Building Regulation Drawings: Requirements, Costs and Examples
work is intended to meet the Building Regulations. They are commonly prepared for projects such as extensions, loft and garage conversions, structural alterations, flat conversions and new homes. Unlike planning permission drawings that mainly explain a project’s appearance, scale and use, Building Regulation drawings focus on how it will be built safely and compliantly.
This guide is written primarily for homeowners, landlords and developers carrying out work in England. It explains when drawings may be needed, what a typical package includes, the difference between Full Plans and a Building Notice, likely cost factors and the mistakes that can delay Building Control approval.
Quick answer
For most extensions, conversions and structural alterations, detailed drawings give Building Control and the contractor the information needed to assess and build the work. The exact documents depend on the project and application route. A Full Plans application normally requires more technical information than a Building Notice and provides a formal decision on the submitted plans.
What Are Building Regulation Drawings?
Building Regulation drawings translate a design into technical construction information. They show the proposed layout together with details such as foundations, walls, floors, roofs, insulation, ventilation, drainage, fire precautions and structural elements. Notes and specifications may sit on the drawings or in a separate document.
The purpose is to demonstrate how the proposed building work can satisfy the functional requirements of the Building Regulations. The government’s Approved Documents provide guidance on common ways to meet those requirements, although other compliant solutions may be possible.
If you are still deciding which type of approval applies, see planning permission versus Building Control before progressing your drawings.
Building Regulation Drawings vs Planning Drawings
| Planning drawings | Building Regulation drawings |
|---|---|
| Focus on the proposal’s scale, appearance, layout, access and relationship to the site. | Focus on construction, safety, energy performance, ventilation, drainage and other technical requirements. |
| Used to support a planning application or permitted development evidence where required. | Used to support Building Control assessment and to give contractors clearer construction information. |
| May not contain enough detail for pricing or construction. | Normally contain sections, specifications and construction details beyond a planning set. |
| Reviewed against planning policy and material planning considerations. | Assessed against the Building Regulations and relevant technical requirements. |
A project may need both sets. Planning permission and Building Regulations approval are separate processes, and obtaining one does not remove the need to check the other.
When Do You Need Building Regulation Drawings?
Building Regulations apply to many types of building work in England. Drawings are particularly useful, and are usually expected for a Full Plans application, where the work involves several interacting technical requirements.
- House extensions and additions
- Loft, garage and basement conversions
- Removal or alteration of load-bearing walls
- House-to-flat and flat-to-house conversions
- New dwellings and substantial outbuildings
- Changes affecting fire safety, drainage, insulation or ventilation
- Commercial alterations and changes of use
For an extension, it is sensible to coordinate the technical package with your extension planning drawings and any structural calculations before construction starts.
Some limited work may be exempt or may be self-certified through a competent person scheme. Requirements also differ for higher-risk buildings, which follow the Building Safety Regulator process. Confirm the correct route for your project before starting work.
Need drawings prepared for your project?
What Does a Building Regulation Drawing Package Include?
The content should be proportionate to the project. A straightforward domestic extension will need a different package from a new apartment building or complex commercial alteration. A typical residential set may include the following.
General arrangement drawings
- Existing and proposed floor plans
- Existing and proposed elevations where relevant
- Sections through the proposed work
- Key dimensions, levels and construction references
Construction details and specifications
- Foundation, ground floor, wall, upper floor and roof build-ups
- Insulation thicknesses and target thermal performance
- Damp-proofing, weathering and cavity details
- Stair, guarding and accessibility details where applicable
Structure and coordination
The package may identify beams, lintels, padstones, load paths and foundation assumptions. Structural calculations and engineer-designed details are often provided separately and must be coordinated with the architectural drawings.
Fire safety
Depending on the project, drawings may show protected escape routes, fire-resisting construction, fire doors, smoke alarms and separation between uses. The requirements for a house extension will differ from those for flats, HMOs and higher-risk buildings.
Ventilation, energy and services information
Relevant information may cover ventilation rates and extract locations, insulation and glazing performance, heating and hot-water provisions, drainage layouts and electrical safety notes. Specialist designs may be needed where systems are complex.
Building Regulation Drawings Examples
The building regulation drawings examples below show how the contents of a technical package can change according to the proposed work. Each project requires its own details, but these examples demonstrate what Building Control and contractors would normally expect to see.
Example 1: Single-storey extension
Example 2: Loft conversion
Example 3: Load-bearing wall removal
Example 4: House or flat conversion
Implementation requirement:
Insert anonymised AA Drafting drawing images here, with a descriptive caption and alt text. Ideally add downloadable sample PDFs beneath it. Remove the project address and personal information, and confirm that the examples are suitable for publication. Each example should explain what would usually appear on the plans, section drawings, construction details and supporting documents.
Who Can Prepare Building Regulation Drawings?
Building Regulation drawings may be prepared by an architectural design technician, architect or another competent designer with suitable knowledge of the work. Structural engineers and specialist consultants may contribute calculations or designs for structure, drainage, energy, fire safety or building services.
Homeowners can prepare information themselves for some projects, but responsibility remains with the people carrying out and commissioning the work. Incomplete or poorly coordinated information can lead to queries, revisions and on-site changes. Professional input is particularly valuable where the work affects structure, fire safety, several dwellings or an existing complex building.
Full Plans vs Building Notice
Route | How it works | Best suited to |
Full Plans | Detailed plans and supporting information are assessed before or during the early stage of work. The local authority issues a decision on the submitted plans. | Projects where clearer pre-construction assurance and a coordinated technical package are important. |
Building Notice | Less information is normally submitted before work starts. Compliance is checked through site inspections, without a formal approval of plans. | Some smaller and relatively straightforward domestic work, subject to eligibility and local advice. |
Registered building control approver | For non-higher-risk work, a private registered building control approver can manage the building control process and give an initial notice to the local authority. | Eligible projects where the client chooses a registered private-sector provider. |
A Building Notice can reduce the amount of information required before work starts, but it does not reduce the need for compliant construction. It can expose the client and contractor to more uncertainty if technical problems emerge on site. Full Plans is often the more useful route when contractors need a detailed and coordinated package for pricing and construction.
How the Building Control Process Works
- Confirm whether Building Regulations approval is required and whether the project is a higher-risk building.
- Choose the Building Control route and provider. For eligible non-higher-risk work, this may be the local authority or a registered building control approver.
- Prepare coordinated drawings, specifications, calculations and any other supporting information.
- Submit the application or notice and pay the relevant Building Control charges.
- Respond to technical queries and revise the information where necessary.
- Notify Building Control at the required stages so inspections can take place.
- Resolve outstanding items and obtain the appropriate completion documentation when compliant work is finished.
Applications to participating Building Control bodies can also be made through the Planning Portal Building Control service.
How Long Does Approval Take?
Timescales depend on the route, project complexity, quality of the submission and the Building Control body’s workload. A local-authority Full Plans application has a statutory decision period, commonly five weeks unless an extension is agreed, but technical revisions and coordination can make the overall design process longer. A Building Notice follows a different route and does not result in formal approval of submitted plans.
Allow time before construction for structural calculations, energy information and responses to technical queries. Starting without coordinated information can lead to delays that outweigh any time saved at submission stage.
How Much Do Building Regulation Drawings Cost?
There is no single fixed price because the drawing package must reflect the property and proposed work. A quotation for preparing the drawings should be kept separate from Building Control application and inspection charges.
Cost area | What affects it |
Drawing preparation | Project size, complexity, existing information, survey requirements and number of construction details. |
Structural engineering | Number and complexity of beams, openings, foundations and other load-bearing changes. |
Specialist information | Energy calculations, drainage design, fire strategy, acoustic information or building services design where required. |
Building Control charges | Application route, type and value of work, local fee schedule and inspection requirements. |
Revisions | Design changes after submission, incomplete information or unexpected site conditions. |
Ask for a project-specific quotation that states what is included, which consultants are excluded and whether submission support or amendments are covered.
Common Mistakes That Delay Approval or Construction
Using planning drawings as construction information
Planning drawings may show the approved design without the technical detail needed for Building Control or the contractor. Confirm whether a separate technical package is required.
Missing or inconsistent details
Floor plans, sections, structural calculations and specifications should describe the same design. Conflicting beam positions, wall thicknesses or levels can generate queries and errors on site.
Relying on outdated requirements
Check the current Building Regulations Approved Documents and the transitional provisions that apply to the project. A previous drawing note or standard detail may no longer be appropriate.
Leaving specialist information too late
Structural calculations, energy assessments, drainage proposals or fire-safety input can change the architectural details. Identify these dependencies early and coordinate them before work begins.
Assuming approval guarantees compliant workmanship
Approved or accepted information does not replace competent construction and inspection. Contractors must follow the design, notify Building Control at the required stages and address any site-specific issues.
Get a project-specific quotation
What to Check Before You Submit
- The correct property address, client details and description of work are shown.
- Existing and proposed drawings use consistent dimensions, levels and references.
- Key construction build-ups and performance requirements are stated.
- Structural information matches the architectural design.
- Fire safety, ventilation, drainage and energy requirements have been considered.
- Supporting calculations and specialist documents are attached where needed.
- The correct Building Control route and provider have been confirmed.
- The contractor will have access to the latest coordinated issue of the drawings.
Building Regulations Across the UK
This guide focuses on England. Wales has its own Building Regulations guidance and administrative arrangements, while Scotland uses the building standards system and Northern Ireland has separate Building Regulations. If the property is outside England, use the guidance and approval route for that nation.
FAQs
In some non-higher-risk cases work may start before a Full Plans decision, but doing so can create financial and technical risk if changes are required. Higher-risk building work requires Building Safety Regulator approval before it starts. Confirm the position with the relevant Building Control body.
They are often separate documents prepared by a structural engineer. The drawings should reference and coordinate with the engineer’s design, but you should check the quotation to confirm responsibilities and inclusions.
A detailed and coordinated Building Regulation package is useful for pricing and construction, but the required level of construction information varies. Ask the designer and contractor whether further schedules, specifications or specialist details are needed.
No designer can guarantee approval. Accurate, current and coordinated information improves the application, but Building Control may request clarification or amendments and the completed work must still comply on site.
The appropriate next step depends on when the work was carried out, what it involved and the evidence available. Contact the local authority Building Control team before assuming that a retrospective route or certificate is available.
Plan the Technical Stage Before Work Begins
Ready to move your project forward?
Contact
Office Address
3-7 Sunnyhill Rd
Streatham Wells
Lambeth
London SW16 2UG
Opening Hours
Fri — 9am – 5pm
Sat — 9am – 2pm
Sun — Closed
