Extensions & Loft Conversions in Essex
Thoughtfully Designed Extensions and Loft Conversions for Homes Across Essex
House Extension Design
Loft Conversion Design
We design home extensions that create more space and improve the way your home works. Whether you’re dreaming of a larger kitchen, an open-plan living space, or an extra room for the family, we work with you to create a design that feels natural and perfectly suited to your home.
A loft conversion is a great way to make the most of unused space. We design lofts that feel bright, comfortable, and fully connected to the rest of your home — ideal for bedrooms, home offices, or a quiet space to relax.
Planning Permission & Permitted Development
Building Regulations & Technical Drawings
Planning can sometimes feel complicated, but we’re here to guide you through it. We prepare the drawings, handle applications where needed, and work with local planning authorities to help move your project forward smoothly.
Once the design is agreed, we produce clear technical drawings ready for construction. These give builders everything they need to price and build your project accurately, ensuring it’s safe, compliant, and built as intended.
What Our Customers Think
"CET designed our side / garage extension, was very helpful on site and clearly has an eye for working within site constraints and foreseeing potential issues."
Joe Palmer
"CET have helped us with 2 projects now and have been excellent both times... I will use CET again and would recommend them to anyone."
Lee Gurton
"We had a great experience using CET... Would 100% recommend."
Daniel Gracie
"Can't recommend CET Architectural Designs enough! Charlotte is very professional and very helpful, the best! I'm a very happy customer."
Gladis Woods
FAQs
How much does an extension or loft conversion cost?
The overall cost will depend on factors including the size and complexity of the project, specification, structural requirements and the existing property. Developing the design and technical information before construction can help you obtain more accurate quotations from builders.
Do I need planning permission for a house extension?
Not always. Some house extensions can fall within Permitted Development rights, while larger or more complex extensions may require a planning application. We can review your property and proposed design to help determine the appropriate route.
Do loft conversions need planning permission?
Many loft conversions can be undertaken under Permitted Development rights, subject to specific limits and conditions. Planning permission may still be required in some circumstances, including where Permitted Development rights are restricted or the proposed design falls outside the relevant criteria.
Do I need Building Regulations approval for a loft conversion?
A loft conversion will generally need to comply with Building Regulations. These cover areas such as structural safety, fire safety, insulation, stairs and other aspects of the construction. We can prepare the technical drawings required for this stage of your project.
Can you design the extension and handle the planning application?
Yes. We can take your project from the initial survey and design concepts through to the preparation of planning drawings and submission of the relevant application where required.
What type of extension would work best for my home?
This depends on the existing property, available space, planning constraints, budget and what you want to achieve. We explore different options during the design process rather than assuming that one type of extension will work for every home.