Authority
Merton planning context, framed for homeowners comparing scope, risk and application pathways.
Merton Planning Guide
What You Can Build in Merton
A homeowner-focused planning guide for lofts, extensions, basements, flats, conservation areas and practical planning strategy in Merton.
South West London50 In-Depth ArticlesExtensions, Lofts, BasementsConservation and Flats
Project Types
Rear and side extensions, lofts, mansards, basements, facade changes, flats, conservation areas and listed homes.
What It Covers
50 comprehensive articles detailing real Merton permissions, local design pressure, neighbour impact and buildability.
Use Case
A deep-dive council guide before engaging Hampstead Renovations for measured surveys, consultant packs or full application strategy.
50 Expert Guidance Articles
Merton Borough Planning Database
Suburban expansion, strict conservation in Wimbledon, heavy design pressure on green spaces and trees. Each card below is a full, dedicated article providing expert guidance on what matters before you commit to drawings, consultants or a submission package.
I
Core Rules
Permitted Development Rights in Merton
In the London Borough of Merton—stretching across Wimbledon, Raynes Park, Mitcham, and Morden—Permitted D... Read full guidance →
II
Core Rules
Full Planning Permission in Merton
When an architectural proposal breaches the mathematical limits of Permitted Development, or if your prop... Read full guidance →
III
Core Rules
Pre-Application Advice in Merton
Submitting a Full Planning Application to the London Borough of Merton for a highly ambitious project (su... Read full guidance →
IV
Core Rules
Validation Requirements in Merton
Before a planning officer in the London Borough of Merton even glances at the architectural merits of you... Read full guidance →
V
Core Rules
Design Policy Overview in Merton
Every decision rendered by a planning officer in the London Borough of Merton is anchored in the "Me... Read full guidance →
VI
Core Rules
Neighbour Amenity Tests in Merton
In the London Borough of Merton, your legal right to extend or develop your property is fundamentally ove... Read full guidance →
VII
Core Rules
Construction Management in Merton
Securing structural planning permission in the London Borough of Merton is only the first phase. The coun... Read full guidance →
VIII
Core Rules
Lawful Development Certificates (LDCs) in Merton
If your architectural plans for your Merton home allegedly align perfectly with Permitted Development (PD... Read full guidance →
IX
Core Rules
Retrospective Applications in Merton
Executing structural additions, facade changes, or outbuildings without prior consent from the London Bor... Read full guidance →
X
Core Rules
Appeals and Resubmissions in Merton
A refusal notice from the London Borough of Merton is not necessarily the death of an architectural proje... Read full guidance →
XI
Extensions
Rear Extensions in Merton
The single-story rear extension is the foundational architectural move for expanding family homes across... Read full guidance →
XII
Extensions
Side Return Extensions in Merton
The side-return extension—the classic architectural solution for widening the narrow rear kitchens (outsh... Read full guidance →
XIII
Extensions
Wrap-Around Extensions in Merton
A wrap-around extension aggressively combines the depth of a rear extension with the width of a side retu... Read full guidance →
XIV
Extensions
Single-Storey Family Additions in Merton
Executing a large single-story rear addition on a family home in the London Borough of Merton transcends... Read full guidance →
XV
Extensions
Two-Storey Extensions in Merton
The two-story extension is the apex of high-stakes, high-yield residential expansion in the London Boroug... Read full guidance →
XVI
Extensions
Infill and Courtyard Extensions in Merton
In densely packed terraced streets—such as those found in Colliers Wood or the grid streets of South Wimb... Read full guidance →
XVII
Extensions
Garden Room and Annex Rules in Merton
The post-pandemic explosion in home working has seen a massive surge in outbuildings across the large, le... Read full guidance →
XVIII
Extensions
Front Porches and Entrance Works in Merton
The front elevation is the public face of your property. Because any alteration here is highly visible fr... Read full guidance →
XIX
Extensions
Boundary Walls and Gates in Merton
Homeowners often assume that erecting a new fence or a brick wall around their property is a minor, unreg... Read full guidance →
XX
Extensions
Facade Changes in Merton
Modernizing the exterior skin of a house—whether by applying a sleek silicone render over tired pebbledas... Read full guidance →
XXI
Roof and Loft
Loft Conversions (PD) in Merton
Converting an empty, dusty roof void into a high-value master bedroom suite is the most lucrative archite... Read full guidance →
XXII
Roof and Loft
Rear Dormers in Merton
The standard rear box dormer is the engine of London loft conversions, designed to punch the roof outward... Read full guidance →
XXIII
Roof and Loft
Mansard Roofs in Merton
A true mansard roof—characterized by its steep, double-pitched slopes—is fundamentally distinct from a st... Read full guidance →
XXIV
Roof and Loft
Hip-to-Gable Conversions in Merton
For the thousands of 1930s semi-detached homes populating the suburban stretches of Merton—from Raynes Pa... Read full guidance →
XXV
Roof and Loft
Rooflights and Conservation in Merton
Installing rooflights (often referred to generically as Velux windows) is the least structurally invasive... Read full guidance →
XXVI
Roof and Loft
Roof Terraces and Balconies in Merton
Creating elevated outdoor space—whether cutting a terrace into a high roof pitch or placing a balcony on... Read full guidance →
XXVII
Roof and Loft
AC Units and Plant Equipment in Merton
As London summers grow hotter and home layouts shift toward heavy rear glazing, the integration of reside... Read full guidance →
XXVIII
Roof and Loft
Chimney Removal and Alteration in Merton
When executing ambitious internal reconfigurations or massive loft conversions, central chimney breasts r... Read full guidance →
XXIX
Roof and Loft
Parapet Walls in Merton
The parapet wall is a critical architectural device used to disguise flat roofs behind a raised masonry l... Read full guidance →
XXX
Roof and Loft
Mews House Roof Extensions in Merton
While rarer than the vast suburban tracts of Wimbledon, the London Borough of Merton contains pockets of... Read full guidance →
XXXI
Basements and Groundwork
Basement Policy in Merton
Constructing a subterranean level remains the ultimate high-value, high-risk architectural maneuver in th... Read full guidance →
XXXII
Basements and Groundwork
Basement Impact Assessments (BIA)
A Full Planning Application for a new basement in the London Borough of Merton will not even pass the ini... Read full guidance →
XXXIII
Basements and Groundwork
Light Wells and Grilles in Merton
A basement without natural daylight or ventilation is merely a subterranean vault, legally classified as... Read full guidance →
XXXIV
Basements and Groundwork
Under-Garden Excavation in Merton
When the footprint of the existing house cannot physically accommodate the desired subterranean square fo... Read full guidance →
XXXV
Basements and Groundwork
Sustainable Drainage Systems (SuDS) in Merton
The London Borough of Merton is intensely focused on mitigating urban flood risk. With changing climate p... Read full guidance →
XXXVI
Basements and Groundwork
Trees and Root Protection in Merton
The London Borough of Merton is intensely proud of its suburban, green canopy, particularly in wards like... Read full guidance →
XXXVII
Basements and Groundwork
Front Garden Parking in Merton
As parking pressures intensify across Merton—particularly around commuter hubs like South Wimbledon or Ra... Read full guidance →
XXXVIII
Basements and Groundwork
Dropped Kerbs and Highways in Merton
Securing planning permission to pave your front garden in the London Borough of Merton is entirely useles... Read full guidance →
XXXIX
Basements and Groundwork
Heat Pumps and Environmental Tech
Merton’s Local Plan is fundamentally aligned with London’s push toward net-zero carbon emissions. Consequ... Read full guidance →
XL
Basements and Groundwork
Outbuildings and Ground Coverage in Merton
The vast, deep gardens characteristic of Merton's affluent suburbs—such as Wimbledon Village and Coombe—i... Read full guidance →
XLI
Flats and Heritage
Flats and Maisonettes in Merton
A staggering percentage of planning enforcement cases in the London Borough of Merton stem from a single,... Read full guidance →
XLII
Flats and Heritage
Leasehold and LTA in Merton
Securing structural planning approval from Merton Council for an extension to your flat is entirely meani... Read full guidance →
XLIII
Flats and Heritage
Conservation Areas in Merton
The London Borough of Merton protects its most architecturally and historically significant neighborhoods... Read full guidance →
XLIV
Flats and Heritage
Listed Building Consent in Merton
Owning a Listed Building in the London Borough of Merton—whether a grand Grade II* villa in Wimbledon or... Read full guidance →
XLV
Flats and Heritage
Article 4 Directions in Merton
In certain highly sensitive wards within the London Borough of Merton, the standard national rules of Per... Read full guidance →
XLVI
Flats and Heritage
Heritage Statements in Merton
Navigating a planning application within a Merton Conservation Area or for a Listed Building is impossibl... Read full guidance →
XLVII
Flats and Heritage
Window and Door Replacements
Swapping out old, draughty windows for modern, highly insulated units is a primary goal for homeowners in... Read full guidance →
XLVIII
Flats and Heritage
Internal Works to Listed Buildings
The defining, suffocating reality of owning a Listed Building in the London Borough of Merton is that sta... Read full guidance →
XLIX
Flats and Heritage
Common Refusal Reasons in Merton
Planning applications in the London Borough of Merton do not fail by accident; they fail because architec... Read full guidance →
L
Flats and Heritage
Planning Strategy and Engagement
Approaching the London Borough of Merton’s planning department with an aggressive, maximalist architectur... Read full guidance →
Need Strategy Before Design?
Use the borough guide to frame the constraints first, then bring the live scheme into our in-house Planning & Permissions service for feasibility, drawings and submission strategy.
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Renovating in Merton
Planning is one part of a project. These pages explain what a house refurbishment, a flat refurbishment, a kitchen renovation or a bathroom renovation involves in each Merton area.