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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 2026

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 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 Channel Isles in May 2026

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Requests for quotations in Channel Isles in May 2026

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Requests for House extensions quotations in Channel Isles in May 2026. 0% change from April 2026.

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Requests for House extensions quotations in in May 2026. 0% change from April 2026.

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

House extensions searches in cities and towns near Channel Isles May 2026

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

22 Jun

House Extensions

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

Enquiry from: Megan R

Start Date: Immediate

Single story house extension approx 1.2m x 2.8m.

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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 much value does an extension add to your house?

Are you interested in extending your home to create more living space? If yes, then you’d probably want to know how much value it can add to your property in order to compare the building costs to the potential value gain. Well, as long as you know what you’re doing, your house doesn’t necessarily have to be a money pit. So what are your options when talking about home extensions and what’s the associated value to be gained?

• Bathroom Extensions

Although you should have it in mind that bathroom extensions isn’t usually that cheap, but once done, it can increase the value of a standard UK house within the range of £12,000 to £15,000. Meanwhile the finishing cost of a bathroom can range from £2,500 to £7,000.

• Single or Double Storey Extensions

Single storey extensions are always huge when it comes to increasing the value of your home - giving about 4 to 7 percent increase. If it goes that far, then literally nothing beats a full spectrum, double storey extension which can give up to 11 percent increase in the value of a property - equalling about a whooping £33,000 for a standard home in the UK.

• Conservatory Extension

With conservatories becoming more and more popular in the UK due to the weather conditions, several buyers are now including it’s availability as part of the criteria for purchasing a house. Wonder why? This is simply because everyone wants to enjoy their garden all throughout the year. As a result of this high demand, adding this type of extension to your house can go a long way to increase it’s value. However, it’s very important to incorporate high quality materials during construction. With glass conservatories offering, on the average, up to £5,000 increase in value, the cheaper PVC alternative offers much less value and can also deter potential buyers.

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.

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.

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.

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