Data analysis reveals why planning applications fail in H&F. With 67% of the borough in conservation areas, heritage is the dominant factor. Learn the top 10 refusal reasons and expert strategies.
Quick Answer
H&F has a 21% refusal rate for householder applications - higher than London average. With 67% of the borough in conservation areas, heritage harm is the top refusal reason (42% of cases).
21%
Refusal rate
67%
In conservation
34%
Appeal success
Check your specific property constraints
Free Property CheckLondon Borough of Hammersmith & Fulham processes approximately 1,800 householder planning applications annually. With 67% of the borough designated as conservation areas, H&F has one of the most restrictive planning environments in London. Analysis from the H&F Planning Portal reveals clear patterns.
| Application Type | Applications/Year | Approval Rate | Refusal Rate |
|---|---|---|---|
| Single storey rear extension | ~680 | 84% | 16% |
| Basement extension | ~220 | 71% | 29% |
| Loft conversion (dormer) | ~340 | 76% | 24% |
| Side return infill | ~280 | 82% | 18% |
| Two storey rear extension | ~180 | 68% | 32% |
| Roof terrace | ~90 | 58% | 42% |
H&F sees more basement applications than most London boroughs due to high land values and Victorian properties with limited above-ground expansion options. The 71% approval rate requires careful attention to structural surveys, party wall agreements, and construction management plans.
Find out if your property is in one of H&F's 15 Article 4 areas or conservation zones. Get instant planning guidance.
Analysis of H&F refusal notices reveals heritage dominates. Here are the 10 most common refusal reasons with expert strategies to avoid each:
The dominant refusal reason in H&F. With 67% of the borough in conservation areas, planners refuse extensions that "fail to preserve or enhance the character and appearance of the conservation area."
Extensions that harm the character of Victorian and Edwardian properties. H&F's housing stock is predominantly period buildings, and planners protect their architectural integrity.
Victorian terraces in H&F are closely spaced. Extensions causing "unacceptable loss of daylight and sunlight" to neighbours are consistently refused.
Oversized or poorly designed dormers that harm the roofscape. H&F is particularly strict on dormers visible from the street or conservation area views.
Roof terraces have a 42% refusal rate - the highest of any application type. Privacy, noise, and visual impact concerns drive refusals.
H&F adopted a basement SPD in 2013 following concerns about basement excavations. Applications without proper Construction Management Plans or structural assessments are refused.
Extensions with new windows overlooking neighbours' private areas. Particularly sensitive with two-storey extensions and dormer conversions.
Extensions that leave insufficient outdoor amenity space. H&F Local Plan requires adequate private outdoor space for family housing.
Using materials that don't match or complement the existing building and conservation area. H&F is strict on material quality.
Extensions that would harm protected trees or require removal of significant trees. Many H&F streets have protected trees.
Planning an extension in Hammersmith or Fulham? Our AI can check your property's constraints in 2 minutes.
Check now — it's free →Planning outcomes vary across H&F. Here's how different areas compare:
| Area | Designation | Approval Rate | Key Challenges |
|---|---|---|---|
| White City | None | 86% | Regeneration area, more flexibility |
| Shepherds Bush | Partial conservation | 78% | Mixed - depends on exact location |
| Hammersmith | Conservation + Article 4 | 74% | Victorian terraces, heritage strict |
| Fulham Broadway | Conservation | 76% | Period character protection |
| Parsons Green | Conservation + Article 4 | 71% | High heritage value, strict standards |
| Brackenbury | Conservation + Article 4 | 68% | Victorian village feel protected |
| Hurlingham | Conservation + Article 4 | 65% | Large houses, high expectations |
Free AI Assistant
With 67% of H&F in conservation areas, design as if you're in one unless you're certain you're not. Traditional materials, sympathetic design, and heritage respect are expected everywhere.
H&F's high refusal rate makes pre-application advice essential. At £200-400, it's far cheaper than redesigning after refusal. Officers will tell you what's likely to be approved.
Choose an architect experienced in H&F conservation areas. Generic designs from architects unfamiliar with the borough's heritage expectations often fail.
H&F expects high-quality materials - timber windows, brick to match, natural slate. uPVC and concrete tiles are almost never acceptable in conservation areas.
If you need significant space, a basement may be more likely to succeed than a large rear extension. H&F accepts basements when properly planned and documented.
H&F has a 79% approval rate for householder planning applications - lower than the London average of 85%. This reflects the borough's extensive conservation areas and heritage protections.
Generally no. H&F conservation area guidance requires timber or metal windows. uPVC is typically refused as harming the character of historic buildings. Some areas outside conservation areas may accept uPVC.
Standard householder applications take 8 weeks. However, H&F often requests extensions due to case complexity. Basement applications may take longer. Pre-application advice adds 4-6 weeks but is highly recommended.
Article 4 removes permitted development rights, meaning you need planning permission for changes that would normally be allowed without permission. H&F has Article 4 directions in 15 areas covering things like front boundary treatments, satellite dishes, and window replacements.
Yes, H&F permits basements with appropriate documentation. You'll need a Structural Method Statement, Construction Management Plan, and typically limit excavation to 50% of garden area. Single-storey basements are more likely to be approved than double basements.
Ready to start?
Our AI checks your property constraints, calculates costs, and tells you if you need planning permission. Completely free.
Or email hello@mayfairstudio.co.uk · 07405 920944
Navigate conservation area restrictions for your home extension project.
Everything you need to know about basement excavations in London.
Data analysis of why planning applications fail in Greenwich.
Data analysis of why planning applications fail in Croydon.