House Extensions in London

Our Conversions and House Extension London


Extension Architecture’s work always varies; our projects range in complexity and scale from house extensions and refurbishments to Change of Use and New builds. We are a leading Architectural and Planning practise that specialises in problem solving and maximising space and value for people looking to improve their property. Extension Architecture is able to assist clients at each project work stage, either every step of the way in sequence or as isolated elements. Our services include project inception, planning application consultation and submission, feasibility studies, building regulations and calculations, tender adjudication, contract administration, construction and site supervision. No matter how big or small the project, Extension Architecture can guide you all the way through.


What Type Of House Extension London Work Do We Plan?


At Extension Architecture, we offer a variety of house extension London work, including single and double storey extensions, loft conversions, basement extensions, flat conversions, new builds, change of use and commercial. Due to our expertise and with over 11 years of experience, we are able to work with all property types to deliver an extension and transformation that you have always wanted.

There are a number of reasons why you may want a house extension London, such as improving the efficient of your home, making the space more sociable, but also if your family is extending. Our team of architects in London are able to work with you to ensure that the new design for your property is exactly as you had in mind. Regardless of the shape or size of the project, we can turn your dream into a reality, so you can enjoy more quality time with your family in your home, or make the property work better for you and your life.

For example, loft conversions, are an excellent way to make the most of existing space and make it work for you. A house extension London can be great for using space that is currently being wasted, such as the basement or loft, but can also be a way to create additional space for you to utilise.

How Do We Get Started With A House Extension London?


Whether you have already decided exactly what you want or you would simply like to find out more about the options you have available, the best step to take is to give us a call or send us an email. We can then arrange a consultation with you to outline how we can help you, discuss your ideas and then put together ways that we can transform or extend your existing space. We offer free consultations, so you can get professional advice about your plan. At Extension Architecture, we are also able to give you a free quote for your plan and what you will need. If you would prefer to meet our team and come in for a face to face meeting, we are more than happy to organise a meeting to get started with your house extension London.


House Extensions Frequently Asked Questions

If you are looking to newly build,change the use of your land or building, or for a house extension this means you will need planning permission. A Planning Application includes details of your proposal which is then sent to the Local Planning Authority. LPAs will need to check you application and grant it so that you may start works. Quite simply, it is a way that your local council can check that the proposed development is designed with sensitivity to local guidelines and is suited to the relevant site, street, and area. If we did not have this system in place, we could find buildings that have no uniformity in their designs, form or function. This way, the United Kingdom which is rich in heritage can keep your home as part of it’s identity whilst allowing you to make exciting and necessary changes.

Local Planning Authorities are generally the local council borough and these LPAs will have guidelines and links to explain what are within your rights to make changes to your property. They are usually receptive to pre-applications, but since three years ago, most of the London Boroughs have adopted a fee for their pre-application advise. A good thing to know, no matter if you are doing a small single storey rear extension, a loft converson or a large new build – most LPAs take approximately 6 to 8 weeks to make a decision on your project.

Single-Storey Rear Extensions: The good news is, if you live in a terrced or semi-detached house in 2020, Local Planning Authorities have relaxed the rules and allow for extensions to go to 6 meters . If you live in a detahced house, single storey rear extensions can be up to 8 meters in depth. Just be aware that if your property type is a flat, maisonette or in a conservation area, then you will need full planning permission.

Side Extensions: Side extensions fall under permitted developent if they do not extend more than half the width of the original house. You can extend a maximum of 3 meters as long as it is a single storey extension and does not extend pas the front elevation.

Double-Storey Extension: As of October 2019, new rules are being phased in which will allow homeowners to build extensions onto detached homes without requiring planning permission, under the usual rules of permitted development. This will make adding a two-storey extension to your home no more complicated than having a loft conversion. This doesn’t mean that there is no paperwork involved in undertaking a two-storey extension, but it will make obtaining permission for the extension much simpler.

Loft Extensions: Roof extensions/should be set back, as far as reasonably feasible by at least 20cm from the eaves, unless it is a hip or gable roof (measure the 20cm along the plane of the roof). The roof extension should not hang over the wall of the house.To be a Permitted Development any additional roof space created must not exceed these volume allowances: 40m3 on terraced or emi-detached houses, 50m3 on detached houses

If you believe that your property falls under permitted development, the best way to ensure a positive result is to consult the advice of an Architect to ensure that your extension follows these rules which are applicable to all extensions:

  1. Materials should match the existing house
  2. No raised platforms, balconies, or terraces
  3. Single storey extensions should not be more than 3 meters high
  4. Must not be taller than the existing building
  5. The extension should not take more than 50% of garden space

Permitted Development Rights are a set of policies which allow homeowners greater freedom to add value to their home whether it’s increasing your property price or simply to add floor space. By acting upon these rights you can extend your property to a certain degree, without the need for Full Planning Permission, which can be a more expensive and time-consuming process, as long as you comply with relevant rules.

This generally applies to the single-storey side or rear extensions, loft conversions, front porches, double storey extensions, outbuildings, solar panels, skylights of dormer windows and new windows or doors. However, even Permitted Development has its restrictions and does not cover double-storey extensions, larger loft conversions, flats or properties in conservation areas. Regardless, even if you meet all the requirements for Permitted Development, you will still need to submit your plans to council which they will need to check, and approve.

For a full planning application, you will need good knowledge of the local guidlines, an appropriate design and a full set of accurate architectural drawings. Many Architects will do drawings but not offer extensive planning advice and submit your application on your behalf. On the other hand, Planning Counsultants have expert knowledge of regulations and can therefore play a vital role in obtaining permission for projects with complex needs, but where do both options leave you after your application has been granted…or refused? At Extension Architecture we understand that planning and building involves a lot of head-scratching, that’s why we guide you through the whole process, every step of the way. Extension Architecture specialises in design AND planning consulting and do not charge for submission and liaison with the council. We design, submit planning applications, building regulations with our in-house engineer, construct with trusted buiilders and offer creative interiors with our very own kitchen range. Why bother with the hassle if we can do it all for you?

Building Regulation drawings and control are very important because they insure the safety of people in buildings. Building approval means that your building complies with the national set of standards to protect people’s health and safety in and around buildings. Some examples of what building regulations include are structural calculations, fire-safety, insulation, damp-proofing, foundations, heating, ventilation and accessibilty. Once you have received planning permission, building regulation drawings will have to then be submitted and approved before you can start construction. Just remember, cow-boy builders are always risky business and Local authorities have power under the Building Act 1984 to enforce non-compliant building work altered or removed.

Permitted Development Rights are a set of policies which allow homeowners greater freedom in enlarging their home, granting pre-approved permission. By acting upon these rights you can extend your property to a certain degree, g reater than the norm, without the need for Full Planning Permission, which can be a more expensive and time-consuming process, as long as you comply with relevant rules.

This generally applies to the single-storey side or rear extensions, loft conversions, front porches, double storey extensions, outbuildings, solar panels, skylights of dormer windows and new windows or doors. However, even Permitted Development has its restrictions and does not cover double-storey extensions, larger loft conversions, flats or most properties in conservation areas.

At Extension Architecture, we offer all types of home extensions from Single Storey, Double Storey, Side, and Loft Extensions to Change of Use, Commercial and New Builds. We take our clients all the way right from Site Surveying to the finished result. Our services include:

  • Site Survey
  • Design and Planning Drawings
  • Submission of Planning Applications
  • Building Regulations and Calulations with our in-house Structural Engineer
  • Project Managment
  • Trusted Builders
  • Interior Design
  • Kitchen Showroom
  • Kitchen Supply

Tell us how we can help

Get friendly advice about our professional services including House Extensions, Building Regulation Drawings and Planning Applications

Get an Advice from EA
I am not sure of my plan. I would like to find out through professional advice.
Get an Free Quote from EA
I know what I need for my plan. I would like get a quote from EA.
Call EA
If you would like to speak to us on the phone, please call us on





Book a free video meeting