Engineer's calculations for a Greenwich project — steel beams sized, padstones and load paths worked out and a signed calculations package your builder and the Royal Borough of Greenwich's building control can build from, delivered in days and revised free until it is approved.
the Royal Borough of Greenwich granted 87% of the householder planning decisions it made in its latest published year — level with the 87% England-wide householder average. The Maritime Greenwich World Heritage Site and its buffer zone add height and setting tests near the town centre, which is where a policy-literate drawing pack earns its keep. Its dominant Georgian (1714–1837), Victorian (1837–1901), Edwardian (1901–1910) and interwar (1918–1939) 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 the Royal Borough of Greenwich needs a full application. Greenwich carries at least one Article 4 direction, and conservation areas including West Greenwich, Blackheath Park and Ashburnham Triangle remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Greenwich is determined against an 8-week statutory target.
Greenwich (Georgian and early-Victorian terraces inside the West Greenwich conservation area), Blackheath (villas and terraces around the Cator Estate and Blackheath Park), Westcombe Park (Edwardian and Victorian villas climbing the hill above the river), Charlton (the older cottages and interwar streets around Charlton Village), Eltham (interwar semis including the Well Hall Progress Estate) and Woolwich (denser Victorian terraces amid riverside regeneration) — these are the Greenwich pockets our drawings cover most. Heritage designations here include West Greenwich, Blackheath Park, Ashburnham Triangle, Westcombe Park and Charlton Village. the Royal Borough of Greenwich weighs each proposal against the Royal Greenwich Local Plan: Core Strategy with Detailed Policies and the borough's residential extensions design guidance, where protected Thames-side views shape what roof additions are acceptable on the borough's northern edge. On roofs the borough is parapet and butterfly roofs on the Georgian terraces and pitched and hipped roofs on the villas, over Georgian and early-Victorian terraces, Victorian and Edwardian villas and riverside and interwar housing.
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 Greenwich's Georgian and early-Victorian terraces, Victorian and Edwardian villas and riverside and interwar housing, 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 Maritime Greenwich World Heritage Site and its buffer zone add height and setting tests near the town centre, 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 Greenwich stock — the kind found across West Greenwich, Blackheath Park, Ashburnham Triangle, Westcombe Park and Charlton Village — 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. Article 4 directions strip out permitted-development rights across Greenwich's conservation areas such as West Greenwich and Westcombe Park, so front-facing and roof alterations there need a full application. 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 Greenwich 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 the Royal Borough of Greenwich'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 the Royal Borough of Greenwich's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Greenwich approves most householder applications, but the Maritime Greenwich World Heritage Site and its dense conservation coverage set the terms for what works near the town centre and the river. 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. the Royal Borough of Greenwich'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 Greenwich, Blackheath and Westcombe Park, the recurring issue is a beam sized off a rule of thumb that the actual span will not support.
Protected Thames-side views shape what roof additions are acceptable on the borough's northern edge. 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 Greenwich 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 Greenwich neighbourhoods where structural packages come up most often:
Structural calculations for Greenwich's Georgian and early-Victorian terraces inside the West Greenwich conservation area — beams sized, load paths traced and signed for the Royal Borough of Greenwich's building control.
Structural calculations for Blackheath's villas and terraces around the Cator Estate and Blackheath Park — beams sized, load paths traced and signed for the Royal Borough of Greenwich's building control.
Structural calculations for Westcombe Park's Edwardian and Victorian villas climbing the hill above the river — beams sized, load paths traced and signed for the Royal Borough of Greenwich's building control.
Structural calculations for Charlton's the older cottages and interwar streets around Charlton Village — beams sized, load paths traced and signed for the Royal Borough of Greenwich's building control.
Structural calculations for Eltham's interwar semis including the Well Hall Progress Estate — beams sized, load paths traced and signed for the Royal Borough of Greenwich's building control.
Structural calculations for Woolwich's denser Victorian terraces amid riverside regeneration — beams sized, load paths traced and signed for the Royal Borough of Greenwich's building control.
Different jobs load the building differently, so each needs its own calculation. This is what the common Greenwich 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 Greenwich stock around West Greenwich and Blackheath Park, 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 Greenwich 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 Greenwich architectural set.
We submit the calculations to the Royal Borough of Greenwich'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. the Royal Borough of Greenwich's building control needs an engineer's calculation to approve any of these before the steel goes in. A Greenwich 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 the Royal Borough of Greenwich will allow the change; structural calculations prove the change is safe to build and are submitted to building control, not to the planners. Many Greenwich 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. the Royal Borough of Greenwich'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 Greenwich builder can order and the Royal Borough of Greenwich'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 Greenwich's older stock often hides surprises — a wall that turns out to be load-bearing, notched or altered joists, or shallow foundations near West Greenwich and Blackheath Park. 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. the Royal Borough of Greenwich is the decision-maker.
We price each Greenwich 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 the Royal Borough of Greenwich's building control approves. Call 020 7864 7245 to start.
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