A structural survey is a detailed investigation of a building’s structural elements — walls, floors, roof, foundations, and frame — to identify defects, assess their severity, and recommend remedial action. Unlike a standard homebuyer report, which provides a condition rating, a structural survey provides engineering-based analysis of specific structural concerns.

This guide explains what a structural survey involves, when you should commission one (including as a buyer or existing homeowner), what defects structural engineers commonly find, and what surveys typically cost in 2025.

Types of Property Survey: Where Does a Structural Survey Fit?

There are several types of property survey in the UK, which can cause confusion:

Survey Type	Who Produces It	What It Covers
Mortgage Valuation	Surveyor appointed by lender	Confirms the property’s value for mortgage purposes only; does not assess condition
RICS Homebuyer Report (Level 2)	RICS surveyor	Condition ratings for all accessible elements; highlights issues requiring further investigation; does not include structural calculations
RICS Building Survey (Level 3)	RICS surveyor	Comprehensive visual inspection; detailed condition assessment; repair recommendations; does not include structural engineering analysis
Structural Survey / Engineer’s Report	Structural engineer	Engineering analysis of specific structural concerns; calculations; remedial recommendations

A structural survey is not a standard “Level 3” building survey — it is specifically commissioned to investigate structural concerns identified by a Level 2 or Level 3 survey, or to investigate specific visible defects such as cracking, settlement, or structural movement.

When Should You Commission a Structural Survey?

When Buying a Property

A structural survey is typically commissioned when a Level 2 or Level 3 homebuyer or building survey flags potential structural issues, including:

• Significant cracking to internal or external walls
• Evidence of movement or settlement
• Distorted window frames or sticking doors
• Out-of-level floors
• Bulging walls
• Roof spread (walls pushed outward by roof thrust)
• Evidence of past or active subsidence
• Failed or missing lintels above openings

As an Existing Homeowner

Existing homeowners commission structural surveys when new defects appear, including:

• New or worsening cracks appearing in walls or ceilings
• Doors or windows starting to stick suddenly
• Floors becoming noticeably uneven
• Visible movement in roof structure
• Before starting extension or alteration works, to understand the existing structure

Before Extension or Structural Alteration Works

If you are planning to extend, convert a loft, or remove walls, commissioning a structural survey of the existing building before design work starts ensures the design is based on accurate knowledge of the structure. It identifies hidden defects that could affect the design or cost of the works.

What Does a Structural Survey Involve?

A structural survey by a qualified structural engineer typically involves:

• Visual inspection: Systematic inspection of all accessible structural elements — walls, floors, roof structure, foundations, drainage
• Crack assessment: Classification of cracks by size, pattern, and likely cause (using BRE crack classification guidance)
• Movement assessment: Use of levels, plumb bobs, and other instruments to quantify movement
• Investigation of specific concerns: May include opening up work, ground investigation, trial pits, or endoscope inspections of cavities
• Written report: Engineering analysis of findings, assessment of severity, cause of defects, and recommended remedial action with cost ranges

Common Findings in Structural Surveys

Cracking and Movement

The BRE classification rates cracks from Category 0 (hairline, cosmetic) to Category 5 (very severe, requiring major structural repair). Most cracks in residential properties are Categories 0–2 and are cosmetic or the result of normal thermal movement. Category 3 and above cracks may indicate foundation movement or structural failure and require investigation.

Subsidence

True subsidence — movement of the ground below the foundations — is less common than many homeowners fear. The most common causes are: clay shrinkage due to nearby tree roots, leaking drains washing away soil, and mining subsidence in former industrial areas. Ground investigation is required to confirm subsidence and specify appropriate remediation.

Failed Lintels

Lintels above windows and doors carry the masonry load from above. In older properties, lintels may be timber (which rots), steel (which corrodes), or inadequate in size. A failed lintel causes progressive cracking above the opening and may eventually require emergency propping and lintel replacement.

Roof Spread

In older properties without adequate ceiling ties, roof thrust from the rafters can push the top of the wall outward. Signs include cracking at the wallhead and a bulge in the wall just below the eaves. Remediation typically involves installing new tie rods or wall plates.

Structural Survey Cost in 2025

Survey Type	Typical Fee Range (2025)
Structural engineer’s report on specific defect (cracking, lintel)	£400–£800
Full structural survey of 3-bedroom house	£600–£1,200
Full structural survey of large house or period property	£1,000–£2,500
Ground investigation / trial pits (additional)	£300–£800 per pit
Subsidence investigation report	£800–£2,000

Frequently Asked Questions

Is a structural survey the same as a building survey?

No. A building survey (RICS Level 3) is a visual condition assessment by a surveyor — it covers all elements of the building and provides condition ratings. A structural survey is an engineering analysis by a structural engineer, focusing specifically on structural elements and providing technical calculations and remedial recommendations. The two complement each other — a building survey may recommend a structural survey for specific concerns.

Should I get a structural survey before buying a house with cracks?

Yes — if the seller has not already provided a structural engineer’s report on the cracks, commissioning one before exchange is essential. The cost (£400–£800) is trivial compared to the potential cost of structural remediation, and the report may provide grounds for renegotiating the purchase price or requiring the vendor to carry out remedial work as a condition of exchange.

How long does a structural survey take?

A site visit for a standard structural survey typically takes 2–4 hours. The written report is usually produced within 1–2 weeks of the visit. Urgent reports can often be turned around in 3–5 working days at additional cost.

Who should I use for a structural survey?

Use a qualified structural engineer (MIStructE or CEng) rather than a general building surveyor for structural investigations. Structural engineers have specific training in structural behaviour, load paths, and engineering analysis that general surveyors do not. Crown Architecture & Structural Engineering provides structural surveys across the UK — call 07443804841 to discuss your requirements.

Does a structural survey affect the property’s insurance?

A structural survey report does not in itself affect your insurance. However, if the report identifies active subsidence or structural defects, your insurer may restrict cover or increase premiums once they are made aware — as you are legally obliged to disclose material facts. Resolving identified defects before renewal is the best approach.

Commission a Structural Survey

Crown Architecture & Structural Engineering provides structural surveys and defect investigations for residential properties across the UK. Our reports are clear, actionable, and prepared by qualified structural engineers with full professional indemnity insurance.

Call 07443804841 or complete the enquiry form above to arrange a structural survey.