London Planning Updates 2026: What Homeowners and Developers Need to Know
Updated: September 2026
Planning rules in England and London are changing. If you are considering a house extension, loft conversion, new home or residential development in London, understanding the latest planning policies at an early stage can help identify opportunities, avoid unnecessary redesign and establish the right planning strategy.
In this September 2026 update, ANDS Architecture looks at some of the most important changes affecting residential development in London, including the new National Planning Policy Framework, the Draft London Plan 2026 and proposals for small-site development.
A New National Planning Policy Framework Is Now in Force
A new National Planning Policy Framework (NPPF) was published on 17 August 2026 and now sets out national planning policy for England.
The 2026 NPPF replaces the previous December 2024 version and introduces a clearer separation between policies relating to plan-making and those used when deciding planning applications. The Government confirmed that the new decision-making policies took effect from 17 August 2026.
For homeowners and developers, this matters because planning applications must be considered against the relevant development plan while also taking account of national planning policy where appropriate.
The new framework includes policy changes relating to development around well-connected railway stations, development density and a broader range of development within the curtilage of residential properties.
However, these national policy changes should not be confused with permitted development rights. They do not create an automatic right to extend a house, construct an additional dwelling or redevelop a residential site.
Each proposal still needs to be assessed against its own planning circumstances.
What Could the Changes Mean for Residential Projects?
One of the notable themes in the new NPPF is a stronger emphasis on making effective use of land.
The Government states that the new framework supports increased densities and more types of development within the curtilage of residential properties, including additional floorspace rather than focusing only on additional residential units.
For London homeowners and landowners, this may be relevant to projects such as house extensions, additional accommodation, infill development and the redevelopment of underused residential land.
It does not, however, mean that every property can automatically accommodate more development.
The scale and form of development that may be acceptable will continue to depend on factors such as the property, surrounding buildings, local planning policies, neighbouring amenity, heritage considerations, design quality and other site constraints.
At ANDS Architecture, we believe these issues are best considered at the beginning of the design process rather than after a proposal has already been developed. Our architectural services are tailored to the property, the brief and the relevant planning context.
A New London Plan Is Being Prepared
London is also going through an important period of planning-policy change.
The Draft London Plan 2026 was published on 16 July 2026 and is currently undergoing consultation.
The consultation closes at 5pm on Thursday 15 October 2026. The next stage is expected to include an Examination in Public during 2027, with City Hall currently indicating anticipated adoption in early 2028.
An important distinction for anyone preparing a planning application today is that the Draft London Plan has not yet replaced the existing plan.
The London Plan 2021 remains the adopted planning framework for London while the replacement plan continues through the statutory process.
The draft can nevertheless be relevant to understanding the direction of future planning policy and should be considered carefully where appropriate. The Draft London Plan consultation information provides further detail about the process.
More Homes and More Efficient Use of London's Land
The Draft London Plan places considerable emphasis on increasing housing delivery while making effective use of London's limited land.
It currently plans for 558,000 new homes between 2027 and 2036, with longer-term ambitions relating to London's assessed housing need.
The draft also links future development closely with sustainable transport and seeks to optimise how suitable land is used.
For architects, homeowners and developers, this makes questions of site capacity increasingly important.
A small or constrained site should not necessarily be dismissed simply because it appears difficult at first glance. Careful architectural analysis may identify ways of accommodating appropriate development while responding sensitively to neighbouring properties and the surrounding character.
This could be particularly relevant to infill plots, corner sites, garage sites, backland locations and other underused pieces of residential land.
The London Plan’s draft policies on making best use of land and achieving Good Growth provide further context for this direction of travel.
Small Sites Are Becoming an Important Part of London's Planning Strategy
One of the most relevant current proposals for smaller residential developments is the Draft London Small Site Design Code.
The draft Code was published for consultation on 11 September 2026, with consultation running until 4 December 2026. It applies to small sites of less than 0.25 hectares and has been developed alongside the Draft London Plan.
Its purpose is to provide a clearer London-wide design framework for delivering homes on small sites.
Under draft London Plan Policy MBUL2, developments that comply with the Code are proposed to be considered acceptable in principle in design terms, although other planning considerations would still need to be addressed.
This could become particularly relevant to London projects involving infill development, backland plots, small vacant sites and redevelopment within established residential areas.
The Code is currently draft guidance, so it should not yet be presented as adopted planning policy.
Does This Mean It Will Be Easier to Build on Small Sites?
Not automatically.
Planning policy may increasingly support efficient use of suitable land, but every site has its own constraints.
A planning authority may still need to consider issues including scale, massing, neighbouring privacy, outlook, daylight and sunlight, access, refuse and cycle storage, trees, flood risk, heritage, transport and the character of the surrounding area.
Good architectural design is therefore particularly important on constrained sites.
Rather than simply asking “How much can we fit?”, a stronger starting point is often:
“What amount and form of development can this site accommodate well?”
That distinction can be important when developing a planning strategy.
Local Borough Planning Policies Still Matter
Although national and London-wide policies are changing, London boroughs continue to have their own Local Plans, design guidance and planning requirements.
A rear extension that may be acceptable in one borough will not necessarily receive the same response in another.
Even neighbouring streets can be affected by different constraints.
Conservation areas, listed buildings, Article 4 Directions, previous planning conditions, trees and the individual planning history of a property may all affect what is possible.
For this reason, online examples of planning approvals should be treated carefully. A successful project elsewhere does not automatically establish what will be acceptable on another property.
A site-specific planning assessment is much more useful.
What About Permitted Development?
Permitted development remains an important option for many homeowners, but it operates separately from broader national planning policy.
Certain house extensions, loft conversions, roof alterations and outbuildings may be possible under permitted development rights where all relevant statutory limitations and conditions are met.
Those rights can, however, be restricted in certain circumstances.
For example, different rules can apply to flats and maisonettes, designated areas and listed buildings, while an Article 4 Direction or condition attached to a previous planning permission may remove particular permitted development rights.
Being located in a conservation area does not automatically remove all permitted development rights, although some rights are more restricted in designated areas.
Where permitted development is being relied upon, homeowners may also wish to consider applying for a Lawful Development Certificate to establish formal evidence of the planning status of the proposed works.
Good Design Still Matters
The drive to deliver additional housing does not remove the importance of architectural quality.
The Draft London Plan continues to address the design and quality of residential development, while the proposed approach to small sites is intended to provide greater clarity around forms of development that can respond successfully to London's existing neighbourhoods.
Successful residential development therefore needs to balance planning opportunity with the quality of the spaces being created.
Natural light, privacy, outlook, ventilation, circulation, storage, energy performance and the relationship between a building and its surroundings all matter.
For homeowners, this is particularly important when extending an existing property. Creating more floor area is useful only if that additional space improves how the home works.
Planning an Extension or Development in London?
If you are considering a house extension, loft conversion, refurbishment, new home or residential development in London, it is worth understanding the planning position before committing to a final design.
At ANDS Architecture, we consider planning strategy alongside architectural design from the beginning of a project.
This may involve reviewing the property's planning history, relevant borough policies, permitted development opportunities, conservation or heritage constraints, the London Plan, site capacity, neighbouring properties and the most appropriate planning route.
By understanding these issues early, it is often possible to develop a clearer brief and design a proposal that responds more effectively to both the client's ambitions and the planning context.
You can explore ANDS Architecture’s projects or learn more about the practice through our architectural services.
Key Planning Dates for 2026
As of 28 September 2026, the new NPPF has been in force since 17 August 2026; the London Plan 2021 remains the adopted London Plan; consultation on the Draft London Plan 2026 closes at 5pm on 15 October 2026; and consultation on the Draft London Small Site Design Code closes on 4 December 2026.
Planning policy continues to evolve, so the current national, London-wide and borough-level position should always be checked for the individual property before a project proceeds.
Speak to ANDS Architecture
Considering an extension, new home or development opportunity in London?
ANDS Architecture can help you assess the potential of your property, develop the architectural design and establish an appropriate route through the planning process.
Explore our architectural services and projects, or contact ANDS Architecture to discuss your project.
This article provides general information only and should not be treated as planning or legal advice. Planning requirements depend on the individual property, proposal, planning history and local planning authority.
