Fast Plans

Fast Plans: loft conversion and extension drawings in London

Fast Plans is a London-based architectural design service specialising in drawings for loft conversions and house extensions. The company works with fixed prices and offers a package that includes a full property survey, planning drawings, structural calculations and building regulations drawings, with unlimited revisions during the design phase. According to its presentation, it manages the entire planning application process and handles amendments requested by local authorities or building control at no extra cost.

Drawing services and planning management

The company structures its offering into four main services:

• Loft conversion drawings: include structural calculations and are delivered within two weeks. The design aims to maximise headroom and natural light, with advice on layout and storage solutions.
• House extension drawings: range from side-return extensions to wraparound extensions, with full structural details and builder-ready plans. The designs optimise space and circulation while respecting the character of the original home.
• Building regulations drawings: include calculations and technical drawings that comply with regulations, with the aim of avoiding costly errors during construction and saving on external consultants.
• Planning permission drawings: the company manages the complete application, from preparation to submission, and maintains direct communication with council officers. It claims a 98% first-time approval rate.

Fixed-price packages

Fast Plans offers three packages with fixed prices that include VAT. The loft conversion package costs £1,880; the house extension package, also £1,880; and the combined loft and extension package, £3,540. All include a full property survey, full planning or permitted development drawings, complete building regulations drawings with structural calculations, unlimited changes during the design phase and free amendments requested by the local authority or building control. The company highlights that it does not apply additional charges for engineering calculations, nor percentage-based fees, nor limits on the number of revisions.

Work process

Fast Plans' method is organised into four stages. First, a surveyor visits the property to take detailed measurements and assess the conversion potential; the survey is completed within seven days of booking. Second, the first draft design is delivered within 14 days of the survey. Then, once the designs are approved, the company submits the application to the relevant council and manages planning department enquiries. Finally, after approval, it prepares the final building regulations drawings and structural calculations so the builder can start work.

Track record and credentials

Founded by George Kain, Fast Plans began almost 20 years ago as a specialist in loft conversions in London. The company claims over 15 years of experience in residential project design, having completed more than 3,000 projects and maintaining an average rating of 4.9 stars based on over 500 reviews. Its knowledge of local planning regulations and its experience with period properties are central to its proposition.

Publications and resources

The company maintains a section of articles and guides on loft conversions and extensions, covering topics from design trends to technical tips. Among the published content is an article on loft transformation ideas for the modern home, written by the design team and dated May 2025.

Location and contact

Phone: 0208 154 5569 · Email: plans@fastplansuk.co.uk