Full-plans building regulations drawings for Portsea — the technical construction set covering structure, fire safety, insulation and Part L, drawn to satisfy building control so your builder can price and build with certainty, delivered in days and revised free until sign-off, with a free project check first.
Portsmouth City Council granted 88% of the householder planning decisions it made in its latest published year — 1 point above the 87% England-wide householder average. Portsea's Georgian dockyard terraces are among the city's oldest domestic buildings and are protected accordingly, which is where a policy-literate drawing pack earns its keep. Its dominant Georgian (1714–1837), Victorian (1837–1901) and postwar (1945–1970) 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 Portsmouth City Council needs a full application. Portsea carries at least one Article 4 direction, and conservation areas including Portsea and HM Naval Base and St George's Square remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Portsea is determined against an 8-week statutory target.
St George's Square (surviving Georgian square of dockyard officers' houses), Queen Street (the historic commercial spine serving the naval base), The Hard (waterfront gateway to the dockyard and harbour station), White Hart Row (restored early terraces close to the yard walls), HM Naval Base (the historic dockyard and its listed storehouses) and Portsea Green (postwar estate blocks amid the older grain) — these are the Portsea pockets our drawings cover most. Heritage designations here include Portsea and HM Naval Base and St George's Square. Portsmouth City Council weighs each proposal against the Portsmouth Local Plan and the council's Houses in Multiple Occupation SPD, where the naval and maritime heritage of the base and its square sets a strict backdrop for any nearby alteration. Pockets of Portsea are converted flats and shared houses that sit outside householder permitted-development rights.. On roofs the borough is pitched slate roofs on the terraces and parapet roofs on the Georgian dockyard frontages, over dense Georgian and Victorian dockyard workers' terraces, naval and dockyard heritage buildings and postwar and modern infill housing.
Planning permission decides whether you can build; the Building Regulations decide that what you build is safe, warm and sound. They are two separate approvals, run by different bodies, and a Portsea project usually needs both. The building regulations set is the technical layer beneath the planning drawings — construction sections, structural details, insulation build-ups and fire-safety provisions that a builder works from and a building control surveyor checks against the approved documents.
In practice that means Part A structure — beam and foundation details with the structural calculations behind them; Part B fire — escape, protected routes and, in a loft, a fire door and mains-linked alarms; Part L conservation of fuel and power — U-values, insulation and airtightness; plus drainage, ventilation and stairs. On Portsea's stock, which runs to dense Georgian and Victorian dockyard workers' terraces, naval and dockyard heritage buildings and postwar and modern infill housing, the recurring challenge is meeting Part L in solid-walled period houses without ruining the room, and we detail the insulation to hit the numbers with the least intrusion.
Building control applies everywhere in Portsea regardless of planning designation, but in conservation areas such as Portsea and HM Naval Base and St George's Square the two processes interact — insulation and window details often have to satisfy Part L and a planning condition at once. The city-wide Article 4 direction removes permitted-development rights for small HMO conversions in Portsea, where dense workers' terraces beside the dockyard are exactly the stock the direction was written to protect. We draw the construction details to reconcile both.
A full-plans set for Portsea building control is checked against the Approved Documents. A typical extension or loft set covers each of these:
We produce the full-plans construction set — structure, fire, thermal and drainage details with the structural calculations — and submit it to your chosen building control body, whether that is Portsmouth City Council's own team or an approved inspector, so problems are settled on paper before they cost money on site.
Building control is a separate approval, but most Portsea projects clear planning first, so Portsmouth City Council's live decision record below sets the context. Portsmouth consents most householder schemes in Portsea, though the dockyard's Georgian heritage and the tight terraced grain drive the refusals. We handle both stages, so the construction drawings follow through seamlessly once permission is granted.
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.
There are two ways to get building control approval, and for anything structural in Portsea we recommend the full-plans route — particularly on the borough's dense georgian and victorian dockyard workers' terraces and naval and dockyard heritage buildings, where opening up an old structure tends to reveal surprises. A building notice lets work start with no approved drawings — cheaper up front, but the surveyor rules on compliance as the build proceeds, so a wrong detail is discovered mid-work and rebuilt at your cost. Full plans get the whole set checked and approved before a brick moves, which is what banks, warranty providers and future buyers want to see.
Full plans also protect the project commercially. With approved construction drawings your builder prices exact quantities rather than guessing, and there is a completion certificate at the end — the document a solicitor asks for when you sell across St George's Square, Queen Street and The Hard and the rest of Portsea. Where a project sits in a controlled setting — Portsea's Georgian dockyard terraces are among the city's oldest domestic buildings and are protected accordingly — the construction details also have to respect what planning has conditioned, and we draw the full set and manage the building control submission to reconcile both.
Every structural project needs building regulations drawings whatever the planning position. A few of the Portsea neighbourhoods and property types where we prepare them most often:
Building regulations drawings for St George's Square's surviving Georgian square of dockyard officers' houses — structure, fire and Part L detailed for building control sign-off.
Building regulations drawings for Queen Street's the historic commercial spine serving the naval base — structure, fire and Part L detailed for building control sign-off.
Building regulations drawings for The Hard's waterfront gateway to the dockyard and harbour station — structure, fire and Part L detailed for building control sign-off.
Building regulations drawings for White Hart Row's restored early terraces close to the yard walls — structure, fire and Part L detailed for building control sign-off.
Building regulations drawings for HM Naval Base's the historic dockyard and its listed storehouses — structure, fire and Part L detailed for building control sign-off.
Building regulations drawings for Portsea Green's postwar estate blocks amid the older grain — structure, fire and Part L detailed for building control sign-off.
They are different approvals and most projects need both. This is how they split in Portsea.
| Planning permission | Building regulations | |
|---|---|---|
| Question it answers | Should this be built here? | Is it built safely and efficiently? |
| Decided by | Portsmouth City Council planning | Building control body or approved inspector |
| Main drawings | Location, block, proposed plans & elevations | Structural, fire, thermal & construction details |
| Needed for permitted development? | No — a certificate is optional | Yes — always, before work starts |
In conservation areas such as Portsea and HM Naval Base and St George's Square, a planning condition can dictate materials that the building regulations details must then also satisfy.
A fixed process built around how Portsea projects are approved and inspected — most construction sets are ready within seven days of survey.
Send us your Portsea postcode and scheme. We confirm whether you also need planning, which parts of the regulations apply, and whether Portsmouth City Council building control or an approved inspector suits the job.
We measure the existing structure so the construction details, spans and junctions are drawn to the real building rather than an assumption — the base sound structural calculations depend on.
Chartered designers and engineers produce the full-plans set — structure, fire, Part L thermal, drainage and details — with the structural calculations that support every beam and foundation.
We submit the full-plans application to your building control body, resolve any queries before work starts, and revise the drawings free until the set is approved and the work signed off.
They are two separate approvals. Planning permission, decided by Portsmouth City Council, answers whether a scheme should be built at all — its size, look and impact on neighbours. Building regulations, checked by a building control body, answer whether it is built safely and efficiently — structure, fire, insulation and drainage. A Portsea project usually needs both, and even permitted-development work that skips planning still needs building control sign-off.
Yes — planning permission is not building control approval. The planning drawings show what the building looks like; building regulations drawings show how it is constructed, and no structural work in Portsea can lawfully complete without a building control sign-off. The two sets are drawn together but approved by different bodies, so having one never removes the need for the other. Portsmouth City Council is the decision-maker.
For anything structural in Portsea — a loft, an extension or removing a wall — we recommend full plans. The whole construction set is checked and approved before work starts, so a non-compliant detail is caught on paper rather than rebuilt on site. On the borough's dense georgian and victorian dockyard workers' terraces that certainty matters, and a building notice — which lets a surveyor judge compliance as work proceeds — risks costly rework. Banks and warranty providers also prefer the approved full-plans set that Portsmouth City Council or an approved inspector signs off.
Yes. You can use Portsmouth City Council's building control team or an independent approved inspector — both enforce the same regulations, so it comes down to price, availability and continuity. We draw the full-plans set to the same standard either way and submit it to whichever body you choose, then manage the queries and inspections through to the completion certificate. This applies to your Portsea address specifically.
Solid-walled period houses — common across Portsea, including conservation areas such as Portsea and HM Naval Base and St George's Square — are the hardest to bring up to Part L without losing room or altering the fabric. We detail the insulation to hit the required U-values with the least intrusion, using internal or roof-level build-ups and, where a planning condition protects the exterior, methods that satisfy both the energy standard and the heritage requirement at once. Portsmouth City Council is the decision-maker.
We price each Portsea job individually, because the structural content and the size of the construction set vary from a single beam to a whole-house refurbishment, and send a fixed, no-obligation quote within one working day. It covers the full-plans drawings and structural calculations with free revisions until sign-off. The building control body's own fee is separate. Call 020 7864 7245 to start. Portsmouth City Council is the decision-maker.
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.