Architects for Extensions & Planning Applications in Hillingdon
Planning permission, architectural design and project management delivered end-to-end by a multi-award-winning local team.
All In One Architectural Solution In Hillingdon
- Planning applications handled for Hillingdon — council decisions arrive in 8 weeks standard.
- Green Belt and protected land affect extensions — full planning is often required.
- Full design, planning, and building regulations delivered together under one fixed fee.
- Loft conversions available — Velux, dormer, and hip-to-gable options all designed in-house.
- In-house structural engineer included — no separate specialist needed for your calculations.
- A 98% planning approval rate achieved across 34+ completed Hillingdon projects locally.
Extension Architecture handles planning applications, house extensions, and loft conversions across Hillingdon and the wider Hillingdon area, including UB8, UB10, HA4. Many streets keep Permitted Development rights, but Green Belt land often needs planning. Our in-house structural engineer and RIBA-chartered team manage every stage, from survey to completion. Council decisions take 8 weeks. Get your free quote today.
We only deliver excellence
Our Expertise
Planning Application Drawings
Council-ready drawings, fast
3D Visualisations
See it before building
Retrospective Planning
Fix unpermitted works
Building Regulation Drawings
Safe, compliant drawings
Commercial Development Consultancy
Change of use experts
Interior Design
Finishes inside out
Spatial Planning & Layout
Smarter room layouts
Feasibility Consultancy
Know what’s possible
Recent Architects Hillingdon Extension & Loft Conversion Projects
What makes Hillingdon Special?
Hillingdon’s charm lies not only in its green belt and stunning parks but also in its rich architectural heritage. The numerous grade-II listed houses dotting the environment are evidence of Ruislip’s origins as a rural village and they come out at the Duck Pond Market held at the Great Barn where traders in foods and other handmade products dominate the market. You can get food from the market and have lunch in the scenic area among the preserved wildflowers in this historic region.
For those in search of a similar environment, Swakeleys House Georgian manor or anything about Ickenham in more depth, then visitors really get a sense of how people here are able to relax and find solace amidst idyllic countryside and a village market that may not necessarily appear rushed. These historic gems coupled with Hillingdon’s commitment to preserving its green spaces and trees add to the serene vibe without isolating the borough from the contemporary world.
- 1930s semis dominate UB8 — ideal for rear and loft projects.
- Green Belt and protected land restrict development — full planning is usually required.
- Strong local demand means well-designed extensions consistently add lasting property value.
- Hillingdon Council works to a clear 8-week householder planning decision timeline.
What Our Clients Say About
Extension Architecture
Hillingdon Planning Permission for House Extension
Famous for its rigour in planning policies, each submission to Hillingdon Council is examined in granular, meticulous detail. To help assure that they do not need to spend unnecessary time reviewing site plans and architectural drawings, they need precise high quality documentation. As such, it is important that architects offer highly accurate project details from the beginning. Despite these exacting standards, however, Extension Architecture has decades of experience successfully meeting them, from its many high-end residential as well as commercial clients.
Explore before & after visuals of our extension builder projects
Before
Before
After
After
Why Choose Extension Architecture?
One-Stop Solution
Our firm provides a comprehensive range of services under one roof, from planning and architectural design to intricate interior and immersive design, and expertly manages the complexities of the construction process. We have delivered projects of various scales and budgets, from small home extensions to large new builds, for a diverse clientele.
In-house Structural Engineer
Our in-house structural engineer—an advantage that only 1 in 20 firms can offer. This is crucial, as significant time is often lost consulting multiple specialists, which can lead to additional costs. With a structural engineer on our team, we ensure a fully collaborative and seamless design-build process, minimizing contingencies and preventing design inaccuracies.
Interior Design + Architecture
Our team includes interior designers who work closely with the clients, especially the ‘ladies’ of the house to curate the dream spaces tailored to their requirements. These processes include fun yet crucial processes like selecting wall finishes, color schemes, soft furnishings, flooring. Having architects and interior designers under one roof allows for less contingencies.
Turn-Key Approach
We provide support throughout the entire building process, embracing a ‘turnkey approach’ to ensure a smooth and efficient project from start to finish. Additionally, we assist in reducing build costs by aiding in the procurement of all internal fit-outs, including sanitaryware, kitchens, and more. It’s a zero hassle solution for clients.
Start Planning an Extension Home Today
If you are planning a house extension in London, our architects can guide you through the entire process from concept design to construction.
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Any Questions?
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Nikki
Architectural Sales Consultant