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House extension comes with a variety of advantages which makes it easy to see why the extension could be a fantastic uptick in the possible price of your building in regards to sales. So if you're aiming to build a brand-new residence extension yet still not convinced about the project, we're here to help you. Being completely conscious any home building work is usually a heavy investment, there's a substantial requirement to be set on your choice before arranging the start of any type of work. So are house extensions worth it? Below are several of the leading advantages provided by house extensions to assist you make a decision if it's one of the most appropriate course for you.

 

What's Associated with Including an Extension?

The actions will differ relying on the scope of your extension, yet you can expect some, if not all, of the below to be involved when including an expansion to your residence:

 

  1. Getting Building Regulations or Planning Permission (if called for as the extension is larger than permitted development).
  2. Inspecting your leasehold arrangement (if appropriate) to make sure you can do what you intend to do.
  3. Getting an architect  to prepare the plans, considering your intended use ( cooking area, washroom, research study).
  4. Hiring a competent builder with experience of larger projects.
  5. Calling your insurance coverage supplier to let them know of the planned job ahead of it beginning.
  6. Getting auto parking permits if required for your service providers to guarantee they have very easy access to your residential property.
  7. Making sure all planned work falls within allowed allowables.
  8. Clearing up the space and excavating if essential, including the elimination of trees.
  9. Structure work can start.

 

What is the cost of a house extension in city?

If you're thinking about adding a two floor house extension, after that setting a allocate this task would be a terrific means to begin. Similar to a rear extension, a 2 storey extension usually leaves the remainder of the structure needing some job and also, due to its dimension, this may indicate the re-development of the whole house - which is why they can be very expensive. A few of the other influencing aspects that can have large impact on a 2 storey house extension expense includes: your location, the size of the construct, complexity of the design (anything beyond the conventional build will normally need even more competence and time), the glazing to be integrated (the a lot more the glass used in the task, the more the material expense), as well as the team used.

Average House extensions cost in Channel Isles

The regular cost of House extensions are £50,000 in Channel Isles. Costs vary based upon the materials and the company picked. The upper price range can be as high as £68,000. The material costs are in most cases around£10,500.

Average price per House extensions job in 2025

Avg. price low

Avg. price low
£42,000

Avg. price

Avg. price
£50,000

Avg. price high

Avg. price high
£68,000

£68500

£51375

£34250

£17125

£0

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

House extensions installation cost in Channel Isles 2025

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

House extensions searches in March 2025

House extensions Projects in Channel Isles in February 2025

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Requests for quotations in Channel Isles in February 2025

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Requests for House extensions quotations in Channel Isles in February 2025. 0% change from January 2025.

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Requests for House extensions quotations in in February 2025. 0% change from January 2025.

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

House extensions searches in cities and towns near Channel Isles February 2025

House extensions near you

Channel Isles

The Channel Islands are situated in the English Channel with a population of approximately 160,000. Having a small land area, the Channel Islands possess a large population density of 2,187 individuals per square mile. Whilst the islands are situated near to the Normandy Coast, they are still part of the British Crown Dependencies including Guernsey, Jersey and six additional inhabited islands. For all household upgrades you're looking for for your property on the Channel Islands, assess quotes from reliable businesses to get the ideal price.

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House extensions pros in Channel Isles

CMK Home Extensions LTD

2 review(s)
Based: in Glasgow, G61 3NU

The alternative to traditional domestic builders CMK Home Extensions bring a modern, professional approach to all your home improvement and extension needs. Whether its a new open plan living space, kitchen diner, family room or sun room we can trans...

Latest review

M M., G12
30th July 2016
4

House Extensions in Glasgow

This company has been very pro active in discussing the work to be done whilst waiting for my building warrant.

Similar Customer Enquiries for House extensions in Channel Isles

21 Apr

House Extensions

St Lawrence, St Ouen, St Mary, St John, Trinity, Grouville - JE3

Enquiry from: Luke W

Start Date: Immediate

A single story extension to the rear of the property approx 25m2, fit kitchen, outfit a utility room with electrical points and plumbing for washing machine etc. Plumbing for a toilet in utility room....

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21 Jan

House Extensions

St Lawrence, St Ouen, St Mary, St John, Trinity, Grouville - JE3

Enquiry from: Steve B

Start Date: Immediate

12x8. Lean to, with slates. Granite work to front and side. Wooden door and window. To be a kitchen.

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29 Dec

House Extensions

St Helier, St Clement, St Saviour - JE2

Enquiry from: Jonny B

Start Date: Immediate

Two storey extension. Kitchen/diner, downstairs shower room, upstairs bedroom (possibly en-suite)

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18 Oct

House Extensions

St Helier, St Clement, St Saviour - JE2

Enquiry from: Lauren B

Start Date: Immediate

Extension from kitchen/ diner where a shed is now.

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12 Aug

House Extensions

St Helier, St Clement, St Saviour - JE2

Enquiry from: Jennifer C

Start Date: Immediate

Extend kitchen out back , potential balcony from first floor bedroom and make most of the ground floor open plan.

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03 Mar

House Extensions

St Helier, St Clement, St Saviour - JE2

Enquiry from: Tracey B

Start Date: 1 to 3 months

increase the size of existing extension and add a proper roof Are you the property owner: Owner of the property Looking For: Single storey extension Do you have planning permission: Yes Do you have pl...

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24 Feb

House Extensions

St Lawrence, St Ouen, St Mary, St John, Trinity, Grouville - JE3

Enquiry from: Sandra D

Start Date: Immediate

Extension at the back of the house to include downstairs & upstairs.

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07 Jan

House Extensions

St Helier, St Clement, St Saviour - JE2

Enquiry from: Tim S

Start Date: Less than one month

To extend above the garage and utility room which has a flat roof. To extend above to create a master bedroom and en suite to be inline with the main house. . Are you the property owner: Owner of the ...

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28 Dec

House Extensions

St Lawrence, St Ouen, St Mary, St John, Trinity, Grouville - JE3

Enquiry from: Mike O

Start Date: Immediate

One story extension flat roof with roof windows 10M x 5M. longest side all bi-fold doors. to be breakfast room and kitchen

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17 Nov

House Extensions

St Helier, St Clement, St Saviour - JE2

Enquiry from: Denis L

Start Date: Immediate

A single story extension (10m x 5m) Are you the property owner: Owner of the property Property Type: Detached Looking For: Single storey extension Do you have planning permission: No Do you have plan...

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20 Jun

House Extensions

St Lawrence, St Ouen, St Mary, St John, Trinity, Grouville - JE3

Enquiry from: Christine A

Start Date: Immediate

Extension to west wing to include, first floor entrance, staircase, lounge, extension to existing bedroom and bathroom 2nd floor bedroom , walk in wardroabe and bathroom . - demolish bedroom and ...

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18 Feb

House Extensions

St Helier, St Clement, St Saviour - JE2

Enquiry from: Vishal S

Start Date: 1 to 3 months

Are you the property owner: Owner Have you considered getting your windows replaced to match a new conservatory: No Other Forms: 45 Agreed to recieve quotes for selected products: Yes Please call to ...

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06 Nov

House Extensions

St Helier, St Clement, St Saviour - JE2

Enquiry from: Sam T

Start Date: Immediate

We currently have a conservatory which we would like to make solid build and have an extended part of our lounge.

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10 Jul

House Extensions

Vale, Saint Andrew - GY6

Enquiry from: R H

Start Date: Immediate

Install a large window in the end gable of a double garage, build an internal staircase at the towards the back of the garage for access to the first floor loft. Convert the centre of the loft into an...

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24 Apr

House Extensions

Saint Martin - GY4

Enquiry from: C J

Start Date: Immediate

Single storey kitchen and utility, flat roof, replace drainage. Easy access, plans passed and ready to start.

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18 Feb

House Extensions

St Helier, St Clement, St Saviour - JE2

Enquiry from: Keith H

Start Date: Immediate

Extension to the rear of the property approx. 3mtrs x 6mtrs. Pitched roof with 2 x velux windows. The rear to be mainly full length windows and either Bi-fold or French doors. Also 1 x door to the si...

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FAQs

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.

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.

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.

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Channel Isles House extensions installers are rated 4.6 out of 5 based on 13 reviews of 91 pros.
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