An NHBC inspector is a qualified site inspector employed directly by the National House Building Council who visits new build homes at key construction stages to check that the work meets NHBC's technical standards. NHBC registration and the associated Buildmark warranty are a condition of the mortgage offer from most major UK lenders for new build homes. The inspector works on behalf of NHBC (not the developer or the buyer) and their role is to assess compliance with NHBC's Standards - a comprehensive technical standard for new house construction that sits alongside the Building Regulations.
What they do
- Carry out foundation stage inspection before concrete is poured
- Inspect drainage installation and backfill
- Inspect floor slab and ground floor construction
- Inspect structural frame, floors and roof structure
- Inspect external walls, windows and external envelope
- Inspect insulation installation and airtightness measures
- Carry out pre-completion inspection and issue completion certificate
- Record non-compliant items and require remediation before sign-off
- Investigate warranty claims and determine liability under Buildmark
When you need one
NHBC inspectors are engaged automatically when a new home is registered with NHBC. Registration is required before construction begins.
Typical costs (UK, 2025)
| Job type | Typical cost |
|---|---|
| NHBC registration and warranty premium (new build) | £1,500 - £4,000 |
| Stage inspections | Included in premium |
| NHBC resolution service | Free to homebuyers |
| Expert report for NHBC claim (independent) | £400 - £900 |
NHBC registration fees are paid by the developer and typically passed on in the house price. The premium is based on the build cost and the number of plots. Self-builders pay direct to NHBC.
Frequently asked questions
What is NHBC Buildmark?
NHBC Buildmark is the most widely used structural warranty in the UK, provided by the National House Building Council. It covers new build homes for 10 years - 2 years of developer guarantee followed by 8 years of structural warranty against major structural defects. It is required by most mortgage lenders for new build purchases.
How many NHBC inspections are there?
NHBC typically carry out 8-12 inspections during construction of a new home, from foundations through to completion. The number depends on the construction type and complexity. Inspections cover foundations, drainage, frame, roof structure, insulation, and external and internal finishes.
What does the NHBC Buildmark cover?
Years 1-2: the developer must fix defects at their own cost; NHBC can intervene if the developer fails to do so. Years 3-10: NHBC covers the cost of repairing major structural defects including subsidence, heave, foundation failure and major defects in key structural components such as the roof structure, external walls and floors.