Welcome to the first in our series of Insights, a new blog in which we explore hot topics, recommend solutions and highlight opportunities. Our first topic is all about basements, because extensions, or conversions, add valuable living space to homes – especially where expanding upwards or outwards is limited.
Are you seeking additional rooms for a growing family, extra storage or a luxury entertainment area? Then a well-designed basement extension can help you achieve your goals. Here we explore the benefits, the types of projects and the challenges involved in their construction and the planning permission process. We also provide examples of successful basement projects, showcasing the potential of this home improvement solution.
Basement extensions come in a variety of shapes and sizes, depending on your needs and the specifics of your property. Understanding the different types of extensions is crucial for determining the right solution for your home, particularly when considering factors such as planning permission and the overall cost of the extension.
This typically involves excavating the ground beneath the house to create a new underground level. This type of extension is ideal for properties with sufficient land space and is often used for townhouses, multi-level residential buildings or properties with limited space for other types of extensions.
Peter Dann designed a basement for a luxury townhouse in Barnes, as part of a five-storey new build. The basement extends deep beneath the property, and was constructed using watertight concrete walls and a temporary sheet-piled retaining wall. It successfully maximises the usable space in a compact urban environment.
Extensions are ideal for creating additional rooms or upgrading existing space to accommodate changing needs. A typical project might involve extending the floor area to increase an open space or create additional rooms.
We are often extending and refurbishing single-level basements, like under this pair of Victorian properties in Battersea. The retrofitted space dramatically increases the usable floor area, showcasing how retrofitting can transform a basement into a valuable part of the home.
In some cases, a basement extension involves refurbishing or retrofitting an existing basement space. This process typically involves reconfiguring the layout or upgrading the structure of an old basement to meet modern standards, increasing headroom or to suit new needs. Retrofitting is a great way to make better use of underused space, transforming an outdated or damp basement into a functional and comfortable living area.
Basement extensions offer significant potential, but they also present unique challenges. Consider the following essential factors before embarking on a basement extension project…
Constructing a basement—whether new or as an extension—requires detailed planning and structural expertise. Soil conditions, water table levels and the existing foundations must all be assessed to determine the feasibility. In areas prone to flooding or high water tables, waterproofing solutions and drainage systems must be carefully designed.
We are currently working on The Hurlingham Project which involves the creation of seven luxurious apartments above a 6.5-meter-deep basement. We are using secant-piled walls to form a watertight structure as the basement sits well beneath the water table and is near to the River Thames. This basement requires precise engineering and planning to ensure it remains dry and structurally sound.
As with any home extension, you must gain planning permission. Basement extensions are subject to local planning regulations and building codes. In some areas, particularly in conservation zones or for listed buildings, there may be additional restrictions on the type of work that you can carry out. Working with experienced professionals who understand these regulations will help you avoid delays or complications with securing permission.
Due to the complexity of work involved, basement extension costs can be significant . Excavating, reinforcing foundations and installing proper drainage systems can all contribute to cost. So, it’s essential you set a realistic budget that allocates sufficient funds for potential challenges. If you’re ready to be quoted for works or need advice, you can get in touch here.
The design can reflect your style whilst meeting the functional requirements of the space. Before starting this project, it’s essential that you obtain advice on the required planning permission to confirm that your project complies with local regulations.
Are you envisioning a cinema room, games room or home bar? Basement extensions provide the perfect space. The soundproof nature of basements can help create the ideal setting for movie nights, while clever lighting and smart home tech can elevate the experience.
For example, Trevor Place – a 19th century terraced property in Knightsbridge – required a basement construction beneath the lower ground floor for the family’s new cinema room and bar, for which we provided structural and civil services.
If you’re looking to create a wellness retreat at home, a basement extension can easily be transformed into a personal gym, yoga studio or spa. Adding a sauna, steam room or hot tub will turn your basement into a sanctuary for relaxation and fitness.
This was achieved at a property on Lonsdale Road, Barnes, where our team designed a basement to house a media centre, gym, sauna and other leisure facilities.
A basement provides the perfect environment for wine storage with the right temperature and humidity. Alternatively, a well-designed storage area can help you declutter and store seasonal items or equipment out of sight.
Cornwall Terrace, a Grade I listed property, required a full refurbishment, including the addition of a basement to house a wine store and a sophisticated plant room. Traditional underpinning techniques were used to form the basement, highlighting how bespoke solutions can address the needs of heritage properties.
Create More Living Space and Boost Property Value with Basement Extensions from Experts.
A basement extension is one of the most effective ways to add space and increase your property’s value. However, it’s important to work with a team that understands the structural and civil challenges involved.
With decades of experience in structural engineering, Peter Dann delivers high-quality basement extensions and refurbishments for new builds across all sectors, including residential and commercial . Our team ensures your project will run smoothly from planning to completion.
Unlock the full potential of your home by getting in touch with Peter Dann today. We’ll offer you expert advice and a quote.