House Extension

Why an orangery is the perfect addition to your home

Firstly, what is an orangery?  

An orangery is a home extension with a glass roof typically covering less than 75% of the overall roof area. As well as, glass walls covering less than 50% of the total wall area.  

Will you need planning permission?  

For planning permission purposes, an orangery is considered as a singles storey extension and are subject to the same regulations. You won’t need planning permission for an orangery if you build within permitted development rights.  

  • It must be under 4m in height and the eaves should be less than 3m high if they are within 2m of a structure boundary 
  • It should not include any balconies, decks or verandas 

How much does it to build an orangery? 

Building an orangery is usually a lot cheaper than building a single storey extension. They are a popular option for people who prefer modern open plan living. They are one of the most affordable ways to create a multi-functional space. The average cost of an orangery costs upwards of £18,000. However, they can be cheaper depending on the size, style, and features you want.  

Are they cold in the winter?  

As the structure is mainly made up of glass, they tend to be cooler in the winter and warmer in the summer. If you are debating between a conservatory or an orangery it is good to know, orangeries have more solid wall and roofing compared to a conservatory. They do retain more heat than a conservatory.  

Why they are a great addition –  

Orangeries add amazing depth to your living space, and they can be extremely versatile. They fill the space with light and have great views of the outside. The open space makes it a perfect area for a dining room or living room to entertain friends and family.  

Orangery ideas – how to add an ultra-chic addition | Livingetc

Learn All About House extension costs in London

When it comes to building a house extension it is often much cheaper than completely moving house. However, London extensions have a premium cost compared to the rest of the UK. One of the main questions asked when planning to do an extension is “how much will it cost?”. So, in this blog, we will help you gain an understanding of the average cost of an extension in London.  

Every extension is different –  

When it comes to extensions many people think that you just build onto the back of your property. But in reality, there are many different types and sizes of extensions and each of them have a different cost. There are many different types of extensions for example:  

  • Front  
  • Rear  
  • Side 
  • Wrap around  
  • Double storey   
  • Or a combination of all of them  

How much does an extension cost in London?   

For a single storey extension in London, you will averagely be looking to pay between £2000 – £3000 per square meter. Whereas, in other places of the UK averagely pay £1300 – £1600 per square meter. So, a 20 sqm single storey extension can start anywhere from £40,000.  If you decide to go for a double storey extension you are looking at paying 50 – 60% more than a single storey extension. Although, it is harder to get planning permission on a double storey compared to a single storey extension.  

You may also need to take into consideration for extra fees such as an architect, planning permission and finishes on the project. All of these factors can increase the price.  

What are extensions in London commonly used for?  

Typically, the houses in London are quite narrow so one of the more common extensions people go for is a rear extension. Depending on the layout of the house this can extend either the kitchen or the living room to create a more open space.  

Why is it so expensive to build in London?  

  • London has more tunnels, including sewers, the tube and, mail rail compared to other cities.  
  • The narrow streets make it difficult to access building sites.  
  • To preserve London’s historical character there are many different levels of the planning rules.  
  • There is a worryingly large amount of unexploded World War 2 bombs scattered all over London.  
  • London also has a higher labour and material costs.  
  • The archaeology of roman ruins in the city also makes it hard for construction to take place.   
House Extensions London | SDA Build London

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How much will a kitchen extension cost in 2022

A kitchen extension is usually at the top of any homeowner’s wish list. Gaining more social space, while also having more room to be able to prepare meals for the family, is some people’s dream. However, one thing that puts some homeowners off the idea is the thought of the cost. So, the numbers that we are going to discuss for a kitchen extension can vary depending on the project.  

What you need to budget for when extending your kitchen –  

Your budget will need to vary depending on the extension you plan to achieve and the finishes you want to use. Furthermore, you need to think about the professional fees such as architects, contractors, etc, and build costs that you will need to budget for. In some cases, you also need to get planning permission and building regulations approval so keep these things in mind too.  

The build costs for the kitchen extension –  

For a small basic extension, the average cost in the UK is around £30,000. However, per square meter, you should be expecting to pay anything from £1500 to £3000. In some cases, you may need to make changes to the foundation of the house. A structural engineer can help you with estimating the foundation costs. 

How much will the professional fees cost –  

The designer will charge a 3 – 7% fee of the overall build cost. You will also need planning drawings for the planning permission which can cost around £2,400 to £3,600. You also need to pay for the survey of your house which will cost you between £500 to £1,500. 

Construction drawings are also required for the construction and building regulations approval. The cost of these drawings is the same as planning drawings. The fees of a structural engineer range from £500 to £1,000. You need one to design the roof, foundations, and any large span openings. 

Will the extension add value to your property –  

Maximum value will be added by improving the main living spaces such as the kitchen, dining, and living area. It has been found that a single-storey extension can add up to 11 – 23%.  

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Can I add a Front extension to my home?

What is a front extension? 

A front extension is commonly seen as a porch. They allow you to add depth and dimension to the front of your home. Whilst shielding it from the elements and adding it for aesthetic purposes.  

Front House Extension Rules to Follow –  

Some of the rules are as follows: 

  • The size of the house extension should not be greater than the land around the house. 
  • You can make an extension higher than the existing roof. 
  • You need to make sure that the materials you are using are the same. 
  • If your house is situated near the public highway; you cannot build an extension under permitted development rights. 

Reasons to extend the front of your home –  

  • Adding a front extension will increase the value of your home. In the UK single-storey extensions are a popular choice and can add up to 5 – 8% value to the property.  
  • If you are looking for more space, it is cheaper to extend your house rather than buy a new one.  
  • Extending the front of your house is often the easiest type of extension. It doesn’t require you to move out of your home. As well as, it may not affect major rooms in the house.  

Will you need planning permission –  

Whenever you plan to add an extension, there are some rules that you need to follow. Like any other house extension, there are some limits on how high, wide, and far you can go. If the design does not comply with these rules, then you have to apply for planning permission. 

Permitted development rules for a front extension –  

  • Does not front onto the road 
  • A single storey 
  • Is at most three meters out from the original house 
  • Is not more than half the width of the original house 

It does not mean that this process is negative. It is just difficult and can make your project stressful. Furthermore, it can take many weeks to complete and will cost you extra money. Anyhow, if you are following the rules then you can skip this process and build an extension. You can add a room to the front of your house without any worry. 

The rules with this type of extension are very strict. The reason is that you are extending towards the front of the house. It means towards a public highway and hence there are stringent rules. 


Adding a two-storey extension to your home

A two-storey extension can be a great way to upgrade your home. It is also one of the more efficient ways to add more space and to increase the property value. While a double-storey extension may seem like a much larger project to undertake than a single storey one. They’re often budget efficient and are a lot cheaper than moving house. 

How big can you build a two-storey extension without planning permission?  

Firstly, the eaves and pitch heights must be no higher than those of the existing house. However, if the building is within two meters of a boundary, the overall maximum eaves height is restricted to 3m. The pitch should match the existing house as much as is practical. 

Under permitted development, you can extend up to three meters from the original house. But it must be more than seven meters from the rear boundary. Any extension to the original house should not exceed more than 50% of the total land around the house.  

How much does a double-storey extension cost?  

The cost of an extension can vary from one place to another in the UK. The cost of labour is different from one city to another. Furthermore, the material you choose has a significant effect on the overall cost of the project. If you go with standard quality material then a double-storey will be around £1,500 per square meter. While a good quality design will cost you around £1,700 per square meter. 

The typical cost of building a two-storey extension starts at around £40,000. But this will increase if you are planning to use some of the space like a kitchen or bathroom. So, with all the finishes included you can expect to be paying around £102,500 to £124,000. 

Will you need building regulations approval to build a two-storey extension?  

Regardless of the size of the extension, you will need building regulation’s approval. You will need a full set of building regulations drawings, structural calculations, and specifications to submit your building control application.  

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Planning a porch extension in Maidstone

Adding a porch extension to your Maidstone home can transform the look of your property. First impressions are very important to some homeowners, so creating a warm welcome to guests is a must. If you’re looking for a bit of extra space to hold your coats and shoes, then a porch would be a great addition.  

Will you need planning permission for a porch in Maidstone?  

If you’re thinking about adding a porch, you might be wondering if you need planning permission. Many, people might think of a porch as a kind of extension or conservatory. However, a porch has its own rules for planning permission. So, a porch doesn’t need planning permission if it follows the permitted development guidelines.  

You do need planning permission if:  

  • The ground area is more than three square meters (including the walls) 
  • The highest point is more than three metres in height 
  • Is within two meters of a boundary and the road 

You may need permission if you live in a listed building, conservation area, or area of natural beauty.  

How much will it cost to add a porch?  

Building a porch extension is a fast and relatively cost-effective way to improve the front of your house. The average porch costs around £3,500. This is for a traditional porch made from bricks, with a tiled roof, concrete floor, and glazed composite door.  

How long does it take to build a porch extension?  

The time it takes to build a porch depends on the materials you choose. A lightweight aluminum porch can take around a week to build. Whereas, a uPVC glazed porch can take around 2 weeks to build. If you choose a more secure enclosed porch such as one that is brick-built it will take around 1-2 weeks to construct.  

Will a porch add value to your Maidstone home?  

Firstly, by adding a porch you are increasing the square footage of your property which will add value to your property. A porch will provide an average return on investment of 84%. The cost and return varies by region, as some places are more suitable for a porch than others.  

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Advice Center, Extensions

Common mistakes made by people when extending their home

Extending your home is a big project and can cost you a lot of money. So, here is a list of common mistakes that you may want to avoid.  

Having an unrealistic schedule  

It is common knowledge that building work can be unpredictable and can take longer than expected. There are some things you can’t just predict or plan. Having an understanding of this from the beginning of the project can help you prepare for delays. For instance, having a positive and chilled attitude will help form a better relationship with your contractor.  

Rushing the design  

If you’ve recently purchased a property or moved into a new home, you should live in the home for a while before extending or renovating. This is so you can get a real insight into what changes you want to make to the property. By waiting a year or so, you can see how the house stands and works throughout the seasons and different weather types.  

Upsetting the neighbours  

You must always inform your neighbours about any renovation that is going to take place on your property. Regardless of whether you get along with them or not. Often building works can be disruptive to your neighbours and their properties. So, to make sure no conflicts occur you should be aware of and get a party wall agreement. The agreement with your neighbours usually takes place in letter form and can be done by a third party such as a party wall surveyor.  

Going over your budget  

Running out of money when you are halfway through a project can be one of the worst things that can happen. This is why ensuring that you get fixed quotes and estimates from the beginning is vital. Before you start your project, it is important to have a contingency fund available just in case anything unexpected comes up.  

Not researching tradespeople properly  

It can often be tempting to choose a cheap builder so you can save a bit of extra money. However, employing a skilled professional is a good investment, so you can avoid unfinished or bad-quality work. You should choose a trade person based on their previous work and trusted recommendations.  

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Thanet: What Extensions Are Good For You

One of the best ways to raise the value to your home or to add to space is to add an extension in Thanet. There are many extensions you can have. For example, adding a single-storey, side or double-storey extension. 

Types of extensions  

  • Side return 
  • Rear 
  • Single-storey 
  • Double-storey 
  • Front 
  • Wrap around  

Rear extension 

This extends out from the side of your home and combines with the back of your property. This gives a lot of extra space and is a great project for those wanting a larger kitchen area or an open floor plan. 

Side return extension  

Providing you own the side of your house, building a side extension to the side can have a huge impact on your home. It will make your home look larger. 

Wrap around extension 

If you cannot decide between a side return and rear extension, why not have both? This is a combination of the two. 


When wanting as much space as possible a double-storey extension would be the best for you. It means you can have an additional or bigger living space and have an extra room upstairs.  

Will an extension add value to your home in Thanet? 

On average the homes in Thanet are sold on an average of £282.000. An extension can raise the value of your home by 5-15% depending how much work you’ve decided to put into it. £282.000 raised by 15% is £324.300.  

Planning permission 

Some extensions will not need full planning permission and can come under permitted development before construction you should find out what it falls under before starting to prevent your local council from taking action. If you build without following the planning rules you can be told to fix it so it complies or they can force you to demolish the work that’s been done. 

Building Regulations  

Regardless if you need full planning permission or not you will need to follow the building regulations. Building regulations have set standards: 

  • Fire safety  
  • Energy efficient  
  • Damp proofing 
  • Ventilation 
  • Structural integrity  
  • Anything else that will ensure health and safety. 

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Extensions: Things You Should Keep In Mind

Are you thinking about creating an extension on your home? this is one of the best ways to create extra space or additional rooms in your home. Here is some information on extensions you should think about.

Rear Extensions  

A rear extension extends from the rear of your house into the garden space. It’s a great option for someone that’s wanting to extend their kitchen or have an open floor plan. 

Side Return  

A side return extension is an extension that is built at the side of your home. This extension can make your home look larger. 

Wrap around extensions  

A wrap around extension is a rear and side return extension combined together making a large space. If you cannot decide between one or the other, why not have both! 


A double-storey extension gives you additional living space and an extra bedroom upstairs. The advantage to this is that you get double the space but it doesn’t double the cost. Normally a double-storey only cots around 50-60% more than a single-storey. 

Things You Should Think About Before Starting Any Extension  

Will adding an extension to your home increase the value? 

Constructing this project will add value to your home, it has been known to raise the value by 5-15%. How expensive the build is depending on the value. How much the value will be depends on:  

  • The quality of the work 
  • What additional rooms you’ve created 
  • Is it modern?  

Have you got enough budget? 

Having a realistic budget is very important. Without a budget there’s no project. While many know about the material and labourer fees people often don’t know or forget about these hidden fees such as: 

  • Legal fees  
  • Stamp duty and land tax 
  • Measured surveys 
  • Architecture fees 
  • Structural engineer fees 
  • Planning application fees 
  • Building regulation fees 
  • Warranty  
  • Services  
  • Waste removal 
  • External works 

There will most likely be more fees that will come along with it, so make sure your prepared. 

Do you have permitted development rights? 

Permitted development allows you to extend your home without planning permission. There is a number of guidelines your project will need to follow and not every home will come under those guidelines, meaning they will need a full planning application. Here are some of the projects you can build under permitted development if your home qualifies: 

  • Rear extension  
  • Side return  
  • Two-storey
  • Garage conversion 
  • Loft conversion  
  • Annexe 
  • New additional storey  

You still need to be aware that if you decide to do a complex project it could become a chance that you may need a full planning application. It depends on the work you decide to do. 

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All there is to know about extensions in Sevenoaks Kent

If you are looking to build an extension in the Sevenoaks, are you have come to the right place. Building an extension is a journey. Your build journey will be unique to you and your home, so it is important to plan and manage it well for it to be successful.  

What is an extension?  

An extension is a great way to add additional space to your home, without moving properties. On average the cost of a house extension in Sevenoaks is a lot less compared to if you were to move to another location that offers more space.  

Are extensions in Sevenoaks worth it?  

If an extension provides you with the space, you need and is going to improve the quality of the way you live then it is definitely worthwhile. In addition, extending your home can also be a cost-effective investment that will pay back on itself when you eventually sell.  

Sevenoaks house value increase 

Single-storey extensions are most commonly used to extend kitchens and/ or living rooms. With open plan living becoming hugely popular with homeowners in the UK. Single-storey extensions can often add 5-8% to the value of your home. Whereas, creating a double bedroom and an En-suite can add up to 23% to the value of the property.  

Planning rules have changed  

In recent years the government has relaxed planning rules in regards to extensions. The changes have given homeowners more flexibility to improve and increase the value of their homes. Previously, without planning permission, you could add a single-storey extension of up to 3 meters in depth for an attached property and 4m to a detached house, these distances have been doubled. 

How much does an extension cost in the Uk?  

  • Small rear extension (15m2) costs around £15,000 – £20,000 
  • Medium rear extension (25m2) costs around £30,000 – £40,000 
  • Large rear extension (50m2) costs around £50,000 – £60,000 

Get in contact with us –  

If you are looking for someone to provide excellent advice and support in and around the area of Sevenoaks. Here at Pro Arkitects we will provide you with the best possible services.

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