An Architect’s Dream: Customisable Architectural Designs at Your Fingertips.
Why Wait?
30 House Types - each comes with a wide variety of already designed:
Back Extensions
Side Extensions
Wrap Around Extensions
Loft Extensions
Porch Extensions
Various styles of extensions to suit whatever need you may have for your project!


Here at PDE (Pre Designed Extensions), we believe in pushing the boundaries of architectural creativity by providing pre-designed solutions that serve as the perfect foundation for your projects. Our subscription-based service offers architects a time-saving way to access pre designed extensions for Semi-Detached and Terrace properties, all of which can be easily customised to meet the needs of your clients.
For a monthly fee, you’ll gain access to hundreds of extension designs for a large variety of house types, available in both Revit and DWG formats. These files include complete existing and proposed plans, elevations, and 3D views, making them an ideal starting point for any project. Simply request the designs, adjust them as needed with your client, and submit them for planning approval. With no watermarks and full editability, you maintain complete control over the final product.
Our service is designed to fit seamlessly into your workflow, giving you the flexibility to adapt designs and save time, without compromising on quality or creativity. Best of all, your subscription can be cancelled at any time, providing the ultimate in convenience and flexibility.
With a vast catalogue of designs available at a minimal cost, PDE provides an efficient and affordable way for architects to meet deadlines and deliver high-quality results. Whether you’re looking for inspiration or a ready-to-use solution, our platform gives you the freedom to focus on what you do best: designing.
Take a peek inside our Catalogue
Take a closer look at what we offer! Below, you’ll find a preview of one Terrace property and one Semi-Detached property from our extensive design catalogue. Each house style comes with a complete range of extension designs. Explore detailed plans, elevations, and immersive 3D views for every design, giving you the full picture of what's possible.
Terrace
Semi Detached

Why PDE?
With PDE, you can simplify your design process and how you quickly you progress from collecting the properties keys to receiving planning permission
01.
Streamlined Process
Our customisable designs integrate easily into your process, speeding up project turnaround and simplifying planning approvals
02.
Scalability
Save time on RIBA stages 1-3, allowing you to take on more clients and increase project capacity without compromising quality
03.
Instant Access
Gain instant access to a comprehensive library of pre-designed extensions, covering a wide range of house styles
04.
No Commitment
Flexible subscription - cancel anytime with no long-term obligations
05.
Fully Customisable
Modify any design to perfectly suit your project’s unique needs
Getting started is easy
With PDE, you can simplify your design process and how you quickly you progress from collecting the properties keys to receiving planning permission
01.
Choose Your Plan
Select the subscription plan that suits your needs and unlock instant access to hundreds of designs
02.
Subscribe and Access
Subscribe for a flexible, no-commitment service and start exploring our extensive design catalogue
03.
Select Property & Design
Identify your property type -Semi Detached or Terrace, and its type - then choose from a range of pre-designed extensions
04.
Download Drawings
Download the detailed, watermark-free drawings, fully customisable to fit your project’s requirements
05.
Submit For Planning
Submit the designs for planning approval yourself, or let us handle the submission for you
Fixed pricing to suit all
We believe in a fair and transparent pricing model - always know what you'll pay. No hidden costs. One flat fee
Bronze Architect Plan
100£Every monthValid for 12 months- Access to Existing Catalogue
- 1 Download Per Month
- Existing Drawings
- DWG Files
Silver Architect Plan
200£Every monthValid for 12 months- Access to Entire Catalogue
- 2 Downloads Per Month
- Existing & Proposed Drawings
- DWG & Revit Files
- Request New Designs For Existing House Types
Gold Architect Plan
300£Every monthValid for 12 months- Access to Entire Catalogue
- 5 Downloads Per Month
- Existing & Proposed Drawings
- DWG & Revit Files
- Limited Revisions
- Request New House Types & Designs
- 10% Discount on Additional Services
It makes sense
We're everything you need on your journey to success as an Architect
PDE
In House
Large Catalogue Of Designs
Requests & Revisions
Low Cost Scalability
Customisable Design
Flexible Cancellation
Reliable & Consistent
Fixed Price & Affordability
Digital Accessibility & Instant Access
Revit & DWG File Access
Visualise Various Designs of the Property
Fast Design Turnaround
Easily Meet All Project Demands


























