A basement conversion is the perfect alternative if you’re unable to extend your home upwards or outwards. They are a unique way to create that much-needed extra living space. Basement conversions are designed as a multi-functional, practical area for you to entertain and relax. A Basement conversion is a cost-effective way to extend your home, without an overwhelming transformation to your property exterior. Typically basements sit close to the main living space, so they are highly versatile when it comes to how you use it.
If you think a Basement conversion would be a worthwhile investment for your home, here is our advice and tips on how to convert a basement.

Basement in new construction home with stone fireplace
How much does it cost to convert a Basement?
If you’re looking for a cost-effective solution to extending your living space, a basement conversion is a great option. Especially if you’re unable to create extra space above-ground, a basement conversion is a perfect way to increase your building as well as add value to your property. It will work out cheaper if there is no excavation required (uncovered/cut through).
The cost of a basement conversion can vary depending on the job needed. As an example, a conversion of an existing cellar would cost approximately £750 – £1,400 per square metre. Whereas lowering the floor level and underpinning an existing cellar would cost around £1,500 – £2,000 per square metre.
Do I need Planning Permission?
A basement conversion can bring your home ideas to life, offering that much-needed extra space for storage or entertainment. In the majority of cases, planning permission is not needed when converting an existing basement. However if you need to lower the floor level of a basement to increase the ceiling height, you may need to get planning permission.
Create a Checklist
Are there any additional features you need to think about? For example, how easy is it to access your basement? Whatever property you live in, it is important to have convenient and safe access from inside the house, such as a stairway that meets the basement or an exterior entrance which provides access to the extended space. Is there sufficient lighting in your basement? There are a variety of lighting solutions to create the desired atmosphere you want to achieve. Another way to improve the lighting is by installing new windows, replacing old ones or removing any obstructions from entering existing windows. A similar option would be to install a glass door that leads to the basement, this will introduce light from upstairs.
Waterproofing System
For extra protection, you need to think about a suitable waterproof system for your basement conversion. There are three main solutions, these include a Cavity Drainage Membrane pump system, a Barrier system such as a tanking system or a simple Floor Sealant. The most effective way to waterproof a basement conversion is by getting a professional company or individual to complete it. This will ensure a waterproof method that meets your requirements.
How to prepare for basement waterproofing
- Clear out your basement
- Clean your basement, removing any debris, dirt and dust
- Make sure the walls are not damaged. If so, you may need to fill in holes or dents.
Choose your Design and Layout
Before you carry out your basement conversion, you need to decide a suitable design and layout scheme. This involves a full survey of the property to assess floor structure, roof options and entrance options. Whether you’d like something more traditional or contemporary, there are endless basement arrangements to choose from.
Pale colours work best to let floods of light in the room. Due to access being limited – flat-pack furniture is the best option for converted basements – to easy assemble in the room. You may also want to consider other features such as steps up to the garden or an additional external entrance.
In terms of floor structure, alterations may be required in order to obtain suitable head room. All design agreements will require Building Regulations approval, even if it is changing an existing basement. This ensures your new basement conversion is safe and energy efficient.
Best ways to Insulate a Basement
By insulating your basement conversion, it will ensure high performance thermal efficiency. This will save you money on heating bills, as well as helping to keep the air moisture-free in your living space. There are many affordable external insulation, these include a Vapour Control Layer which prevents water vapour from the basement rooms.
What Flooring is ideal for a Basement?
When it comes to browsing flooring options, underfloor heating is a popular choice. This is an efficient heating method, evenly spreading heat across the basement ground. To fix an uneven floor, there are other options available such as additional screeds, with a concrete layer on top which will raise the height of the flooring.
Why Choose Rowing Restorations?
Rowing Restorations provide quality Basement and Cellar Conversions in the Essex and Suffolk areas. In addition, we offer a FREE bespoke survey and expert advice while on-site. All of our basement conversions come with a 10-year backed guarantee, for your peace of mind.
Contact our specialists on 01255 861973 or email us rowingrestoration@btinternet.com for more information regarding our basement conversions.