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Merton Council

Architectural technology in Merton

Planning drawings, building regulations, loft conversions, house extensions and mansards — delivered across Merton by MCIAT chartered technologists with deep knowledge of Merton Council's policies.

Merton at a glance

Planning authority
Merton Council
Population
215,000
Conservation areas
28
Article 4 Direction
No borough-wide
Postcodes
SW16, SW17, SW19, SW20, CR4
Typical housing
Victorian villas in Wimbledon

Chartered architectural technologist at work — architectural drawings in Merton

How often Merton says yes, and on which roads

Merton puts 2,258 of its 3,320 householder applications on the map, 68.0% of the borough, at an 88.2% approval rate on decided cases. Twenty-five of its 243 groups are listed without a pin, and Merton shows how blunt that test is: Hillcross Avenue, the busiest name at 43 applications, spreads 462 metres — barely past the 400-metre line, and quite possibly one long road rather than two sharing a name. South Park Road, at 26, is the busiest the map places without that doubt. Merton also loses more records to coordinates outside Greater London than any other borough mapped here: 89. Source: Greater London Authority Planning London Datahub, householder planning applications, retrieved 3 September 2026. Contains public sector information licensed under the Open Government Licence v3.0.

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What does Merton approve, and how quickly?

Merton approved 88.9% of the householder applications it decided in the three years to March 2026 and refused 278 of 2,494. It withdrew just 3.7% before decision and issued only 156 lawful development certificates — a strikingly low count that pushes more Merton work through a full application.

MeasureMertonLondon
Householder approval rate88.9%83.0%
Householder decisions made2,49477,680
Decided inside eight weeks91.4%
Lawful development certificates issued156
Applications withdrawn before decision3.7%7.4%
Rear dormer applications in the Datahub1,90085% approved
Householder appeals allowed after refusal36.5% of 21140.8% of 13,067

Sources: rows one to five and seven from MHCLG District Planning Application Statistics (PS1 and PS2), twelve quarters to March 2026, and Planning Inspectorate casework decided 2016–2026. Row six from the Planning London Datahub, retrieved 15 August 2026 — phrase-matched descriptions, comparable within Merton only. Open Government Licence v3.0.

Services available in Merton

Every architectural service in Merton — one chartered team.

Planning Drawings in Merton

Building Regulations Drawings in Merton

A construction-ready drawing package compliant with every Approved Document — Part A structure, Part B fire, Part L thermal, Part M accessib...

Loft Conversions in Merton

Every loft type across every Merton roof line — dormer, mansard, hip-to-gable, L-shape, Velux. LDC or full planning route, building regu...

House Extensions in Merton

The whole spectrum — rear extensions, side returns, wraparounds, double-storey, basement digs. Planning-led design with detailed technical p...

Mansard Roof Extensions in Merton

Merton's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that get approved in ...

Garage Conversions in Merton

Turn your unused Merton garage into a bedroom, home office or open-plan kitchen-diner. Planning route assessment, full building regulati...

Basement Conversions in Merton

Full architectural technology service for basement digs and cellar conversions in Merton — structural underpinning design, waterproofing...

Structural Calculations in Merton

Chartered structural engineer calculations for every residential intervention in Merton — steel beams, lintels, pad foundations, wall re...

Measured Building Surveys in Merton

Measured surveys across Merton — floor plans, elevations and sections to ±3mm accuracy. Leica Disto laser + BLK360 point-cloud scanning,...

Party Wall Services in Merton

End-to-end Party Wall Act 1996 service for Merton — Section 1, 3 and 6 notices, schedule of condition surveys, party wall award coordina...

Rear Dormer Loft Conversions in Merton

London's most popular loft type — the full-width rear dormer. Planning or Permitted Development route assessed for your Merton property,...

Merton planning context

Planning in Merton

Housing stock: Victorian villas in Wimbledon; Edwardian terraces in Tooting and Colliers Wood; 1930s semi-detached in Morden and Raynes Park; post-war flats in Mitcham.

Character: Wimbledon is heavily conservation-controlled; outer Merton (Morden, Mitcham) is permissive.

Notable conservation areas: Wimbledon Village, John Innes, Mitcham Cricket Green, Wimbledon Common

Architectural technology in Merton — a London terraced street of the type we survey
A london terraced street of the type we survey — architectural technology in Merton.
Nearby boroughs

Boroughs adjacent to Merton

Victorian villas in Wimbledon SW19
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All services in Merton

What we do in Merton

Planning Drawings in Merton

Building Regulations Drawings in Merton

A construction-ready drawing package compliant with every Approved Document — Part A structure, Part B fire, Part L thermal, Part M accessib...

Loft Conversions in Merton

Every loft type across every Merton roof line — dormer, mansard, hip-to-gable, L-shape, Velux. LDC or full planning route, building regu...

House Extensions in Merton

The whole spectrum — rear extensions, side returns, wraparounds, double-storey, basement digs. Planning-led design with detailed technical p...

Mansard Roof Extensions in Merton

Merton's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that get approved in ...

Garage Conversions in Merton

Turn your unused Merton garage into a bedroom, home office or open-plan kitchen-diner. Planning route assessment, full building regulati...

Basement Conversions in Merton

Full architectural technology service for basement digs and cellar conversions in Merton — structural underpinning design, waterproofing...

Structural Calculations in Merton

Chartered structural engineer calculations for every residential intervention in Merton — steel beams, lintels, pad foundations, wall re...

Measured Building Surveys in Merton

Measured surveys across Merton — floor plans, elevations and sections to ±3mm accuracy. Leica Disto laser + BLK360 point-cloud scanning,...

Party Wall Services in Merton

End-to-end Party Wall Act 1996 service for Merton — Section 1, 3 and 6 notices, schedule of condition surveys, party wall award coordina...

Rear Dormer Loft Conversions in Merton

London's most popular loft type — the full-width rear dormer. Planning or Permitted Development route assessed for your Merton property,...

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An architectural technologist checking a printed set of house drawings, marking a proposed elevation in red — architectural technology in Merton
Every set is checked line by line against the validation checklist before it leaves the office.

Which Merton postcodes does this drawing package service cover?

Every Merton postcode district we draw in, the stock that dominates it and the authority that validates a drawing package there. Merton fees below are the statutory England rates for 2026, not drawing package estimates.

PostcodeAreaDominant stockWhat it means for a drawing package
SW19Wimbledon / Colliers WoodVictorian villas, Edwardian terracesA drawing package in Wimbledon / Colliers Wood may land with Merton Council or Wandsworth Council — SW19 crosses the boundary, and the SW19 policies map decides it street by street.
SW20Raynes ParkVictorian villas, Edwardian terracesSW20 covers Raynes Park only; Merton Council handles the drawing package, and Raynes Park case officers apply the SW20 conservation-area map.
SM4Morden1930s semi-detached, post-war flatsSM4 covers Morden only; Merton Council handles the drawing package, and Morden case officers apply the SM4 conservation-area map.
CR4Mitcham1930s semi-detached, post-war estatesMitcham sits wholly inside CR4, so Merton Council validates every drawing package submitted from an CR4 address.
SW16Streatham / NorburyEdwardian terraces, post-war flatsSW16 straddles a boundary: Streatham / Norbury addresses fall to Lambeth Council or Wandsworth Council or Merton Council or Croydon Council, so confirm which authority validates the drawing package before submitting SW16 drawings.
SW17Tooting / EarlsfieldEdwardian terracesSW17 straddles a boundary: Tooting / Earlsfield addresses fall to Wandsworth Council or Merton Council, so confirm which authority validates the drawing package before submitting SW17 drawings.

How does a drawing package differ street by street across Merton?

Roof pitch, wall build-up and plot depth change every few Merton streets, and each one changes what a drawing package can achieve at that address.

What local planning policy applies to a drawing package in Merton?

Merton conservation designations: there are 28 across Merton Council, Wimbledon Common, Wimbledon Village, John Innes among them. Designation costs a Merton owner the permitted-development route: a drawing package then needs a £548 householder application over 8 weeks, in place of the £249 prior approval route that takes 6 weeks. Wimbledon Common is the Merton designation that most often changes a drawing package design.

Merton permitted development status: there is no borough-wide direction from Merton Council, so a drawing package at a SW19 address is normally still permitted development. We certify that with a £274 Lawful Development Certificate rather than leaving a Merton sale to argue it later.

Merton housing stock: Victorian villas in Wimbledon; Edwardian terraces in Tooting and Colliers Wood; 1930s semi-detached in Morden and Raynes Park; post-war flats in Mitcham. Wimbledon is heavily conservation-controlled; outer Merton (Morden, Mitcham) is permissive. Read that before choosing a drawing package route in Merton — construction, not postcode, sets what is achievable. Merton Council charges £548 for a householder application and has 8 weeks to determine it.

Which neighbouring authorities border Merton?

Sources for this Merton drawing package page: borough policies maps and conservation-area registers (2025–26), Royal Mail postcode district boundaries, the Town and Country Planning (Fees for Applications) (England) Regulations, the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and the Party Wall etc. Act 1996.

What are the chances of approval in Merton?

Over the 12 quarters from 2023 Q2 to 2026 Q1, Merton decided 2,494 householder planning applications and approved 88.9% of them — 5.9 percentage points above the London average of 83%. That places Merton 8th of 32 London boroughs on householder approval rate. These are decisions the council reported to MHCLG, not our own sample.

88.9%of householder applications approved
2,216approved in Merton
278refused over the same period
91.4%decided within 8 weeks
Merton planning decisions, 2023 Q2 to 2026 Q1
MeasureMertonContext
Householder applications decided2,49477,680 across London
Householder approval rate88.9%83% London average
Decided within 8 weeks91.4%19th fastest of 32 boroughs
Took longer than 13 weeks0.3%the applications that overran the statutory target
Minor dwellings approval rate62.3%new-build and conversion schemes under 10 units
All application types85.5%across 3,611 decisions
Certificates of lawfulness issued156confirmations that work was permitted development

Speed matters as much as the odds. Merton decided 91.4% of householder applications inside the eight-week statutory period and let 0.3% run past thirteen weeks. A drawing package that is complete and correctly described at validation is the part of that timeline you control; the rest belongs to the council's caseload.

Source: MHCLG District Planning Application Statistics (PS1 and PS2), 2023 Q2 to 2026 Q1, published quarterly by the Ministry of Housing, Communities and Local Government. Counts are decisions made in the window, not applications submitted. Contains public sector information licensed under the Open Government Licence v3.0.

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Neighbourhoods we cover in Merton

7 Merton neighbourhoods

We've delivered architectural drawings across every part of Merton. Each neighbourhood has its own conservation context and dominant housing stock — click through for area-specific guidance.

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