AI-generated illustration of a construction planning discussion. This is not a photograph of a completed Marwells project.
When planning a home improvement or a new house, you may hear that the work must meet Building Regulations, follow British Standards and satisfy NHBC or LABC requirements. These are connected, but they describe different responsibilities and protections. Choosing a building control provider does not remove the need for good design, a clear contract or suitable insurance.
For projects in England, start with the legal requirements. Then establish who will check compliance, which technical specifications the team will use, and whether a separate warranty is required. This guide explains those layers, using information checked on 21 October 2026. Requirements elsewhere in the UK differ. [1, 2]
The main terms at a glance
- Building Regulations: Legal requirements applying to relevant building work. [1] What the homeowner should establish: Which requirements and application route cover this project?
- Approved Documents: Government guidance giving ways to meet those requirements. [3] What the homeowner should establish: Which editions and project details support compliance?
- LABC: The local authority building control network. [4] What the homeowner should establish: Which council service is handling the application and inspections?
- NHBC: Provides technical standards, warranty products and a building control service. [6, 7] What the homeowner should establish: Exactly which services are included for this project?
- LABC Warranty: A separate structural warranty offering, working with LABC. [8] What the homeowner should establish: What policy, exclusions and inspection conditions apply?
- British Standards: Technical standards addressing particular products, methods or performance. [9] What the homeowner should establish: Which standards and editions are specified in the design or contract?
Building Regulations come first
Building Regulations cover new buildings, extensions and many alterations, including relevant loft conversion work. Planning permission is a separate process, so a project can need both. Permitted development status should never be treated as proof that Building Regulations approval is unnecessary. Check the position before committing to a start date. [1]
Approved Documents organise guidance by subject, including structure, fire safety, ventilation and energy efficiency. They provide practical routes to compliance; they are not the regulations themselves. [3] Alternative solutions can be acceptable, but the designer must demonstrate that the relevant legal requirements are met. An unfamiliar construction system therefore needs appropriate evidence, not simply a supplier's assurance that it is modern or superior. [5]
Who provides building control
For work outside the higher-risk building regime, the usual choices in England are a local authority building control service or a private Registered Building Control Approver. Work involving higher-risk buildings follows the Building Safety Regulator route, subject to the applicable exceptions. A typical domestic project should still have its route confirmed rather than assuming every building follows the same process. [2]
Local authority teams assess submitted plans, calculations and specifications and inspect work at relevant stages. A Building Notice, where available and appropriate, does not provide the advance plan approval associated with a full plans application. Ask your designer which route suits the project's complexity and how unresolved details will be dealt with before construction. [4]
The designer and contractor remain responsible
England's Building Regulations dutyholder rules place responsibilities on clients, designers and contractors. Domestic clients must allow sufficient time and resources, provide relevant information and appoint competent people. The principal designer and principal contractor coordinate compliance in their respective phases where those roles apply. Building Regulations appointments should be clear; similarly named roles under construction health and safety legislation have different duties. [10]
Building control provides independent regulatory oversight. It does not supervise every operation, identify every defect, act as a clerk of works or replace the contractor's quality checks. The government's 2026 independent panel report makes these limits explicit. If you want additional independent monitoring of workmanship and progress, agree that service separately with an appropriately competent professional. [11]
When do NHBC Standards apply
NHBC Standards set technical requirements for new homes registered with NHBC. They may therefore be an important part of a new-build specification, but they are not a universal alternative to Building Regulations. Ask whether the proposed home is registered, which warranty product is intended and what technical requirements apply. [6]
Edition dates matter. NHBC states that its 2027 Standards apply to homes whose foundations begin on or after 1 January 2027. Publication of a new edition does not mean it automatically applies to every ongoing project. Record the applicable edition and any transition arrangements in the project information. [6]
NHBC also currently provides building control as a Registered Building Control Approver. Its building control service and warranty cover have distinct functions, even where both are involved in the same development. The appointment and policy documents should make the scope clear. [7]
How British Standards fit into the specification
British Standards provide technical criteria for particular subjects. BSI explains that standards are generally voluntary, although legislation or contractual obligations can make particular requirements binding. Referencing a standard can also provide evidence supporting a proposed compliance solution. A claim that a whole house is “built to BS” is too broad to tell a homeowner what has actually been specified. [9]
Ask for the relevant standard number, edition and application. For example, a specification should identify the requirements for the particular material or installation, rather than merely saying “British Standard quality”. Where drawings, a warranty manual and a manufacturer's instructions appear to conflict, the designer should resolve the detail before materials are ordered. The site team needs one coordinated instruction, with the decision recorded.
A ten year promise needs written terms
A completion or final certificate concerns the building control process. It is not an insurance policy or a promise that every element will remain defect-free. A contractor's guarantee, a manufacturer's product guarantee and an insurance-backed structural warranty should each be identified separately. Ask who provides the protection, what triggers a claim and what happens if that organisation stops trading. [11]
LABC Warranty works alongside local authority building control, but its structural warranty is a separate arrangement. Using a council building control service does not, by itself, purchase that cover. Ask for the named policy and confirm that it meets any requirements from your lender or professional advisers. [8]
NHBC Buildmark illustrates why the details matter: its cover includes a two-year builder warranty period backed by NHBC, followed by eight years of insurance for defined damage arising from defects in specified parts of the home. Terms, exclusions and financial limits apply. This is not ten years of unlimited cover for every maintenance issue or later alteration. Confirm the cover offered for your own project in its contract and policy documents. [12]
What this means for an extension or new home
For an extension, ask the team to show how the structural design, insulation, ventilation and junction with the existing house are coordinated. A useful project discussion might follow one detail from the drawing to the order, installation inspection and final record. That makes the standard of work tangible instead of relying on a general promise of compliance.
For a new home, discuss the proposed building control route and any lender or warranty requirements at the design stage. For a loft conversion, agree who resolves discoveries such as an existing beam differing from the survey. These examples share the same practical principle: investigate the actual condition, obtain the designer's decision and update the project information before the affected work proceeds.
Questions to settle before signing the contract
- Who is responsible for design coordination, construction coordination and booking statutory inspections?
- Which drawings, specifications, standards and warranty requirements form the agreed scope?
- Are application fees, specialist calculations, testing and certification included in the price?
- Which work must be inspected before it is covered, and who records the evidence?
- How will design changes and product substitutions be reviewed, priced and approved?
- What guarantee or insurance policy is included, and can you read its terms before committing?
Build the handover file while work is happening
Agree a document schedule at the outset. Depending on the project, it may include the building control completion or final certificate, final drawings, structural calculations, inspection and test records, relevant installation certificates, commissioning information, operating instructions and warranty documents. Ask which records are required, which are useful supporting evidence and who will supply each one.
Keep revised drawings and approved changes alongside the original specification. Photographs of concealed work are particularly useful when labelled by location and date, although they do not replace an inspection or prove compliance on their own. A well-organised handover file helps you understand what was built and gives future owners or advisers a clearer record.
Discuss your project with Marwells
Marwells helps homeowners plan extensions, loft conversions and new homes with engineering input and coordinated construction. Bring your drawings, priorities and any lender or warranty requirements to the discussion so the responsibilities and scope can be agreed early. Contact info@marwells.co.uk or call 07340 094028 to discuss your project.
Related: Residential construction · Construction consultancy and project management · Request a project quote
Sources and further reading
- GOV.UK: Building regulations approval: when you need approval
- GOV.UK: Building regulations approval: how to apply
- GOV.UK: Approved Documents
- LABC: About local authority building control
- CNC Building Control: Do I need to follow the Approved Documents?
- NHBC: NHBC Standards
- NHBC: Building Control Services and Inspection
- LABC: LABC Warranty
- BSI: What you need to know about standards and the law
- GOV.UK: Design and building work: meeting building requirements
- GOV.UK: Building Control Independent Panel report, May 2026
- NHBC: Your Buildmark cover
