Many Fulham streets no longer carry full permitted development rights. That’s the first thing to check before planning any extension here, not the last. Article 4 Directions remove those rights across a substantial number of local streets, and the borough operates one that applies everywhere.
This changes how a project gets planned from day one. What would be an automatic build in another part of London often needs a full planning application here instead. Experienced Fulham architects start with the address, not the brief.
Article 4 Direction and Conservation Area Are Not the Same Thing
These two get confused constantly, and they do different jobs.
A conservation area is a designation for an area of special architectural or historic interest. It automatically removes certain permitted development rights, including side extensions and two storey rear extensions, and it means materials and appearance get scrutinised.
An Article 4 Direction is a specific direction made by the council that removes named permitted development rights within a defined boundary. It can apply inside or outside a conservation area, and its scope varies from one direction to another.
A property can sit inside both, and in Fulham many Article 4 areas overlap with conservation areas. They still have to be checked separately, because clearing one tells you nothing about the other.
Why Fulham Architects Deal With Article 4 So Often
Hammersmith and Fulham has 45 designated conservation areas, including Fulham Palace Road, Brackenbury Village and Hammersmith Grove. That’s extensive coverage for a borough of this size.
There are two layers of Article 4 on top. The council made a borough wide direction restricting basement development on 25 April 2017, which came into force on 26 April 2018 and covers the entire borough apart from the Old Oak and Park Royal Development Corporation area. Separately, the council has removed specific permitted development rights at many individual properties through further directions, particularly within conservation areas, to prevent unsuitable extensions and alterations.
The practical effect is that basements always need a full application, and extensions frequently do. Most of the borough’s housing stock is Victorian and Edwardian terraces, which suit rear extensions, side returns and loft conversions well in layout terms. That same stock is exactly what sits inside the conservation boundaries.
What Happens When Permitted Development Is Removed
A full householder planning application takes over from what would otherwise be an automatic right. The statutory target is eight weeks, and the council’s own guidance says householder applications usually take six to eight weeks once validated, provided nothing complicates them.
Real world timings are longer on constrained sites. Conservation officer consultation typically adds two to three weeks, so eleven to fourteen weeks from validation to decision is realistic. Worth knowing: only around a third of the borough’s householder decisions were issued inside eight weeks in the year to March 2026.
The trade off is favourable on outcomes. H&F granted 98.6 percent of the householder applications it decided over 2025 Q2 to 2026 Q1, against a London average of 85.6 percent. So the borough is slow rather than hostile, which is a very different planning risk to manage.
A full application also lets the council attach conditions to an approval, covering materials or restrictions on future changes. Permitted development carries no equivalent oversight.
What Permitted Development Normally Allows
Where the rights do survive, the limits are specific.
| Extension type | Standard PD limit | Larger Home Extension Scheme | Available on designated land |
| Rear extension, attached house | 3m | 6m with Prior Approval | Standard limit only |
| Rear extension, detached house | 4m | 8m with Prior Approval | Standard limit only |
| Side extension | 50 percent of house width, single storey | Not applicable | No, removed in conservation areas |
| Two storey rear extension | 3m, min 7m from rear boundary | Not applicable | No, removed in conservation areas |
| Loft, terraced house | 40 cubic metres | Not applicable | Roof alterations restricted |
| Loft, detached or semi detached | 50 cubic metres | Not applicable | Roof alterations restricted |
The right hand column is the one that matters most in Fulham. The Larger Home Extension Scheme is excluded on designated land, so inside a conservation area the six and eight metre route simply isn’t available.
Loft Conversions Under Permitted Development
Loft volume can increase by up to 40 cubic metres on a terraced house or 50 on a detached or semi detached property. The roof slope fronting the highway must not be extended beyond its existing plane, and materials need to be similar in appearance to the existing house.
None of this applies to flats or maisonettes, which fall outside permitted development entirely. Worth establishing early if your Fulham property is a converted flat rather than a whole house.
Outbuildings and Porches
Outbuildings cover garden rooms, garages, home offices and studios. They must be single storey, and together with all other buildings must not cover more than 50 percent of the land around the original house.
Height limits apply. A dual pitched roof outbuilding can reach 4 metres, a flat roof structure 3 metres, and anything within 2 metres of a boundary is capped at 2.5 metres regardless of roof type. On designated land, an outbuilding sited more than 20 metres from the house is limited to 10 square metres.
Porches have a separate allowance, generally covering small front additions within 3 square metres of external floor area and 3 metres in height, kept at least 2 metres from any boundary with a highway.
Given how compact many Fulham gardens are, an outbuilding is often the most realistic way to add usable space, provided the street retains its rights.
Where Permitted Development Is Removed or Restricted
The categories are consistent nationally:
- Conservation areas, of which Hammersmith and Fulham has 45
- Listed buildings, regardless of grade
- National Parks, Areas of Outstanding Natural Beauty and World Heritage Sites
- Flats and maisonettes, which have no permitted development rights for extensions
- Any property covered by a relevant Article 4 Direction
- Basements anywhere in the borough, under the borough wide direction
How Fulham Architects Handle This in Practice
Local experience carries more weight here than in boroughs with lighter restrictions. A firm with genuine project history across SW6 will already know which streets carry directions and which conservation areas apply the tightest design scrutiny.
The cost argument is straightforward rather than rhetorical. A scheme designed on the assumption that permitted development applies, on a street where a direction has removed it, has to be redrawn against full planning criteria. That redesign is usually the largest avoidable cost on a Fulham project, and it’s avoided by a check that takes minutes.
An in house structural engineer matters more in this borough too. Victorian and Edwardian terraces frequently need structural reinforcement for loft conversions and rear extensions, and coordinating that inside one team avoids waiting on an outsourced engineer to sign off calculations.
RIBA chartered status and ARB registration are worth confirming directly rather than trusting a logo. Only individuals on the ARB register may use the title architect in the UK, and the register is public.
What This Means for Planning Your Project
Establish three things before commissioning drawings: whether the address sits in one of the 45 conservation areas, whether a specific Article 4 Direction applies to the street, and whether the property is a house rather than a flat. Get the answers in writing.
If the rights survive, the limits above give a reasonably quick route to extra space. If they don’t, plan for eleven to fourteen weeks from validation and design against the relevant conservation area appraisal from the outset. Either way, planning applications in this borough reward preparation, because the approval rate is high and the delays come from queries rather than refusals.