Engineer's calculations for a Camden project — steel beams sized, padstones and load paths worked out and a signed calculations package your builder and Camden Council's building control can build from, delivered in days and revised free until it is approved.
Camden Council granted 88% of the householder planning decisions it made in its latest published year — 1 point above the 87% England-wide householder average. The council runs one of London's strictest basement regimes, capping depth and demanding a Basement Impact Assessment, 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 Camden Council needs a full application. Camden carries at least one Article 4 direction, and conservation areas including Hampstead, Fitzroy Square and Bloomsbury remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Camden is determined against an 8-week statutory target.
Hampstead (Georgian and Victorian houses inside a tightly protected conservation area), Belsize Park (grand Victorian villas and red-brick mansion blocks), Camden Town (dense Victorian terraces around the market), Primrose Hill (pastel-painted Victorian terraces beside Regent's Park), Kentish Town (Victorian terraces and converted flats) and Bloomsbury (Georgian squares and formal terraces) — these are the Camden pockets our drawings cover most. Heritage designations here include Hampstead, Fitzroy Square, Bloomsbury, Camden Town and Primrose Hill. Camden Council weighs each proposal against Camden Local Plan and the Camden Planning Guidance (CPG) on home improvements, where mansard and roof additions in conservation areas are measured against the terrace's original roofline and rhythm. Purpose-built mansion flats and converted terraces are widespread, and flats and maisonettes carry no householder permitted-development rights.. On roofs the borough is London butterfly / valley roofs behind parapets and mansard roofs on the taller terraces, over Georgian and Victorian terraces, purpose-built mansion flats and converted period flats.
The moment a wall comes out or a new floor goes in, something has to carry the load that wall or floor was holding — and building control will not accept "it looks strong enough". The engineer traces the load path: the weight of the roof, floors and walls above is gathered into a beam, the beam is sized in steel or timber to carry it within safe deflection, and that load is passed through padstones into the masonry and down to the ground. On Camden's Georgian and Victorian terraces, purpose-built mansion flats and converted period flats, the spans and loads differ house to house, so every calculation is specific to the property.
The deliverable is two things that work together: the calculations, which show the maths an approved inspector can check, and the structural drawings, which turn that maths into something a builder can order and fit — a beam schedule with sizes and lengths, bearing and padstone details, and connection notes. The council runs one of London's strictest basement regimes, capping depth and demanding a Basement Impact Assessment, and the calculations are drawn to sit alongside the architectural set rather than contradict it. Everything is signed by a chartered or incorporated engineer carrying professional indemnity insurance.
Older Camden stock — the kind found across Hampstead, Fitzroy Square, Bloomsbury, Camden Town and Primrose Hill — often hides the real structural question: shallow Victorian foundations, timber that has been notched by past work, or a wall that turns out to be load-bearing when the drawings assumed otherwise. Much of Camden — the Hampstead and Fitzroy Square conservation areas among them — sits under Article 4 directions that strip out permitted-development rights, and the borough's basement rules pile on a further layer of control. A survey-based calculation catches this before the wall is opened, not after.
Building control needs an engineer's calculations whenever you change how the building carries load. On a typical Camden project that means any of these:
We size the steel, work the padstones and bearings, trace the load to the foundations and issue a signed calculations package and a beam schedule for Camden Council's building control — coordinated with your architectural drawings so the beam that is calculated is the beam that is drawn and the beam that is ordered.
Below is Camden Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Camden approves the large majority of householder applications, though its basement policy and dense conservation coverage are the decisive constraints on many schemes. Structural calculations sit behind building control rather than planning, but the same wave of loft, extension and knock-through work that drives these decisions is exactly what needs an engineer's package.
Source: MHCLG planning application statistics (householder decisions, rolling year). 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.
Building control approves structural work by checking the numbers, not by looking at the finished steel. Camden Council's inspector, or an approved inspector acting for you, reads the calculations to confirm the beam is deep enough for its span, that deflection stays within limits so ceilings do not crack, that the bearing length and padstones spread the point load into masonry that can take it, and that the load has somewhere to go all the way to the ground. Across Hampstead, Belsize Park and Camden Town, the recurring issue is a beam sized off a rule of thumb that the actual span will not support.
Mansard and roof additions in conservation areas are measured against the terrace's original roofline and rhythm. We issue calculations detailed enough to be signed off without a query, coordinate them with the architect's drawings so nothing conflicts on site, and stay available to revise if the builder finds the Camden property is not quite as the survey assumed — free, until the work is approved.
We calculate beams, openings and floors on the period and modern stock across the borough. A few of the Camden neighbourhoods where structural packages come up most often:
Structural calculations for Hampstead's Georgian and Victorian houses inside a tightly protected conservation area — beams sized, load paths traced and signed for Camden Council's building control.
Structural calculations for Belsize Park's grand Victorian villas and red-brick mansion blocks — beams sized, load paths traced and signed for Camden Council's building control.
Structural calculations for Camden Town's dense Victorian terraces around the market — beams sized, load paths traced and signed for Camden Council's building control.
Structural calculations for Primrose Hill's pastel-painted Victorian terraces beside Regent's Park — beams sized, load paths traced and signed for Camden Council's building control.
Structural calculations for Kentish Town's Victorian terraces and converted flats — beams sized, load paths traced and signed for Camden Council's building control.
Structural calculations for Bloomsbury's Georgian squares and formal terraces — beams sized, load paths traced and signed for Camden Council's building control.
Different jobs load the building differently, so each needs its own calculation. This is what the common Camden projects typically require.
| Project | Typical structure | What the calculation proves | Signed off by |
|---|---|---|---|
| Wall knock-through | Steel beam on padstones | Span, deflection and bearing | Building control |
| Loft conversion | New floor beams and ridge/purlin steels | Floor loading and roof support | Building control |
| Rear or side extension | Opening beam plus extension roof and floor | Combined loads and foundations | Building control |
| Basement or underpinning | Retaining and foundation design | Ground and adjacent-building loads | Building control & party wall |
On older Camden stock around Hampstead and Fitzroy Square, shallow foundations and altered structure often mean the calculation drives the design rather than following it.
A fixed process built around building control rather than planning — most calculation packages are ready within five days of the architectural drawings.
Send us your Camden postcode and the architect's drawings or a sketch. We confirm what structure the project needs, flag any load-bearing wall or foundation question, and tell you exactly what the calculation package will cover.
Where the loads are not obvious — an unknown wall, an old alteration, a deep span — we survey the property so the beam is sized on what is really there, not an assumption.
A chartered or incorporated engineer sizes the steel, works the padstones and load path, and issues the signed calculations and a beam schedule coordinated with your Camden architectural set.
We submit the calculations to Camden Council's building control or your approved inspector, answer queries, and revise free if the build uncovers something the survey could not see.
Whenever you change how the building carries weight — removing or opening a load-bearing wall, converting a loft, building an extension, or inserting a beam or column. Camden Council's building control needs an engineer's calculation to approve any of these before the steel goes in. A Camden project that only redecorates or moves a non-structural partition does not, but almost anything that opens the structure does.
No — they are a separate, later step. Planning permission decides whether Camden Council will allow the change; structural calculations prove the change is safe to build and are submitted to building control, not to the planners. Many Camden projects that need no planning permission at all — an internal knock-through, a permitted-development loft — still need a full engineer's calculation before work can lawfully start.
A chartered or incorporated structural engineer, carrying professional indemnity insurance, who takes responsibility for the numbers. Camden Council's building control, or an approved inspector acting on your behalf, then checks and signs them off. Your builder cannot self-certify a steel beam, and an unsigned calculation will not be accepted — the engineer's signature and insurance are what make the package one building control will approve.
Yes — a beam over a removed wall is the most common calculation we do. We work out the load the wall was carrying, size a steel or timber beam to span the opening within safe deflection, and detail the padstones that spread its weight into the masonry each side. The result is a beam schedule your Camden builder can order and Camden Council's inspector can approve, with the load traced all the way to the foundations.
Sometimes. Where the loads are clear from the drawings we can calculate directly, but Camden's older stock often hides surprises — a wall that turns out to be load-bearing, notched or altered joists, or shallow foundations near Hampstead and Fitzroy Square. In those cases a short structural survey means the beam is sized on what is really there, which avoids a redesign once the builder opens the wall. Camden Council is the decision-maker.
We price each Camden package on the number of beams and the complexity — a single knock-through is straightforward, a whole-house loft-and-extension scheme has several elements — and send a fixed, no-obligation quote within one working day. It covers the calculations, the beam schedule and free revisions until Camden Council's building control 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.