Single-storey, double-storey, rear and side extension drawings for Barbican homes — measured to Plymouth City Council's design guidance, delivered in days and revised free until your decision, with a free approval-odds check before you commit.
Plymouth City Council granted 93% of the householder planning decisions it made in its latest published year — 6 points above the 87% England-wide householder average. The Barbican holds one of England's densest clusters of listed medieval and Tudor buildings, so alterations are judged street-by-street against original fabric, which is where a policy-literate drawing pack earns its keep. Its dominant Georgian (1714–1837) and Victorian (1837–1901) housing stock sets the design brief on most streets.
Class A and Class B set the thresholds — a rear dormer to 40m³ on a terrace or 50m³ on a semi or detached, and a single-storey rear extension to 3m on a terrace or 4m on a detached house — beyond which Plymouth City Council needs a full application. Barbican carries at least one Article 4 direction, and conservation areas including Barbican, Ebrington Street and The Hoe remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Barbican is determined against an 8-week statutory target.
New Street (Plymouth's oldest surviving street of Elizabethan timber-and-stone merchant houses), Sutton Harbour (the working fishing harbour ringed by converted warehouses and flats), The Parade (Georgian custom-house frontages at the head of the harbour), Ebrington Street (a surviving Georgian and Victorian shopping street east of the centre), Bretonside (the sloping ground linking the Barbican to the city centre) and Castle Street (narrow historic lanes below the site of Plymouth Castle) — these are the Barbican pockets our drawings cover most. Heritage designations here include Barbican, Ebrington Street and The Hoe. Plymouth City Council weighs each proposal against the Plymouth and South West Devon Joint Local Plan (2019), where Ebrington Street escaped the worst of the wartime bombing that flattened the neighbouring centre, and its surviving Georgian grain is protected as a rare pre-war survival. Much of the Barbican's upper-floor stock is already flats and maisonettes above harbourside commercial units, which carry no householder permitted-development rights.. On roofs the borough is steep pitched and gabled slate roofs on the Tudor and merchant houses and pitched roofs and parapets on the Georgian and warehouse ranges, over Elizabethan and Jacobean merchant houses around New Street, Georgian and Victorian terraces and warehouses and flats above the harbourside frontages.
Barbican homes come in a handful of recurring shapes, and each one points to a different extension. The borough is built largely from Elizabethan and Jacobean merchant houses around New Street, Georgian and Victorian terraces and warehouses and flats above the harbourside frontages, so a Victorian terrace usually wants a rear or side-return infill, while an interwar semi has room for a wider single-storey wrap or a two-storey side addition. Plymouth City Council judges every one of them against the Plymouth and South West Devon Joint Local Plan (2019), weighing footprint, height and the impact on the house next door before it looks at the elevations.
That is why the drawings decide the outcome. We set the extension depth against the permitted-development limits precisely, keep the eaves and ridge within the allowances, and plot the 45-degree daylight lines to the neighbours' windows so the case officer can see the amenity test is passed. The Barbican holds one of England's densest clusters of listed medieval and Tudor buildings, so alterations are judged street-by-street against original fabric, so we design around it from the first sketch rather than discover it at validation.
Barbican also protects whole streets — Barbican, Ebrington Street and The Hoe among them. The Barbican sits beside the city-centre streets covered by Plymouth's HMO Article 4 direction (in force 14 September 2012), which removed the right to convert a dwelling into a small house in multiple occupation without permission, and its own conservation-area status already pulls most external alterations into the planning system. On designated land the larger-home extension route and most side extensions stop being permitted development, so we confirm your address against those layers before drawing a line.
Plenty of Barbican extensions are permitted development and need no planning application — a single-storey rear extension within the depth and height limits is the common case. You will normally need to apply to Plymouth City Council if any of these apply:
We draw the footprint, the ridge and eaves heights and the neighbours' daylight on the page — the relationships Plymouth City Council's officers weigh first — and submit a validation-complete pack, whether that is a lawful development certificate, a prior-approval notification or a full householder application.
Below is Plymouth City Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Plymouth approves most householder schemes, yet on the Barbican the concentration of listed Tudor and Georgian buildings and the harbour setting mean heritage impact is the recurring reason a scheme is refused or reworked. A complete, policy-literate extension pack anticipates those pressure points before submission, which is why professionally drawn applications are decided faster and refused less often than DIY ones.
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 New Street, Sutton Harbour and The Parade, the extension that lands most often is the single-storey rear addition — a glazed kitchen-diner across the back of the house, kept within the permitted-development depth or taken to a full application where the ground floor wants more. On the borough's elizabethan and jacobean merchant houses around new street, a side-return infill frequently pairs with it to square off the plan; on wider flats above the harbourside frontages, a two-storey side or rear extension can add a bedroom above without swallowing the garden.
Ebrington Street escaped the worst of the wartime bombing that flattened the neighbouring centre, and its surviving Georgian grain is protected as a rare pre-war survival. We size the extension to the amenity and daylight tests, match the roof and materials to the host house, and keep enough garden to satisfy Plymouth City Council's space standards — so the scheme answers the borough's questions before an objection can raise them. Where permitted-development rights are used up or removed, we prepare the householder application to the council's extension design guidance instead.
We draw extensions on every street in the borough. A few of the neighbourhoods where Barbican projects come up most often:
Extension drawings for New Street's Plymouth's oldest surviving street of Elizabethan timber-and-stone merchant houses — footprint-checked, daylight-tested and drawn to Plymouth City Council's guidance.
Extension drawings for Sutton Harbour's the working fishing harbour ringed by converted warehouses and flats — footprint-checked, daylight-tested and drawn to Plymouth City Council's guidance.
Extension drawings for The Parade's Georgian custom-house frontages at the head of the harbour — footprint-checked, daylight-tested and drawn to Plymouth City Council's guidance.
Extension drawings for Ebrington Street's a surviving Georgian and Victorian shopping street east of the centre — footprint-checked, daylight-tested and drawn to Plymouth City Council's guidance.
Extension drawings for Bretonside's the sloping ground linking the Barbican to the city centre — footprint-checked, daylight-tested and drawn to Plymouth City Council's guidance.
Extension drawings for Castle Street's narrow historic lanes below the site of Plymouth Castle — footprint-checked, daylight-tested and drawn to Plymouth City Council's guidance.
The right extension in Barbican depends on your house type and how much garden you can give up. This is how the main options compare on planning route and what they add.
| Extension type | Permitted development? | What it adds | What Plymouth City Council checks |
|---|---|---|---|
| Single-storey rear | Often, within 3m/4m depth (6m/8m via prior approval) | Bigger kitchen-diner across the back | Depth, height, neighbour daylight (45°) |
| Side-return infill | Sometimes, if within width and height limits | Squares off an L-shaped ground floor | Width vs the original house, glazing to boundary |
| Two-storey rear/side | No — full application | Extra bedroom or bathroom above | Bulk, overlooking, 7m rear-boundary gap |
| Wraparound (rear + side) | No — full application | Whole-width open-plan ground floor | Combined footprint and garden retained |
Route depends on your street — conservation areas such as Barbican and Ebrington Street and Article 4 directions can remove permitted-development rights.
A fixed process built around how Plymouth City Council validates and decides householder extension applications — most drawings are submission-ready within seven days of survey.
Tell us your Barbican postcode and house type. We confirm your conservation and Article 4 status, how much permitted-development depth you have left, and score your odds against live Plymouth City Council decisions.
We measure the existing footprint, floor and eaves levels, boundary distances and the neighbours' window positions — the numbers the depth limits and daylight tests depend on.
Chartered designers develop the single-storey, two-storey or side extension to your brief, drawn inside the permitted-development limits or to Plymouth City Council's extension design guidance.
We submit the certificate, prior-approval notice or application, manage validation and case-officer queries, and revise the drawings free until Plymouth City Council issues its decision.
Not always. A single-storey rear extension up to 3 metres deep on a terrace or semi, or 4 metres on a detached house, and no higher than 4 metres, is usually permitted development. In Barbican you will need to apply to Plymouth City Council for two-storey extensions, side extensions wider than half the house, anything forward of the front wall, deeper rear extensions under the larger-home prior-approval route, and any extension in a conservation area such as Barbican and Ebrington Street.
Standard permitted development allows 3 metres on a terraced or semi-detached house and 4 metres on a detached one. The larger-home extension scheme can double that to 6 or 8 metres, but it needs a prior-approval notification to Plymouth City Council and a neighbour-consultation period, and it does not apply on designated land such as Barbican's conservation areas. We confirm which route your property qualifies for before drawing.
Two-storey and double-storey extensions almost always need a full householder application to Plymouth City Council, because they fall outside permitted development on most homes. The council looks closely at bulk, overlooking of neighbours and the 7-metre gap a two-storey rear extension must keep from the rear boundary. We design to those tests and show the daylight and privacy angles on the drawings. This applies to your Barbican address specifically.
A householder planning application in Barbican runs to a statutory eight-week target, a larger-home prior-approval notification to around six weeks including the neighbour-consultation period, and a lawful development certificate to eight weeks. Incomplete submissions stall at validation, so we submit a complete pack and manage officer queries to keep the decision on schedule. Plymouth City Council is the decision-maker.
Yes — planning permission and building regulations are separate consents, and almost every extension needs both. Planning governs whether you can build it; building control governs how it is built, covering structure, insulation, drainage and fire safety. We prepare the building-regulations drawings alongside the planning set so Plymouth City Council's building control or an approved inspector can sign the work off. This applies to your Barbican address specifically.
Every house and brief is different, so we price each Barbican extension individually and send a fixed, no-obligation quote back within one working day. It covers the full drawing pack with free revisions until Plymouth City Council approves, and we tell you upfront whether your extension qualifies as permitted development. Call 020 7864 7245 to get started.
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.