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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 £51,875 in Erith. Costs vary based upon the materials and the company picked. The upper price range can be as high as £72,000. The material costs are in most cases around£10,500.

Average price per House extensions job in 2025

Avg. price low

Avg. price low
£34,250

Avg. price

Avg. price
£51,875

Avg. price high

Avg. price high
£72,000

£72500

£54375

£36250

£18125

£0

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

House extensions installation cost in Erith 2025

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

House extensions searches in June 2025

House extensions Projects in Erith in May 2025

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17

Requests for House extensions quotations in Erith in May 2025. 13% change from April 2025.

120

Requests for House extensions quotations in Kent in May 2025. 9% change from April 2025.

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

House extensions searches in cities and towns near Erith May 2025

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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

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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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23 Feb

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Erith - DA8

Enquiry from: Kingsley O

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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 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

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Erith - DA8

Enquiry from: Mark O

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*Homeowner House extension Please call to appoint

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23 Jun

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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

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Erith - DA8

Enquiry from: Adebisi A

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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

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Erith - DA8

Enquiry from: Cee M

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Kitchen extension

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28 Nov

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Erith - DA8

Enquiry from: Charles R

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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

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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

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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

how much does a two storey house extension cost?

If you’re considering adding a two storey house extension, then setting a budget for this project would be a great way to get started. Similar to a rear extension, a two storey extension usually leaves the rest of the building needing some work and, due to its size, this may imply the re-development of the entire house - which is why they can be very costly. Some of the other influencing factors that can have big impact on a two storey house extension cost includes: your location, the size of the build, complexity of the design ( anything beyond the standard build will normally require more expertise and time), the glazing to be incorporated ( the more the glass used in the project, the more the material cost), as well as the team used.

Generally, when it comes to extensions, the major part of the expenses will be made on the build of the project. This is because it doesn’t only cover the material cost but also the contractor’s overhead as well as the daily rates. At this stage, the extension prices can be determined by the standard of the work that’s being done.

For a fairly average room size of about 18 square metre, the two storey extension should cost within the range of £2,500 to £3,000 per square metre - with the range being determined by the finishes incorporated. Therefore, a two storey extension of about 18 square metre should cost within the range of £45,000 to £55,000. However, this is with the assumption that there are standard window sizes, bathroom suits are modest, and without any need for any purpose joinery or glazing. If you wish to include all these extra features you’ll also have to pay more to make the total cost between £70,000 to £80,000.

how much is a double house extension?

A double house extension is basically a construction to any aspect of your house that elevates up to offer two floors of space. It can be structured to suit your existing home in two storeys or as a side wing on a taller property. If you’re considering building a double house extension, then estimating the cost is a very important task to do before commencing the project. In this article, we’ll give you an idea of the cost of a double house extension so you can estimate yours accordingly.

The double house extension cost depends on several factors that’s specific to your home as well as your design choice. These includes:

• Location of your property. Places like London and the southeast will generally cost more than the other regions due to higher demands.

• Accessibility of the site. The ease of your site’s accessibility also plays a key role in the price.

• Size of the extension. The more the extension’s size in footprint and square metres, the higher the possible costs.

• Materials used in making the roof as well as the complexity of the roof design.

• Your choice of finishing. These includes flooring window and door frames, glazing, underfloor heating and roof lights.

• Your property’s soil type. Different types of soil requires varying treatments as well as materials to develop solid foundations.

Constructing a double house extension is a quite simple build in terms of technicality when its to the side or rear of your house as this can also help you save some money. Generally, considerably expanding your home’s space by building a double house extension will cost within the range of £1,500 per m2 to about £2,800 per m2.

how big can my house extension be?

The holy grail of home extensions is basically the need for additional space for living as well as leisure. However, before commencing your home extension project, you’d probably want to know just how big your new building can be. In this article, you’ll find the answer to this question which is also frequently asked by many other home or property owners in the UK.

Besides your budget, there are two other major influencing factors that can determine just how much extra room that can be added. These factors include whether you wish to carry out the extension project under Permitted Development rights which is usually for a smaller project or you’d prefer to opt for a larger project which is covered by Planning Permission.

Apart from the limitations in the size of an extension under Permitted Development, the extensions are also a lot more affordable and consumes less time when compared to the extensions under planning permission. So what exactly is the size limit for an extension under Permitted Development and the ones under Planning Permission?

For a single storey extension, the maximum size that can be constructed without having to submit an application for Planning Permission includes:

• An extension should have a maximum length of 6m, if you reside in a terraced home or a semi-detached property.

• Extensions for detached properties can have a maximum length of 8m.

• The extension built must not go beyond half your garden’s area.

• The extension should have a maximum height of 4 metres, but in the event whereby the extension is situated within 2 metres of the boundary of your property, it should not exceed a height of 3 metres.

• The extension should not be higher than the highest part of the existing house’s roof.

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.

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