Front-porch drawings for Borough Green & Platt homes — checked against the Class D permitted-development limits, drawn to Tonbridge and Malling Borough Council's frontage guidance, delivered in days and revised free until your decision, with a free approval-odds check first.
Tonbridge and Malling Borough Council granted 97% of the householder planning decisions it made in its latest published year — 10 points above the 87% England-wide householder average. Borough Green & Platt contains the Platt conservation area (Platt designated 1975), so materials, fenestration and roof form are assessed against the appraisal, which is where a policy-literate drawing pack earns its keep. Its dominant Victorian (1837–1901) and postwar (1945–1970) housing stock sets the design brief on most streets.
Under Class B, a rear dormer stays permitted development up to 40m³ of added roof volume on a terrace or 50m³ on a semi-detached or detached house, while Class A allows a single-storey rear extension of 3m beyond the original rear wall on a terrace and 4m on a detached house before a full application is needed. In conservation areas such as Platt those rights are removed, so we confirm your exact address before a line is drawn. A validated householder application in Borough Green & Platt is determined against an 8-week statutory target.
Platt (conservation area designated in 1975), Borough Green (civil parish within Borough Green & Platt) and Platt (civil parish within Borough Green & Platt) — these are the Borough Green & Platt pockets our drawings cover most. Heritage designations here include Platt. Tonbridge and Malling Borough Council weighs each proposal against the adopted Tonbridge and Malling local plan and Tonbridge and Malling Borough Council's design guidance for householder work, where the 2,550 homes here are 26% 1955-1964, 15% pre-1900, 11% 1983-1992, which is what sets the realistic roof and rear-projection options. On roofs the borough is shallow gabled roofs typical of that period's building and steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building, over late-1950s and early-1960s houses (26% of 2,550 homes), Victorian and earlier houses (15%) and 1980s estate houses (11%).
Borough Green & Platt's designated heritage is specific, and it is the first thing we check against your address: Platt (conservation area designated in 1975). Inside those boundaries permitted development is curtailed and Tonbridge and Malling Borough Council assesses materials, window detail and roof form against the area's own appraisal, so a scheme that would be waved through two streets away can need a full application here.
Beyond the designated areas, Borough Green & Platt takes in Borough Green and Platt. No Article 4 direction is recorded for Tonbridge and Malling Borough Council, but Borough Green & Platt's 1 conservation area still limit permitted development on those streets.
On stock, Borough Green & Platt is late-1950s and early-1960s houses (26% of 2,550 homes), Victorian and earlier houses (15%) and 1980s estate houses (11%) — which is why shallow gabled roofs typical of that period's building and steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building govern what a loft or rear projection can realistically be. Tonbridge and Malling Borough Council decided 515 householder applications in the latest published year and granted 97%, with 49% issued inside the eight-week target. Those are the numbers our drawings are prepared against.
The full build-period split for Borough Green & Platt runs pre-1900 15% (380 homes), 1900-1918 4% (100 homes), 1919-1929 4% (90 homes), 1930-1939 4% (110 homes), 1945-1954 10% (250 homes), 1955-1964 26% (660 homes), 1965-1972 3% (70 homes), 1973-1982 1% (20 homes), 1983-1992 11% (280 homes), 1993-1999 4% (100 homes) and 2000-2008 5% (130 homes). That distribution is why pre-1900 detailing dominates the drawings here, and it is measured from council-tax records rather than assumed from the street name.
Tonbridge and Malling Borough Council also decides for Bourne, Hildenborough, Judd, Larkfield and Pilgrims with Ightham, so a decision in Borough Green & Platt sits inside a wider pattern of decisions we track across the same authority — useful when an officer cites a precedent from the next area over.
Published figures for Borough Green & Platt and Tonbridge and Malling Borough Council. These are the numbers that decide what is realistic on your street, so we work from them rather than from national averages.
| Measure | Borough Green & Platt |
|---|---|
| Dwellings recorded | 2,550 |
| Built pre-1900 | 380 (15%) |
| Built 1900-1918 | 100 (4%) |
| Built 1919-1929 | 90 (4%) |
| Built 1930-1939 | 110 (4%) |
| Built 1945-1954 | 250 (10%) |
| Built 1955-1964 | 660 (26%) |
| Built 1965-1972 | 70 (3%) |
| Built 1973-1982 | 20 (1%) |
| Built 1983-1992 | 280 (11%) |
| Built 1993-1999 | 100 (4%) |
| Built 2000-2008 | 130 (5%) |
| Built before 1919 | 19% |
| Built 1919–1939 | 8% |
| Built 1945–2008 | 59% |
| Conservation areas in Borough Green & Platt | 1 (Platt) |
| Conservation areas district-wide | 60 |
| Article 4 directions recorded | 0 |
| Householder applications decided | 515 |
| Householder applications granted | 97% |
| Decided within 8 weeks | 49% |
Dwelling stock from VOA council-tax data at 31 March 2025; conservation-area and Article 4 counts from planning.data.gov.uk (MHCLG); decision figures are Tonbridge and Malling Borough Council's own, from MHCLG live table PS2 for the year to 31 March 2026.
A porch is the smallest thing most people build and the most visible. It sits on the principal elevation, so Tonbridge and Malling Borough Council reads it against the rhythm of the whole street rather than against your own house alone. Borough Green & Platt is largely late-1950s and early-1960s houses (26% of 2,550 homes), Victorian and earlier houses (15%) and 1980s estate houses (11%), and where a run of houses shares one front-door detail, a porch that ignores it stands out from fifty metres away.
The three Class D numbers do most of the work: 3 square metres of external floor area, 3 metres of height, and a 2-metre stand-off from any boundary that fronts a highway. That last one catches more porches in Borough Green & Platt than the other two put together, because front gardens are shallow and the boundary is measured to the highway line, not to the kerb. We measure it on site and set the porch inside the limit, or we tell you honestly that it needs an application.
In Borough Green & Platt's conservation areas — Platt among them — a porch is assessed on materials, roof form and how the door surround is treated. No Article 4 direction is recorded for Tonbridge and Malling Borough Council, but Borough Green & Platt's 1 conservation area still limit permitted development on those streets.
Most modest porches are permitted development. You will need to apply to Tonbridge and Malling Borough Council if any of these apply:
We draw the porch to scale against the three Class D thresholds, show the highway boundary on the block plan, and detail the roof, door surround and threshold so Tonbridge and Malling Borough Council — and your neighbours — can see exactly what will be built.
Below is Tonbridge and Malling Borough Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Tonbridge and Malling Borough Council granted 97% of its householder applications in the year to 31 March 2026, and Platt shapes what is approved here. A porch application turns on frontage design and the highway stand-off, so a pack that dimensions both is decided faster than a sketch.
Source: MHCLG planning application statistics (householder decisions, England, 1 April 2025 - 31 March 2026). Compare every borough on our London approval-rate league table.
Tell us about your project and get a fixed, no-obligation quote back within one working day. If you don't need planning permission at all, we'll tell you that too — for free.
Across Platt, Borough Green and Platt, the porches that go through are the ones that borrow from the house: the same brick or render, a roof pitched to match, and a door and side-light proportioned to the original opening. On late-1950s and early-1960s houses (26% of 2,550 homes), an open-sided canopy is often the better answer than an enclosed porch — it stays clear of the floor-area limit and leaves the frontage legible.
Borough Green & Platt contains the Platt conservation area (Platt designated 1975), so materials, fenestration and roof form are assessed against the appraisal, which is exactly the sort of local reading a porch has to satisfy. Where the 2-metre highway stand-off cannot be met, we either recess the porch behind the building line or prepare a full householder application with an elevation that shows the porch in the context of its neighbours — the drawing that answers the officer's real question.
We draw porches on every street type in Borough Green & Platt. A few of the areas where porch work comes up most often:
Porch drawings for Platt — conservation area designated in 1975 — dimensioned to the Class D limits and drawn to Tonbridge and Malling Borough Council's frontage guidance.
Porch drawings for Borough Green — civil parish within Borough Green & Platt — dimensioned to the Class D limits and drawn to Tonbridge and Malling Borough Council's frontage guidance.
Porch drawings for Platt — civil parish within Borough Green & Platt — dimensioned to the Class D limits and drawn to Tonbridge and Malling Borough Council's frontage guidance.
Class D sets three thresholds. This is how the common cases fall either side of them.
| Porch type | Permitted development? | What decides it | What Tonbridge and Malling Borough Council checks |
|---|---|---|---|
| Open canopy over the door | Usually yes — no enclosed floor area | Whether it is enclosed | Projection, materials, roof form |
| Enclosed porch under 3m² | Yes, if under 3m high and 2m from the highway boundary | External floor area | Highway stand-off, frontage design |
| Enclosed porch over 3m² | No — full application | External floor area | Bulk on the principal elevation |
| Porch in a conservation area | Only if it meets Class D and no Article 4 applies | Designation status | Materials, door detail, streetscape |
| Porch on a listed building | No — listed building consent required | Listing | Impact on special interest |
Thresholds from the Town and Country Planning (General Permitted Development) (England) Order 2015, Schedule 2, Part 1, Class D.
A fixed process built around how Tonbridge and Malling Borough Council validates and decides frontage work — most porch drawings are submission-ready within seven days of survey.
Send us your Borough Green & Platt postcode. We confirm conservation, Article 4 and listing status, measure the front boundary against the 2-metre highway rule, and score your odds against live Tonbridge and Malling Borough Council decisions.
We measure the frontage, threshold level, door opening and the distance to the highway boundary — the four numbers a porch application stands or falls on.
Chartered designers develop the porch to your brief, either inside the Class D limits or as a full application drawn to Tonbridge and Malling Borough Council's design guidance, with materials and roof form matched to the house.
We submit the certificate or application, manage validation and case-officer queries, and revise the drawings free until Tonbridge and Malling Borough Council issues its decision.
Usually not, provided it meets all three Class D limits: no more than 3 square metres of external floor area, no more than 3 metres high, and no part within 2 metres of a boundary fronting a highway. Break any one and you need a householder application to Tonbridge and Malling Borough Council. On designated land, and on listed buildings, the position is different and we check it before drawing. This applies to your Borough Green & Platt address specifically.
It is the external floor area — measured to the outside face of the porch walls, not the usable space inside. That catches people out, because a porch that feels small internally can exceed 3 square metres once the wall thickness is counted. We measure and dimension it on the plan so the figure is beyond argument at validation. This applies to your Borough Green & Platt address specifically. Tonbridge and Malling Borough Council is the decision-maker.
No part of a permitted-development porch may be within 2 metres of any boundary of the property that fronts a highway. In Borough Green & Platt this is the limit that most often pushes a porch into a full application, because front gardens are shallow. The measurement is to the boundary line, which is not always where the kerb or the fence sits — we establish it on survey. Tonbridge and Malling Borough Council is the decision-maker.
Yes, but the design bar is higher. Class D is not automatically removed in a conservation area, so a compliant porch can still be permitted development — however Tonbridge and Malling Borough Council will expect materials, roof pitch and door detail to respect the area's character, and an Article 4 direction can remove the right entirely. In Platt we confirm the position on your specific address first. This applies to your Borough Green & Platt address specifically.
A porch is exempt from most building regulations if it is under 30 square metres, at ground level, separated from the house by the existing external door, and any glazing and electrics meet Parts K, N and P. Remove the original front door and the porch becomes part of the heated envelope, at which point insulation and Part L apply. We flag which side of that line your design falls on. This applies to your Borough Green & Platt address specifically. Tonbridge and Malling Borough Council is the decision-maker.
A householder application runs to an eight-week statutory target, and a lawful development certificate to the same. The realistic risk is not the decision but validation — an incomplete pack is returned rather than determined. We prepare the submission validation-complete and handle officer queries so the timetable holds. This applies to your Borough Green & Platt address specifically. Tonbridge and Malling Borough Council is the decision-maker.
We quote each Borough Green & Platt porch individually, because frontage type and boundary position vary house to house, and send a fixed, no-obligation quote within one working day. It covers the full drawing pack with free revisions until Tonbridge and Malling Borough Council approves. Call 020 7864 7245 to start.
Answer five quick questions and get a free planning score for your exact address — instantly. Then, if you want the full picture, unlock the detailed analysis: your council's live approval rates, local precedents, constraints on your street and a step-by-step route to permission.
Same fixed quotes, same fast drawings — wherever your project is.