Double Storey Extension Before and After Explained and Revealed

23 February 2023 | Construction, General

Is a 2 storey extension worth it?

Is a 2 storey extension worth it

Imagine walking into your home and feeling a sense of spaciousness, freedom, and tranquility. Imagine having enough room for everyone in the family to have their own private space, while still having common areas for shared activities and relaxation.

Imagine having a home that is tailored to your specific needs, where you can work from home, entertain friends, or simply unwind after a long day.

If this sounds like a dream come true, then a 2 storey extension is definitely worth considering. Not only does it offer more space and functionality, but it also provides an opportunity to create a truly unique and personalized living environment.

Double Storey Extension Before and After Cost

With a double storey extension, you can not only expand your living space but also add value to your home.

And let’s not forget the added benefits of a double storey extension. With a second storey, you can enjoy breathtaking views, more natural light, and better ventilation.

Plus, you’ll have the freedom to design your home in a way that suits your style and needs, without having to compromise on space or functionality.

So if you’re looking for a way to upgrade your home and create a space that truly reflects your lifestyle, a 2 storey extension is definitely worth the investment. With its cost-effectiveness, added value, and endless design possibilities, you’ll wonder why you didn’t do it sooner.

What is the average cost of a double storey extension?

What is the average cost of a double storey extension?

Do you dream of having a spacious and luxurious home, but find yourself struggling with a lack of space and functionality? A double storey extension could be the perfect solution for you!

With the ability to add significant value to your property and maximize your living space, it’s no wonder that so many homeowners are opting for this popular extension option.

But how much does a double storey extension actually cost in the UK? The answer is that it varies widely depending on a number of factors, including the materials used, the size of the extension, and the location of your property.

On average, you can expect to pay anywhere from £1200 to £2200 per square metre for a double storey extension, on top of the cost of ground floor space which is around £1800 per square metre.

Double Storey Extension

Of course, this is just a ballpark figure, and your actual costs could be higher or lower depending on a range of variables. For example, if you opt for high-end finishes and bespoke furniture, you can expect to pay more. Additionally, there are a number of additional fees associated with the extension process, such as planning submission fees, architectural design fees, and party wall agreements, which can add up quickly.

Despite the potential costs involved, a double storey extension can be an excellent investment in your property, providing you with valuable space and functionality that can increase your home’s value and make it more enjoyable to live in.

So if you’re considering a double storey extension for your home, don’t let cost hold you back – with the right planning and design, it could be the best decision you ever make.

What is the cost difference between single and double storey extension?

What is the cost difference between single and double storey extension?

Ah, the age-old question: to build up or build out? When it comes to extending your home, there are pros and cons to both single and double storey options. But let’s talk about what everyone wants to know: the cost difference.

On average, a single-storey extension in London and the South East of England will cost around £1800 – £2400 per m², while in the rest of the UK, prices are closer to £1400 – £2000 per m². Adding a second storey on top of a ground-floor extension will cost an additional 50% of the single storey extension.

So, is it worth it to spend the extra money on a two-storey extension? Well, it ultimately depends on your budget, location, and personal preferences.

But, with a two-storey extension, you can add more space on both the ground and first floor, potentially adding a bedroom or bathroom upstairs and a kitchen, dining area, study, or lounge downstairs. This added space could potentially increase the value of your home and improve your lifestyle.

Double Storey Extension Costs

On the other hand, a single-storey extension will cost less and can still provide you with additional space for a variety of purposes such as a bedroom, lounge, dining room, or gym. The build will also be simpler, requiring less time and potentially fewer complications.

So, while the cost difference is significant, it’s important to consider all factors and consult with a designer to determine which option is the best fit for you and your home. In the end, it’s not just about the cost, but the value and benefits that the extension will bring to your life.

How much value does a double storey extension add?

How much value does a double storey extension add

The value added by a double storey extension can vary depending on several factors such as location, size, quality of materials used, and the design of the extension itself. According to research, a double storey extension can add up to 20% to the value of your property, which is a significant increase.

However, it’s important to note that this figure is not set in stone and can vary based on a range of factors. Additionally, while a double storey extension may come with a higher price tag than a single storey extension, it can also provide you with more living space and may be more cost-effective in the long run.

Ultimately, the best way to determine the potential value added by a double storey extension is to consult with a professional who can assess the specifics of your property and provide tailored advice.

How deep do foundations need to be for a double storey extension?

How deep do foundations need to be for a double storey extension

When it comes to building a double storey extension, one of the most crucial elements to consider is the foundation. After all, the foundation provides the support and stability needed to ensure your new structure stands strong for years to come.

As a general rule of thumb, the depth of the foundation for a double storey extension should be at least 200mm. However, the exact depth will depend on a range of factors, including the type of soil on your property, the weight of the new structure, and the local building codes and regulations in your area.

To determine the exact depth of the foundation required for your double storey extension, a thorough site assessment will need to be carried out by a qualified structural engineer or builder. They will take into account all of these factors and more, to ensure the foundation is strong and secure enough to support your new structure.

While it may seem like a small detail, getting the foundation depth right is essential to the success of your double storey extension project. By investing the time and resources to ensure a strong foundation, you can rest assured that your new space will be safe, secure, and built to last.

Does a 2 storey extension require planning permission?

Does a 2 storey extension require planning permission

Whether or not a two-storey extension requires planning permission depends on a variety of factors, such as the size and location of the extension, as well as local planning regulations. In some cases, a two-storey extension may be able to be built under permitted development rights, which means you won’t need to apply for planning permission.

However, if your extension does not meet these requirements, you will need to apply for householder planning permission before you can begin building.

This can involve a longer wait time and consideration from local planning officers, but working with experienced architects and planning consultants can help ensure that your two-storey extension is designed in a way that meets local regulations and has the best chance of gaining planning permission.

How big can a double storey extension be?

How big can a double storey extension be?

The size of your double storey extension can vary depending on a number of factors, including your local planning rules and the existing layout of your home. However, if you are extending a two-storey house, you cannot go beyond the back wall of the house by over three metres.

It’s important to note that this measurement is taken from the original rear wall of the house, so if you have already extended in the past, this will need to be taken into account. Additionally, the extension needs to be a minimum of seven metres away from the rear boundaries.

This is to ensure that your neighbors are not affected by any loss of light or privacy. It’s also important to ensure that the exterior of the extension uses similar-looking materials to those of the property, so that it blends seamlessly into the existing structure. In any case, it’s always best to consult with a professional architect or planner to ensure that your extension meets all the necessary regulations and requirements.

How long does a double storey extension take?

How long does a double storey extension take?

Building a double storey extension is a significant investment, both in terms of time and money. While the duration of the build will depend on the complexity of the project, it’s essential to be prepared for a longer timeline than a single storey extension.

The good news is that a standard double storey extension can be completed within four to six months, provided there are no unforeseen complications. However, if your project involves bespoke designs or significant changes to the existing house structure, the timeline may be extended.

It’s essential to consider the impact on your daily life during the building process. The noise, dust and other disruptions may make it necessary to move out temporarily. This will add to the overall timeline, so it’s important to factor in any additional rental fees or storage costs into your budget.

It’s also worth noting that once the build is complete, there may be additional work required to redecorate the adjoining rooms, which can take up to a month to complete. All these factors should be taken into account when considering a double storey extension, to ensure you’re fully prepared for the timeline and cost implications of your project.


  • Danielle Stone

    She has been writing professionally for 8 years, with articles published in various print and online publications. She is an avid researcher and strives to bring her readers the most up-to-date information and insights on the topics she covers. Danielle is also an expert on home renovation, interior design and construction, and she loves helping homeowners turn their dreams into realities. When she’s not writing or editing, Danielle enjoys spending time with her family, gardening and exploring nature.

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