call to arrange appointment

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14 Oct

House Extensions

Erith - DA8

Enquiry from: Aaron F

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Customer made an online enquiry for House Extension via one of our websites. Confirmed via . Please call to arrange an appointment to quote.

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01 Nov

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Erith - DA8

Enquiry from: Bola A

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Homeowner House extension Please contact to appoint

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23 Feb

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Erith - DA8

Enquiry from: Kingsley O

Start Date: Immediate

are you the property owner: owner have you considered getting your windows replaced to match a new conservatory: no other forms: house extension agreed to receive quotes for selected products: yes pl...

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24 Jul

House Extensions

Erith - DA8

Enquiry from: JUSTINA A

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are you the property owner: owner have you considered getting your windows replaced to match a new conservatory: no other forms: house extension, none agreed to receive quotes for selected products: ...

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18 Jul

House Extensions

Erith - DA8

Enquiry from: Mark O

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*Homeowner House extension Please call to appoint

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23 Jun

House Extensions

Erith - DA8

Enquiry from: James T

Start Date: 1 to 3 months

2 storey Extension to the rear of the house that would be adding a 4th bedroom upstairs and extending kitchen and bathroom downstairs. Would want fitted bathroom and kitchen included. Customer is cu...

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30 Apr

House Extensions

Erith - DA8

Enquiry from: Carlene B

Start Date: Less than one month

Home Owner Extension Please call to appoint Are you the property owner: Owner of the property Looking For: Double storey extension Property Type: Semi detached Do you have planning permission: Yes ...

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12 Apr

House Extensions

Erith - DA8

Enquiry from: Janet S

Start Date: 1 to 3 months

Homeowner Please contact to appoint

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09 Apr

House Extensions

Erith - DA8

Enquiry from: Adebisi A

Start Date: Immediate

Are you the property owner: Owner of the property Other Forms: 45 Agreed to recieve quotes for selected products: Yes Please call to appoint

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30 Mar

House Extensions

Erith - DA8

Enquiry from: Cee M

Start Date: Immediate

Kitchen extension

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28 Nov

House Extensions

Erith - DA8

Enquiry from: Charles R

Start Date: Immediate

Brick layer that can build me a 22m2 house extension

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22 Oct

House Extensions

Erith - DA8

Enquiry from: Charles R

Start Date: 1 to 3 months

A 3.4 X 5.4 one storey house extension. Are you the property owner: Owner of the property Looking For: Single storey extension Property Type: Semi detached Do you have planning permission: Yes Do you ...

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17 Aug

House Extensions

Erith - DA8

Enquiry from: Andi B

Start Date: Immediate

2 storey extension on the side of a concrete house Are you the property owner: Owner of the property Property Type: Semi detached Looking For: Double storey extension Do you have planning permission:...

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21 May

House Extensions

Erith - DA8

Enquiry from: Eugenia J

Start Date: Immediate

Are you the property owner: Owner of the property Property Type: Terrace Other Forms: 45 Agreed to recieve quotes for selected products: Yes Please call to appoint

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28 Nov

House Extensions

Erith - DA8

Enquiry from: Sujan S

Start Date: 3+ months

Single story extension at the rear for the kitchen

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25 Sep

House Extensions

Erith - DA8

Enquiry from: Mide A

Start Date: Immediate

two storey rear extension

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17 Sep

House Extensions

Erith - DA8

Enquiry from: Agostin G

Start Date: Immediate

High quality of work,bathroom and kitchen included. Property Type: Semi detached Are you the property owner: Owner of the property Looking For: Double storey extension Do you have planning permission...

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22 Apr

House Extensions

Erith - DA8

Enquiry from: Valarie B

Start Date: Immediate

home owner rear extension - advice required as to one or two story semi detached 2 story house time scale - immediate please call to appoint *

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11 Nov

House Extensions

Erith - DA8

Enquiry from: Trudy C

Start Date: Immediate

Property type: Terrace, Work description: Single storey 5ftx12ft flat roof side of house over drains. Call to appoint

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FAQs

where to start with a house extension?

Have you decided to improve your property instead of moving? The common problem most homeowners face after deciding to embark on a home extension project is not knowing where to start. In this article we’ll walk you through everything you need to consider and put in place before commencement of your home extension project.

• Is the extension worth it?

Before breaking the bank, you must be sure that the project will add good value to your home. In terms of “value, this is not only limited to the financial gain after disposal of the property, but also several other juicy benefits to be derived from extending your home like an extra living space for the household to spread out and more.

• Do you need a planning permission?

Check with your local authority to determine whether or not you’ll require to submit an application. You can also consult a building expert like an architect for advice.

• What are the building regulation?

Even though planning permission can be dodged, you can not avoid building regulations. These regulations are the set national minimum standards for construction and design which you must comply with to ensure the safety of the individuals in and around it.

• Who will design the extension?

You have to decided whether you’ll hire a professional architect to design the extension or not.

• Who will manage the building work?

If your home extension project is designed and built by a professional company, they’ll be responsible for the management. However, if you decide to use an architect or designed it yourself, you’ll have to hire a main contractor to manage the build.

• How to set the budget?

There are so many factors that can affect the cost of an extension, so it’s better to get the costs from your builder before proceeding.

• Do I need yo inform my home insurance firm?

Absolutely! This is very important as the new extension may affect the rebuilding cost of your property which could have an impact on the policy premium.

• Do I need to inform my neighbours?

It’s very important to discuss your plan with your neighbours before applying for a planning permission and communicate about the concerns they might have.

Do I need my neighbours’ permission for an extension?

Well the reality is, sometimes, neighbours just don’t get along. With several individuals living in close proximity, it’s little surprise they tend to get on one another’s nerves from time to time. However, there’s a difference between having a tiff and being able to transform your house the way you want without having to obtain your neighbour’s approval.

The short and simple answer to this question is, not necessarily. However, you must first educate yourself by thinking about your extension and how it affects the houses around you. We’d strongly recommend you talk proposals through with your neighbour so as to avoid possible conflicts later. There are a number of reasons why your neighbour can protest to your new home extension plans. Let’s take a look!

 

  • In the event whereby your new extension is blocking their view or providing an unwanted shade on their property. Here, they have a legitimate reason to protest as no one would want their once sunny garden suddenly covered or plummet into shade.
  • In the event where it leads to a loss of privacy. For instance, if your new extension possesses a window which overlooks the neighbour’s property in any way. This is likely to be taken as an invasion of privacy and that has a little to no chance of being a welcomed idea.
  • If it’s a major project and going to take a lot of weeks before completion. The noise generated, especially when your neighbours are enjoying your summer holidays or weekends, can make their gardens not as relaxing as it used to be.
Can an extension add value to my home?

Yes. Most extensions will add substantial value to your home, and you may find that the extension adds more value than it cost. However, it’s important to be sure that the home remains balanced. Extending your garage and leaving your property with no parking spaces, for example, may impact your ability to sell.

when do you need planning permission for a house extension?

If you’re planning on adding a house extension to your property, you’d probably be worried about whether or not your proposed extension would require a planing permission. Well, it may be relieving to know that not every house extension project would require a formal consent, and in fact, several extensions are covered by the permitted development rights. Not only can this save you a considerable amount of time especially at the project’s planning phase, but it’ll also save you money on the application fee. In the UK, single storey extensions to the house’s rear can be 3 metres deep for both semi detached houses and terraces or 8 metres deep for detached homes.

So how do you know when you’d require a planning permission for your home extension? Well, if your extension plan fits these criteria explained below, then your project is most likely going to be allowable as a permitted development.

• Extensions, which includes previous additions, must not go beyond half of the original house’s total surrounding land area.

• The main elevation, or side elevation where it fronts the highway, must not be extended forward.

• For single storeys, the rear additions must not extend more than the original house’s rear by more than 3 metres in both semi attached homes and terraces (4 metres for detached houses).

• Extensions to the side must be a single storey with a height not exceeding 4 metres and not going beyond 50% of the original house’s width.

• Extensions hat within 2 metres of a boundary should have a eaves height not more than 3 metres.

• Multi storey addition must not extend beyond the original house’s rear wall by a maximum of 3 metres or 7 metres of the boundary opposite the rear wall.

• Permitted development rights do not apply in listed buildings or designated areas.

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