What is a Snagging List?

A snagging list — sometimes called a snag list or snagging checklist — is a formal record of defects, incomplete works and quality issues on a construction project that the contractor is required to rectify. It is a standard part of the construction handover process, used by employers' agents, contract administrators and project managers to document outstanding items before and around practical completion.

In UK construction, snagging applies across all project types: commercial offices, industrial and logistics, education, healthcare, public sector, and residential development schemes. The format and scale of a snagging list will vary — from a single consolidated schedule on a straightforward commercial fit-out to a multi-specialist, plot-by-plot programme on a large housing development — but the underlying purpose is the same: ensuring that works are delivered to the required standard before the client takes occupation or handover is certified.

The term is also commonly associated with new build residential properties, where developers or their representatives carry out snagging inspections before handover to purchasers. On schemes managed on behalf of a developer client or funder, this process forms part of BuildAlliance's wider project and quality management remit — the perspective of this guide is that of the client-side professional team, not the individual homebuyer.

Snagging in the Construction Programme

Effective snagging does not begin at the end of a project — it runs throughout. On projects managed by BuildAlliance, we maintain a running inspection log from early in the construction programme, recording quality and workmanship issues as they arise rather than allowing them to accumulate. Defects caught early, when the relevant trade is still on site, are far cheaper and quicker to resolve than those left until completion.

This proactive approach involves:

  • Regular quality inspections tied to construction programme milestones
  • A maintained defects log shared with the contractor and site management team
  • Prompt issue of remedial work instructions and agreed response timescales
  • Verification that items have been adequately resolved before sign-off
  • Escalation of recurring quality failures to the contractor's management

As the project approaches its completion date, a formal final snagging inspection is undertaken. This produces a consolidated snagging list of all items outstanding at the point of handover. On a well-managed project, this list is significantly shorter than it would be under a reactive, end-of-project-only approach — a direct result of the quality management carried out throughout the programme.

The final snagging inspection is typically timed to occur shortly before the anticipated practical completion date, allowing the contractor a clear window to remedy outstanding items prior to handover.

What a Commercial Snagging List Should Cover

A commercial snagging inspection should cover all elements of the building works, assessed against the contract specification and applicable standards. The scope will vary by project but typically includes the following:

Structure and Fabric

  • Masonry, concrete and structural elements — cracks, settlement, misalignment
  • Roof coverings — missing, damaged or incorrectly laid components
  • External envelope — cladding, weatherproofing, sealed junctions and interfaces
  • Windows and curtain walling — alignment, operation, weather seals and locking mechanisms

Mechanical and Electrical (M&E)

  • Heating, ventilation and air conditioning systems — tested, balanced and commissioned
  • Electrical installations — circuits tested, distribution boards labelled, sockets and switches operational
  • Plumbing and drainage — no leaks, correct falls, drainage tested under pressure
  • Fire alarm, emergency lighting and life safety systems — commissioned and signed off by a competent person
  • Building management system (BMS) — integrated, calibrated and handed over with full documentation

Internal Finishes

  • Plastered and decorated surfaces — no hollowness, cracking, staining or paint defects
  • Screeds and floor finishes — flat, bonded, no hollow areas or damaged sections
  • Suspended ceilings — tiles correctly installed, no gaps, damage or misalignment
  • Joinery — doors, frames and ironmongery aligned, operational and to specification
  • Tiling and hard flooring — no cracked, uneven or incorrectly grouted tiles

External Works

  • Hard and soft landscaping — completed to specification and drawing
  • Drainage and kerbing — correct levels and falls, gullies clear
  • Car parking, access roads and surface finishes
  • External lighting, fencing, gates and boundary treatments

Statutory Compliance and Documentation

  • Building Regulations completion certificate and sign-off
  • Gas, electrical and mechanical commissioning certificates
  • O&M manuals, warranties, guarantees and as-built drawings
  • Building safety documentation as required under applicable regulations

A well-structured commercial snagging list records not just what the defect is, but where it is located, when it was identified and what remedial action is required. On larger projects this will reference area, floor, room or grid reference to allow efficient tracking by the contractor's site team.

Snagging and Practical Completion

Snagging is closely linked to the point of practical completion — the stage at which the contractor has substantially completed the works and the client is able to take possession and use the building for its intended purpose.

Under most standard form contracts, including the JCT suite, practical completion does not require the works to be entirely defect-free. Minor snagging items are typically acceptable at practical completion, provided they do not prevent the building from being used or occupied for its intended purpose. The contract administrator or employer's agent has professional discretion over what constitutes a "minor" defect — and this judgement is one of the more consequential decisions in the handover process.

Where items on the snagging list are more significant — particularly where they affect safety, structural integrity, statutory compliance or fitness for purpose — practical completion may be withheld until they are resolved. This is both a contractual matter and a question of professional judgement, and the employer's agent or contract administrator must be in a position to justify their assessment.

Items on the snagging list that are not resolved before practical completion are carried forward and managed during the defects liability period. The contractor's obligation to remedy those items does not end at handover.

On residential development schemes, practical completion is typically certified on a plot-by-plot or phase basis, with each unit handed over sequentially. Managing snagging across multiple simultaneous completions requires a structured, well-resourced approach and clear communication between the developer client, site team and employer's agent.

The Schedule of Defects Under JCT Contracts

Under JCT contracts, there is an important distinction between the pre-completion snagging list and the formal schedule of defects issued at the end of the defects liability period.

The defects liability period — typically six or twelve months after practical completion under JCT standard form contracts — is the period during which the contractor remains obligated to return to site and rectify defects that emerge. These may include items carried over from completion, or latent defects that only become apparent during the building's use.

At the end of the defects liability period, the contract administrator or employer's agent issues a schedule of defects — a formal contractual document listing all outstanding defects the contractor must remedy. Once the contractor has rectified those items and the work is accepted, the contract administrator issues the certificate of making good, which triggers the release of any remaining retention monies held by the employer.

Key points under JCT regarding the schedule of defects:

  • The contractor must be given written notice of defects during the defects liability period — verbal notification is not sufficient
  • The employer cannot require the contractor to remedy items that do not arise from a failure to comply with the contract
  • Under JCT SBC/Q, the schedule of defects must be issued no later than 14 days after expiry of the defects liability period
  • The contractor is entitled to a reasonable period in which to complete the remedial works
  • Where the contractor fails to remedy defects, the employer may engage others to do so and recover the cost under the contract
  • Retention is not fully released until the certificate of making good is issued by the contract administrator

The schedule of defects is therefore a formal contractual mechanism with defined obligations and timescales — quite distinct from the practical snagging list used at handover. Both are important, but they serve different purposes and operate at different points in the project lifecycle.

For a full overview of how JCT contracts are structured, see our guide to JCT contracts and the range of JCT contract types.

The Defects Liability Period

The defects liability period gives the contractor both the right and the obligation to return to site and remedy defects after practical completion. During this period, the client should maintain a structured record of any defects that emerge and notify the contractor — via the contract administrator or employer's agent — in writing and within a reasonable time.

Failure to properly record and notify defects during the defects liability period can undermine the client's ability to enforce the contractor's obligation to rectify them. A maintained defects log, timely notification and clear documentation of the contractor's response are all essential to protecting the client's contractual position.

Where the contractor is slow to respond or disputes individual items, the employer's agent or contract administrator must manage the process firmly — using the contractual mechanisms available to ensure remediation is completed within the agreed timeframe and before the schedule of defects is issued.

Our full guide to defects liability periods covers the legal and contractual framework, the employer's obligations, and how the period ends with the certificate of making good.

Who Manages the Snagging Process?

On a professionally managed construction project, snagging is coordinated by the Employer's Agent or Contract Administrator — the client's representative responsible for administering the building contract and acting as the interface between client and contractor throughout the project.

Their role in the snagging process includes:

  • Conducting and coordinating snagging inspections throughout the programme
  • Issuing and tracking snagging lists to the contractor with agreed response timescales
  • Re-inspecting completed items and confirming written sign-off
  • Managing the defects log during the defects liability period
  • Issuing the schedule of defects at the end of the defects liability period
  • Certifying making good and releasing retention on behalf of the client

On complex or specialist projects, snagging may involve input from multiple consultants — mechanical and electrical engineers, structural engineers, acoustic consultants, building services commissioning managers — each inspecting specific elements of the works. In these cases, the employer's agent or project manager coordinates the overall snagging process, consolidating specialist reports and ensuring a complete picture is presented to the contractor without gaps between scopes.

This is the model BuildAlliance operates on projects across commercial, public sector and residential development schemes — maintaining oversight of the snagging process from early in the programme, coordinating specialist input where required, and ensuring the client's position is protected throughout.

Our Employer's Agent and Project Management services include full snagging and defects management as standard.

Snagging Formats: One Schedule, Room-by-Room or Multi-Specialist

The format of a snagging list should be tailored to the project. There is no single correct approach — the right format is the one that enables the defects to be tracked efficiently and ensures nothing is missed.

Single Consolidated Schedule

On straightforward commercial projects — a single building, a fit-out or a smaller construction scheme — a single consolidated schedule covering all elements by trade or element is often the most efficient approach. Items are listed with location, description, trade responsible and target completion date, and the schedule is updated as items are resolved.

Room-by-Room or Area-by-Area

On projects with complex internal layouts — hotels, schools, healthcare facilities, office buildings with multiple tenanted areas — a room-by-room or floor-by-floor format allows the snagging list to mirror the structure of the building. This makes it easier to coordinate the contractor's remediation programme and to demonstrate progress to the client.

Multi-Specialist Coordination

Where specialist consultants are engaged to snag specific elements — M&E systems, structural works, acoustic performance, building envelope — their individual inspection reports feed into a master snagging schedule coordinated by the employer's agent or project manager. This ensures no items fall between the scopes of different consultants, and that the contractor receives a single, consolidated picture of all outstanding works.

Residential Development Schemes

On residential development schemes — whether apartment buildings, housing estates or mixed-use schemes — snagging is managed on a plot-by-plot or phase-by-phase basis. Each unit is inspected and snagged individually, with a separate completion record maintained for each plot. This requires careful programme management to coordinate simultaneous completions, manage contractor resources across the site, and ensure each purchaser or incoming occupier receives a property that has been properly inspected and signed off.

Where BuildAlliance acts as employer's agent or project manager for a developer client or funder, we manage this process across the scheme — maintaining oversight of plot completions, coordinating with the sales and legal process, and ensuring the developer's obligations to incoming occupiers are met.

The format should be agreed with the contractor at the outset of the snagging process, so there is no ambiguity about how items are referenced, tracked or closed out. A clear, consistently formatted snagging list reduces the risk of dispute and speeds up the remediation programme.

Risks of Poor Snagging Management

A poorly managed snagging process creates risk for the client at handover and beyond:

  • Missed defects at handover: items not recorded before practical completion are harder to enforce during the defects liability period, particularly once the contractor has demobilised from site
  • Programme and occupation delay: unresolved snagging items can delay occupation or cause disruption and reputational damage after the building is in use
  • Retention disputes: without proper sign-off records, the release of retention may be contested and prolonged
  • Loss of contractor obligation: defects not notified in writing during the defects liability period may not be enforceable under the contract
  • Latent defects missed: without a structured inspection process during the defects liability period, defects that develop over time may not be identified within the contractual period
  • Increased dispute risk: inadequate snagging records provide less evidential basis for enforcement if the contractor disputes whether an item is a genuine defect

Engaging an experienced employer's agent or project manager to oversee the snagging process — from early quality management through to the certificate of making good — is the most effective way to protect the client's position and ensure the project is delivered to the standard the contract requires.

Frequently Asked Questions

What is a snagging list in construction?

In construction, a snagging list is a formal record of defects, incomplete works and quality issues that the contractor is required to rectify. It is used by the employer's agent, contract administrator or project manager to document outstanding items and manage their resolution as part of the handover process.

What is the difference between a snagging list and a schedule of defects?

A snagging list is a practical quality management tool used before and around practical completion to record defects requiring remediation. A schedule of defects is a formal contractual document issued by the contract administrator at the end of the defects liability period under contracts such as JCT. The two serve different purposes and operate at different stages of the project lifecycle.

When should snagging take place on a construction project?

Snagging should begin well before the completion date, with quality issues recorded throughout the construction programme rather than left until the end. A formal final snagging inspection is then carried out as the project approaches practical completion. Proactive quality management throughout the programme significantly reduces the volume of items outstanding at handover.

Who is responsible for completing snagging items?

The contractor is responsible for rectifying defects on the snagging list within an agreed timeframe. The employer's agent or contract administrator is responsible for issuing the snagging list, agreeing timescales, re-inspecting completed items and providing written sign-off on behalf of the client.

Can a contractor refuse to complete snagging items?

Under standard form contracts such as JCT, the contractor is obligated to rectify defects arising from a failure to comply with the contract. Where the contractor disputes whether an item is a genuine defect, the contract administrator must make a professional judgement. Items that genuinely meet the contractual specification cannot be required to be remedied; items that fall below it must be.

What happens to unresolved snags after practical completion?

Snags not resolved before practical completion carry over into the defects liability period. During this period, the employer must notify the contractor of defects in writing. At the end of the defects liability period, the contract administrator issues a schedule of defects listing all outstanding items for final remediation. Once remediated, a certificate of making good is issued and remaining retention is released.

What is the difference between a snag and a defect?

In everyday use the terms are often interchangeable. Technically, a snag typically refers to a minor quality issue or incomplete item identified during or before completion. A defect has a more formal contractual meaning — an element of the works that does not comply with the contract — and may include latent defects that emerge after completion. The schedule of defects issued at the end of the defects liability period uses the term in its formal contractual sense.

Does a JCT contract require a schedule of defects?

Yes. Under JCT standard form contracts, the contract administrator is required to issue a schedule of defects after the expiry of the defects liability period. The contractor must then make good those defects within a reasonable time. Once satisfied, the contract administrator issues the certificate of making good, which triggers the release of remaining retention monies held by the employer.

Reviewed by Scott Edwards, Director, BuildAlliance — last updated June 2026.

Approaching Project Handover?

BuildAlliance manages snagging and defects across commercial, public sector and residential development schemes. We maintain proactive quality oversight throughout the programme and administer the full defects liability process on behalf of our clients.

Our Employer's Agent, Project Management and Post-Contract QS services include comprehensive snagging and handover management.

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