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London rear extension built from approved building regulation drawings
Building Regulation Drawings · London & Home Counties

Building regulation drawings builders can price and building control approves

Detailed building regs drawings covering structure, fire safety, insulation and drainage — produced by chartered professionals in 7 days and revised free until building control signs them off. Planning permission is only half the job; this is the half your builder actually builds from.

★★★★★ Rated 4.9/5 by London homeowners96% approval rate · 2,400+ drawings delivered
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What drawings do I need for building regulations?

For building regulations approval you need detailed construction drawings showing how your project complies with the approved documents — structure, fire safety, insulation, ventilation and drainage — not just what it looks like. A full plans submission for a typical London extension or loft conversion includes:

  • Construction plans and sections at 1:50 or 1:20 showing wall, floor and roof build-ups with materials specified
  • Structural information — beam and steel positions with structural calculations for any load-bearing alterations (Part A)
  • Fire safety details: escape routes, fire doors, interlinked alarms and, for loft conversions, protected stairways (Part B)
  • Thermal specification with U-values for walls, floors, roofs and glazing to meet Part L energy standards
  • Ventilation provision — background, extract and purge ventilation to each room under Part F
  • Drainage layout showing foul and surface water runs, manholes and any build-over agreements (Part H)
  • Compliance notes covering the remaining approved documents that apply, from damp-proofing (Part C) to electrical safety (Part P)

The drawings that stand between planning approval and a finished build

Planning drawings show your council what the building will look like. Building regulation drawings show your builder — and building control — how it will actually stand up, keep warm, resist fire and drain. They are two different documents with two different audiences, and the second set is where most self-managed projects go wrong: vague drawings mean builders quote high to cover the unknowns, inspectors halt work over missing details, and disputes over 'what was included' surface halfway through the build.

Our building regs drawings for London projects are drawn to construction level of detail: every lintel, every damp-proof course, every insulation thickness and U-value, every fire door and every drainage fall specified against the relevant approved document, Parts A through P. We coordinate the structural calculations for beams, steels and load-bearing removals so the structural design and the construction drawings agree — no on-site surprises, no inspector queries your builder cannot answer.

The result is a pack you can put in front of three builders and get three genuinely comparable quotes, then hand to your approved inspector or local authority building control knowing it will pass plan check. If building control raises anything, we amend the drawings free until they are approved. We produce building regs drawings for London and Home Counties projects every working day, and a fixed, no-obligation quote reaches you within one working day of your enquiry.

Isometric construction diagram of a London rear extension used in building regulation drawings

Building control drawings for every London project

The same chartered team details every project type, coordinating structure, thermal and fire strategy in one consistent pack.

Extension building regs packs

Single and double-storey extensions detailed for foundations, steels, thermal bridging and drainage — the natural next step once your planning drawings are approved.

Loft conversion regs drawings

Floor strengthening, dormer construction, protected escape stairs and fire separation — loft conversions are the most regulation-heavy home project, and we detail them daily.

Internal alterations

Load-bearing wall removals, open-plan layouts and new kitchens or bathrooms, with beam calculations and fire strategy where open plans affect escape routes.

Flat conversions & HMOs

Sound separation, independent services, protected escape routes and fire compartmentation — detailed to satisfy both building control and licensing officers.

New build construction packs

Full construction drawings for new dwellings, coordinated with structural and energy calculations from foundation to ridge.

Regularisation drawings

As-built drawings and compliance details for work completed without approval, supporting a regularisation certificate from your local authority.

Ready for drawings your council will approve?

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.

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From planning approval to on-site start in four steps

Most building regulation drawing packs are ready within seven days — often before your builder has finished pricing — and the same team stays with you until building control gives its approval.

  1. 1

    Scope & survey

    We review your approved planning drawings (ours or another designer's) and confirm the construction details, structural scope and approved documents your project engages.

  2. 2

    Construction drawings

    Chartered technicians produce plans, sections and details specifying structure, insulation, fire safety, ventilation and drainage to current regulations.

  3. 3

    Structural coordination

    We coordinate calculations for beams, steels, padstones and foundations, so the structural design is embedded in the drawings rather than bolted on later.

  4. 4

    Submission & approval

    We submit your full plans application to local authority building control or your chosen approved inspector, answer plan-check queries and revise free until approval.

Frequently asked questions

How much do building regulation drawings cost in London?

It depends on your project's size and structural complexity, so we price each pack individually and guarantee a fixed, no-obligation quote within one working day — including coordination of structural calculations, with free revisions until building control approves. Send your planning drawings or project details for an exact figure.

What is the difference between planning drawings and building regulation drawings?

Planning drawings show the external appearance, size and siting your council approves. Building regulation drawings add construction detail — structure, insulation, fire safety, ventilation and drainage — proving compliance with the approved documents. Planning is about whether you may build; building regs are about how you must build it.

Should I choose a full plans application or a building notice?

Full plans is safer for anything structural: your drawings are checked and approved before work starts, so problems surface on paper, not on site. A building notice skips plan checking, leaving your builder exposed to inspector decisions mid-build. For extensions, lofts and wall removals in London we almost always recommend full plans.

How long do building regs drawings take?

Most building regulation drawing packs are delivered within 7 days of instruction. A full plans application then typically takes building control around 5 weeks to approve, though approved inspectors can often move faster. Starting the regs pack while your planning application is being determined saves months overall.

Do building regulation drawings include structural calculations?

Our packs are coordinated with structural calculations for beams, steels, load-bearing removals and foundations, produced by structural engineers and embedded in the drawings. Building control requires calculations for any structural alteration, so we deliver drawings and calcs as one consistent package rather than two documents that contradict each other.

Can builders price accurately from your building control drawings?

Yes — that is half their purpose. Because every wall build-up, steel, insulation spec and drainage run is drawn and annotated, builders can quote like for like without padding for unknowns. Clients regularly find competitive, comparable quotes easier to obtain with a detailed regs pack than with planning drawings alone.

Do you cover building control in my area?

Yes — we prepare building regs drawings across all 33 London boroughs and the Home Counties, and submit to local authority building control or private approved inspectors, whichever suits your programme. The drawings comply with the national approved documents, so they are valid with any building control body in England.

Building regulations drawings by London borough

Local drawings tuned to each council's design guidance, with live borough approval rates. Pick your area:

Building regulations drawings for a Ealing project — technical construction details on site

Building regulations drawings in Ealing

Building regulations drawings in Ealing — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Wandsworth project — technical construction details on site

Building regulations drawings in Wandsworth

Building regulations drawings in Wandsworth — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Bromley project — technical construction details on site

Building regulations drawings in Bromley

Building regulations drawings in Bromley — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Barnet project — technical construction details on site

Building regulations drawings in Barnet

Building regulations drawings in Barnet — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Harrow project — technical construction details on site

Building regulations drawings in Harrow

Building regulations drawings in Harrow — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Sutton project — technical construction details on site

Building regulations drawings in Sutton

Building regulations drawings in Sutton — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Richmond upon Thames project — technical construction details on site

Building regulations drawings in Richmond upon Thames

Building regulations drawings in Richmond upon Thames — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Kingston upon Thames project — technical construction details on site

Building regulations drawings in Kingston upon Thames

Building regulations drawings in Kingston upon Thames — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Camden project — technical construction details on site

Building regulations drawings in Camden

Building regulations drawings in Camden — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Islington project — technical construction details on site

Building regulations drawings in Islington

Building regulations drawings in Islington — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Haringey project — technical construction details on site

Building regulations drawings in Haringey

Building regulations drawings in Haringey — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Enfield project — technical construction details on site

Building regulations drawings in Enfield

Building regulations drawings in Enfield — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Waltham Forest project — technical construction details on site

Building regulations drawings in Waltham Forest

Building regulations drawings in Waltham Forest — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Hillingdon project — technical construction details on site

Building regulations drawings in Hillingdon

Building regulations drawings in Hillingdon — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Hounslow project — technical construction details on site

Building regulations drawings in Hounslow

Building regulations drawings in Hounslow — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Hammersmith and Fulham project — technical construction details on site

Building regulations drawings in Hammersmith and Fulham

Building regulations drawings in Hammersmith and Fulham — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Kensington and Chelsea project — technical construction details on site

Building regulations drawings in Kensington and Chelsea

Building regulations drawings in Kensington and Chelsea — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Westminster project — technical construction details on site

Building regulations drawings in Westminster

Building regulations drawings in Westminster — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Merton project — technical construction details on site

Building regulations drawings in Merton

Building regulations drawings in Merton — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Lambeth project — technical construction details on site

Building regulations drawings in Lambeth

Building regulations drawings in Lambeth — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Croydon project — technical construction details on site

Building regulations drawings in Croydon

Building regulations drawings in Croydon — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Hackney project — technical construction details on site

Building regulations drawings in Hackney

Building regulations drawings in Hackney — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Newham project — technical construction details on site

Building regulations drawings in Newham

Building regulations drawings in Newham — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Redbridge project — technical construction details on site

Building regulations drawings in Redbridge

Building regulations drawings in Redbridge — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Barking and Dagenham project — technical construction details on site

Building regulations drawings in Barking and Dagenham

Building regulations drawings in Barking and Dagenham — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Havering project — technical construction details on site

Building regulations drawings in Havering

Building regulations drawings in Havering — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Greenwich project — technical construction details on site

Building regulations drawings in Greenwich

Building regulations drawings in Greenwich — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Lewisham project — technical construction details on site

Building regulations drawings in Lewisham

Building regulations drawings in Lewisham — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Bexley project — technical construction details on site

Building regulations drawings in Bexley

Building regulations drawings in Bexley — full-plans construction drawings for building control, revised free until approved.

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Building regulations drawings for a Southwark project — technical construction details on site

Building regulations drawings in Southwark

Building regulations drawings in Southwark — full-plans construction drawings for building control, revised free until approved.

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