Project Handover and Snagging in Luxury London Renovation: Managing the Final Phase

In construction contracts, practical completion — the formal milestone at which the building is considered complete and the client takes possession — is a specific legal event with significant financial and contractual consequences. The rectification period (also called the defects liability period) begins at practical completion; the retention held by the client is released in two parts, the first on practical completion and the second at the end of the rectification period. The employer's risk insurances transfer back to the client. The contractor's obligation to maintain and heat the building ends.

In practice, the transition from construction to occupation is rarely a clean line. Buildings are completed progressively — the kitchen is finished weeks before the loft; the ground floor is habitable while the master bathroom is still being tiled. Managing this transition — deciding when practical completion is appropriate, what is genuinely snagging and what is incomplete work, and how to ensure the rectification period is used productively — is one of the most practically significant project management skills in luxury renovation.

What Practical Completion Is and Is Not

Practical completion is a contractual milestone, defined in JCT and NEC contracts with slight variations. Under JCT, practical completion is achieved when the works are "practically complete" — when the building can be occupied for its intended purpose, even if minor items remain outstanding. The architect or contract administrator certifies practical completion; the certificate cannot be withheld simply because a snagging list exists, provided the items on it are genuinely minor.

Practical completion is appropriate when: - The building is habitable and safe for occupation - All major systems are operational (heating, hot water, electrical, ventilation) - The building envelope is weathertight - Remaining items are cosmetic or minor — paint touch-ups, fitting adjustments, minor tile grout issues, door adjustments

Practical completion should not be certified when: - Major incomplete works remain (an entire room not finished, a system not commissioned) - There are Building Regulations sign-off items outstanding - The building is not safe or habitable in a material respect

Clients sometimes pressure architects to defer practical completion to avoid losing the second-half retention. This is usually a mistake: it delays the start of the rectification period (during which the contractor's obligation to return and rectify defects continues) and conflates the contractual milestone with the operational reality of whether the building is finished.

The Snagging Process

A snagging list is a record of defects, incomplete items, and non-conformances that must be rectified before or during the rectification period. In a luxury renovation, a comprehensive snagging list on a large project may contain 200–500 items; this is not unusual and does not indicate a poorly executed project. The number of items on a snagging list is less important than their severity and the rate at which they are resolved.

Who produces the snagging list:

The principal snagging inspection is typically carried out by the architect and/or project manager, who prepare a formal written schedule of items. This is distinct from the client's own walk-through, which will identify additional items — particularly those relating to personal expectations that may not be covered in the contract specification.

For a large or complex project, an independent snagging specialist can be appointed. Companies like Snagging Direct and New Home Snagging provide systematic inspection services, particularly valuable for clients without the technical background to identify construction defects behind cosmetic finishes.

Categories of snagging items:

*Category 1 — Safety and compliance*: Items that affect safety or regulatory compliance. Examples: fire door gaps out of tolerance, emergency lighting not working, protective barriers missing. These must be rectified before practical completion.

*Category 2 — Functional defects*: Items that affect the function of a system or element. Examples: drainage running slow, window not opening correctly, heating zone not responding to thermostat. Must be rectified during the rectification period.

*Category 3 — Cosmetic defects*: Items affecting appearance but not function. Examples: paint finish defects, tile grout gaps, skirting joints visible, door handles misaligned. The majority of items on most snagging lists. Must be rectified during the rectification period.

*Category 4 — Client preference items*: Things the client would like changed but that conform to specification. These are not defects — they require a variation instruction and potentially a cost adjustment. Distinguishing these from genuine defects is important both for managing contractor relationships and for cost control.

The rectification period:

Under JCT contracts, the rectification period is typically 12 months (6 months for smaller residential works). The contractor is obliged to return to site and rectify notified defects during this period without additional charge. At the end of the period, a schedule of defects is issued, the contractor has a final period to make good, and the final retention is released.

For this mechanism to work, defects must be notified to the contractor promptly. A client who accumulates a list of defects over 11 months and issues them all in month 12 is technically within their rights but creates a difficult relationship and a poor practical outcome. Notify defects as they are discovered; resolve them in batches rather than deferring.

Preparing for Occupation

Before moving in, a series of commissioning, demonstration, and documentation activities should be completed:

Building systems commissioning:

All mechanical and electrical systems must be commissioned — not just installed and switched on. Commissioning is the process of verifying that a system operates as designed across its full range of operating conditions. For a complex London renovation, this includes:

• —Underfloor heating: flow rates balanced, zone controls verified, all thermostats calibrated
• —Heating system: boiler or heat pump commissioned by a Gas Safe / OFTEC engineer, pressure tested, flow and return temperatures verified
• —Ventilation: MVHR flow rates balanced, extract rates verified in each room
• —Electrical: all circuits tested to BS 7671; RCDs and MCBs verified; test certificates issued
• —Drainage: flow tests; CCTV survey of new drainage runs
• —Security system: all zones tested; registered with police if connected to monitoring
• —Home automation: all scenes programmed, tested, and client-demonstrated

Operation and maintenance documentation:

A well-organised O&M (operations and maintenance) manual is a significant asset that clients frequently do not receive at handover — because assembling it requires effort from the contractor that is often left to the last moment and then not completed.

The O&M manual for a prime renovation should include: - As-built drawings for all services (electrical, plumbing, drainage, heating, AV) - Equipment schedules with manufacturer, model, serial number, and warranty information for all significant plant and fittings - Maintenance schedules (what needs servicing, by whom, and how often) - Manufacturer installation and operation manuals for all major equipment - Test certificates and commissioning records - Specialist supplier and contractor contact list

For a complex project, the O&M manual may run to several hundred pages. It should be provided in both digital and printed form. The digital version should be organised so that the client or their building manager can find a specific piece of equipment's maintenance requirements without reading the entire document.

Demonstrations and training:

All systems that the client or their staff will operate should be demonstrated in person. This typically includes: the heating and hot water system, the home automation system, the security system, the kitchen appliances, the AV system, and any specialist equipment (pool plant, lift, MVHR controls). A written guide for each system, supplementing the manufacturer's manual with property-specific settings and instructions, is good practice.

The Retention: Protecting the Client's Leverage

The contractual retention — typically 5% of the contract value, of which half is released on practical completion and half at the end of the rectification period — is the client's primary financial lever for ensuring defects are rectified. The second-half retention is often the only incentive a contractor has to return to site after practical completion; without it, minor snags may be ignored.

To protect this leverage: - Do not release the second-half retention until the schedule of defects has been fully resolved to your satisfaction - Document all defect notifications in writing (email is sufficient; a formal letter for significant items) - If the contractor fails to return to rectify notified defects, issue a formal notice under the contract requiring rectification within a specified period; failure gives the client the right to engage another contractor and deduct the cost from the retention

In practice, most reputable contractors resolve their defects without needing enforcement. The retention mechanism is a backstop, not the primary management tool.

ASAAN's Approach to Handover

ASAAN produces a formal snagging schedule at practical completion, carrying out our own pre-handover inspection before the client walk-through. We resolve all Category 1 and Category 2 items before handover where possible, so the client moves into a building that works. The O&M documentation package is prepared in parallel with the final construction phase rather than as a post-handover afterthought.

We maintain a live defects log through the rectification period and close it out systematically — not reactively. Our retention is released when the log is clear, not on the basis of elapsed time.

The handover of a property we have renovated should feel like a beginning — the start of the client's use of a home that works — not like the end of a protracted argument about what remains to be done.