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Modular Extension

A to Z Design and Build is the Construction Company in Fulham Supplying Modular Extension, prefabricated.

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Modular Extension 

Our steel base modular house extension system removes the need for foundations (only pads needed), bricklayers, diggers, skips, and pre-mix concrete. Our modular extension system has been designed for fast installation to the highest standards, to reduce time and keep the cost to a minimum.

A to Z Design and Build will design the home extensions accordingly to your desire. We will take the project from design, application to the build itself. 

If you're looking to extend your home, add a rear house extension then our modular house extension system may be the perfect option for you. Designed and build de extension modular unit, delivered to site and installed in under 5 days.

The Modular extension Building is a New system, Unique, and Cost-Effective

Important factors to take into account:


  • The modular Extension will be Designed and Build in our factory

  • The Modular Extension will be fully fitted inside and out in under 5 days (this not includes preparation works)

  • We will design and build the extension to the sizes that will meet your requirements

  • The modular extension system is built to meet the insulation values

  • Match your existing brick/stone

  • 40-year guarantee

Manufactured, and passed through stringent quality control in our unit. Your house extension will be fabricated within 30 days to the highest standard, using millimeter precision engineering. Bespoke sizes, and finishes to your specification.


We will take laser measurements of the existing site and prepare all drawings in the factory. All design details will have to be decided before building the modular extension. 

Our Interior Design team will help you with the decision on the modular extension design. 

For more information you can contact us now:

tel: 07578930828

Rear Home extension

Rear Home Extension Built-in Elephant and Castle

Side Home Extension

Side Home Extension Build in Clapham South 

Our Partners

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Interior Design

Contact our Interior Designer Anastasia Voloshko. She will work with you on making the best decision.


Fresh Air Ventilation

If you want to improve your property by creating a well-ventilated space contact us for advice how to get the fresh air into your property.


Bifold/Sliding doors

Contact A to Z Design and Glass Ltd  for a quote to supply Aluminium, PVC or Schuco Aluminium Bifold or Sliding Doors.

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Bespoke Joinery

If you need any bespoke Joinery like Kitchen, Wardrobes, Cabinets you can contact 4Architects Joinery for a quote: