Architect in Hillingdon | Loft Conversions, Extensions & Planning
RIBA-aligned architectural design, planning applications and structural engineering in Hillingdon and across London.
Get Your Free Quote
Tell us about your project — we respond within 24 hours
Architect in Hillingdon — Architecture for West London’s Most Diverse Borough
200+ projects completed | 97% planning approval rate | RIBA-aligned practice | 5★ Google reviews
Crown Architecture is a London-based architectural practice with significant experience delivering residential and commercial projects across the London Borough of Hillingdon. London’s second-largest borough by area, Hillingdon stretches from the suburbs of Hayes and Southall on its eastern edge to the rural village of Harmondsworth in the west, taking in the green spaces of the Colne Valley Regional Park and Ruislip Woods. We bring deep local knowledge to every project in this distinctive west London borough.
Why Homeowners in Hillingdon Choose Crown Architecture
Hillingdon’s residential character is shaped by the suburban expansion of the 1930s and 1950s and by the diverse communities that have settled along the Uxbridge Road and the Piccadilly line corridor. The housing stock across UB3 (Hayes), UB4 (Hayes and Yeading), UB5 (Northolt), UB7 (West Drayton and Yiewsley), UB8 (Uxbridge) and UB10 (Ickenham and Ruislip) spans a wide range: modest terraces in Hayes and Northolt, spacious 1930s semis in Ruislip and Eastcote, and larger detached houses in the prestigious Ickenham and Harefield areas.
In UB3 and UB4 (Hayes), the housing is predominantly inter-war and post-war terraced and semi-detached. These areas offer excellent value for money and our clients here typically seek rear extensions and loft conversions to maximise the potential of their homes. The Elizabeth line at Hayes & Harlington has transformed connectivity to the City and beyond.
In UB8 (Uxbridge) and UB10 (Ickenham and Ruislip), properties tend to be larger, often 1930s detached and executive houses with generous gardens. Ickenham in particular is a sought-after village area with its own conservation area and stringent planning expectations. Ruislip — served by the Central and Metropolitan lines — is popular with commuting professionals and families.
A significant planning consideration in Hillingdon is the proximity to Heathrow Airport. Properties in the airport’s noise exposure zones (AW1 and AW2) are subject to specific planning policies regarding noise insulation and the use of acoustic glazing. Our team understands these requirements and incorporates appropriate acoustic measures in project designs.
Hillingdon also has significant areas of Metropolitan Green Belt, particularly in the west and north of the borough. Properties near or within the Green Belt boundary require careful planning assessment.
Our Architectural Services in Hillingdon
Rear and Side Extensions
Extensions are the most popular project across all Hillingdon postcodes. The varied housing stock — from Hayes terraces to Ruislip detached houses — calls for different design approaches. We design extensions that respect the character of the host building and the street while creating the open-plan, light-filled spaces our clients want. We handle all planning applications, prior approvals and building regulations documentation.
Loft Conversions
Hillingdon’s 1930s housing stock is well-suited to loft conversions. Hip-to-gable conversions are particularly popular on the semis of Ruislip, Eastcote and Ickenham. Dormer conversions suit the terraced and gabled stock in Hayes and Northolt. We manage the full design, structural and regulatory process.
New Builds
Hillingdon’s large plots — particularly in Ickenham, Ruislip and the western areas — offer genuine opportunities for new residential dwellings on backland sites and in divided gardens. We carry out planning feasibility assessments before any commitment to a full application.
Ickenham and Ruislip Village Conservation Area Projects
We have experience working within Ickenham and Ruislip Village conservation areas, where design expectations are high and the Council requires sensitive, heritage-led proposals.
Commercial and Heathrow-Linked Projects
Hillingdon’s proximity to Heathrow Airport creates demand for commercial, hospitality and logistics-related projects. Our team has experience navigating the specific planning policies — including aviation safeguarding zones and noise policies — that apply in this part of the borough.
Planning in Hillingdon: What You Need to Know
Planning authority: London Borough of Hillingdon
Planning portal: hillingdon.gov.uk/planning
Hillingdon Council operates its own planning portal and aims to determine householder applications within 8 weeks. Pre-application advice is available and recommended for conservation area and Green Belt projects.
Conservation Areas in Hillingdon
Hillingdon has several designated conservation areas:
- Ickenham Conservation Area — a village conservation area with a distinct historic character. Extensions and alterations within the boundary require planning permission and must respect the rural village character. Article 4 Directions are in force.
- Ruislip Village Conservation Area — covers the historic core of Ruislip village, including the Manor Farm site and the surrounding period properties. A Heritage Statement is required for planning applications in this area.
- West Drayton Conservation Area — focuses on the historic core of West Drayton around the church and manor house, with a mix of listed and unlisted historic buildings.
- Uxbridge Town Centre Conservation Area — covers the historic market town of Uxbridge, with listed buildings including the Chequers public house and the surrounding Victorian commercial and residential streets.
Heathrow Noise Zones
Properties in the AW1 and AW2 aircraft noise exposure zones — particularly in UB3, UB7 and UB8 — are subject to planning policies that require acoustic measures. This can affect the specification of windows and ventilation in extensions and conversions. We incorporate appropriate acoustic design as standard for projects in these areas.
Green Belt
Significant areas of the borough, particularly in the west (Harmondsworth, Harefield) and north (Ruislip Lido area), fall within the Metropolitan Green Belt. Development within the Green Belt is tightly restricted. We confirm the Green Belt status of every project property at the outset.
Case Studies
Double-Storey Rear Extension, Swakeleys Road, Ickenham, UB10 8AX
A family on Swakeleys Road in Ickenham UB10 wanted a double-storey rear extension to create an open-plan kitchen-family room and a fourth bedroom. The 1930s detached house sits near the Ickenham Conservation Area boundary. We produced a heritage-aware design using matching brick and clay roof tiles with traditional proportions. Planning permission was obtained in 8 weeks. The project added 52 sq m and significantly improved the family’s living space.
Hip-to-Gable Loft Conversion, Eastcote Road, Ruislip, UB10 8RE
A couple on Eastcote Road in Ruislip wanted a hip-to-gable loft conversion to create a master bedroom suite with en-suite bathroom and dressing room. The 1930s semi had a classic hipped roof. We designed the conversion with a rear dormer to maximise headroom. The hip-to-gable element required planning permission; the rear dormer was permitted development. Planning was obtained in 6 weeks and the project completed in 12 weeks.
Why Choose Crown Architecture?
- Heathrow noise zone expertise: We design to acoustic standards where required near Heathrow.
- Green Belt awareness: We advise early on Green Belt constraints in the western and northern parts of the borough.
- Conservation area experience: Ickenham and Ruislip Village conservation areas are familiar territory.
- 97% first-time planning approval: Built on thorough policy research.
- Fixed fees, agreed upfront: No surprises.
Frequently Asked Questions
Q: Does living near Heathrow affect my planning application in Hillingdon?
A: Properties in the AW1 and AW2 aircraft noise exposure zones are subject to planning policies requiring acoustic measures — particularly acoustic glazing and mechanical ventilation. Extensions and conversions in these areas need to meet these requirements. We incorporate acoustic design as standard for projects in noise-affected zones.
Q: Do I need planning permission for an extension in Ickenham Conservation Area?
A: Yes. Article 4 Directions in Ickenham Conservation Area remove permitted development rights. Most extensions and external alterations require a planning application and a Heritage Statement demonstrating that the design respects the village character.
Q: Is Ruislip in the Green Belt?
A: Parts of the Ruislip area, particularly around Ruislip Lido and the open land to the north, fall within the Metropolitan Green Belt. Most residential streets in Ruislip itself are outside the Green Belt. We confirm the Green Belt status of your specific property at first consultation.
Q: How long does planning take in Hillingdon?
A: Hillingdon Council’s target is 8 weeks from validation for householder applications. Conservation area applications may involve a heritage officer consultation, which can add a small amount of time.
Q: Can I extend my Hayes terrace under permitted development?
A: In most of Hayes outside conservation areas, permitted development allows single-storey rear extensions up to 3m on a terrace without full planning permission, subject to prior approval. We confirm the position for your specific property at the outset.
Q: What is the Green Belt and how does it affect my Hillingdon extension?
A: The Metropolitan Green Belt is a policy designation that restricts most new development. For existing dwellings within the Green Belt, extensions are permissible if they do not result in disproportionate additions to the size of the original house (generally no more than 40% increase over the original). We advise on the specific policy position at the outset.
Q: Does the Elizabeth line increase the value of extending my Hillingdon home?
A: Generally, yes. The Elizabeth line has increased connectivity and property values in Hayes & Harlington, West Drayton and surrounding areas significantly. Well-designed extensions in these areas are likely to yield a strong return.
Q: What types of planning support documents does Crown Architecture prepare?
A: We prepare planning statements, design and access statements, heritage statements, daylight and sunlight assessments (where required), acoustic assessments (for Heathrow noise zones) and sustainability statements. All are included in our project fee where applicable.
Hillingdon’s Local Character
Hillingdon is served by the Piccadilly line at Heathrow Terminals 2 & 3, Heathrow Terminal 4, Heathrow Terminal 5, Hatton Cross, Hayes & Harlington, Southall (Elizabeth line), Uxbridge and several further stations. The Metropolitan and Piccadilly lines serve Ruislip, Ickenham, Eastcote and Ruislip Manor. The Elizabeth line provides fast connections from Hayes & Harlington and West Drayton to Paddington, the City and beyond.
Key residential areas include the sought-after village of Ickenham with its village green and historic Manor House, the leafy avenues of Eastcote and Ruislip, the developing areas of Hayes and West Drayton, and the handsome residential streets of Uxbridge. Hillingdon’s green spaces are exceptional — the Colne Valley Regional Park, Ruislip Lido, Ruislip Woods, Bayhurst Wood and the Grand Union Canal provide a green setting found in few London boroughs.
Client Testimonials
“Crown Architecture designed a superb double-storey extension for our Ickenham home, navigating the conservation area requirements confidently. We got planning permission first time. Excellent service.”
— Homeowner, Swakeleys Road, UB10
“Used Crown Architecture for a loft conversion in Ruislip. They knew exactly what Hillingdon planning required and the whole process was smooth and professional. Would recommend without hesitation.”
— Homeowner, Eastcote Road, UB10
“Crown Architecture handled our rear extension in Hayes, including the acoustic glazing requirements near Heathrow. They thought of everything and the project was delivered exactly as promised.”
— Homeowner, Coldharbour Lane, UB3
Adjacent Areas We Also Cover
- Architect in Harrow
- Architect in Ealing
- Architect in Hounslow
- Architect in Slough (Berkshire border)
- Architect in Enfield
Get in Touch
Ready to start your Hillingdon project? Contact Crown Architecture today.
Phone: 07443 804841
Email: info@crownarchitecture.co.uk
Website: crownarchitecture.co.uk
We cover the full London Borough of Hillingdon including UB3, UB4, UB5, UB7, UB8 and UB10.