Practical Completion and Handover in London Renovations: What to Check and What to Secure

Practical completion is the formal milestone at which a construction contract is considered complete: the contractor has finished the works, the client takes possession, and the contractual defects liability period begins. In a luxury London renovation, the transition from construction to occupied property requires more than a handshake and a key exchange — it requires a structured process that protects both parties and provides the client with everything they need to occupy and manage the completed building.

This guide covers how to define, conduct, and document practical completion in a London renovation.

Defining practical completion

Practical completion is a legal concept — it does not mean perfect completion. Under standard JCT contracts (the most widely used contract form in UK residential renovation), practical completion occurs when the works are completed in all material respects, even if there are minor outstanding items. The practical completion certificate is issued by the contract administrator (architect or project manager) when they are satisfied that this standard has been reached.

The distinction matters because: - Possession passes to the client at practical completion — the client can occupy the property - Half the retention is released to the contractor at practical completion (the other half is released at the end of the defects liability period) - The defects liability period starts — the period during which the contractor is obliged to return and remedy defects - The contractor's insurance obligation for the works changes — the client's buildings insurance must cover the completed property from this point

A contractor who refuses to acknowledge practical completion until every minor snag is resolved is misapplying the standard. A client who refuses to grant practical completion because of a handful of minor outstanding items without substantial justification may be in breach of contract. The architect or project manager's judgement on whether the threshold has been reached is key.

The snagging inspection

Before issuing a practical completion certificate, a thorough snagging inspection should be conducted. In a high-specification London renovation, this is typically a 2–3 day process.

Who conducts the inspection: The contract administrator (architect or project manager) conducts the formal inspection for contract purposes. Some clients appoint an independent snagging inspector (a specialist firm such as New Home Snagging Inspections or a chartered surveyor) for additional rigour. For a luxury renovation, both approaches have merit — the architect's knowledge of the design intent combines with an independent inspector's systematic approach.

What is inspected: Every room, every surface, every fitting. A systematic room-by-room approach prevents omissions.

*Walls and ceilings:* Flat, uniformly finished, free of cracks wider than hairline, correctly painted (no misses, runs, or brush marks), cornice and plasterwork repairs flush and matched.

*Floors:* Level, free of hollow sections (tap test on tiled floors), no cracked tiles, no gaps between boards, thresholds flush and secure.

*Joinery:* Doors and windows open and close freely, latch and lock correctly, no binding, no sticking. Skirting, architrave, and cornice mitres tight with no gaps. Fitted furniture doors and drawers aligned and operating smoothly.

*Wet rooms and bathrooms:* All fixtures secure, no movement on basin or toilet. Silicon joints complete, even, and properly tooled. Shower trays drain correctly. No hollow or loose tiles. Hot and cold supplies functional at correct temperature.

*Kitchen:* All appliances functioning (test each one). Cabinetry doors and drawers aligned. Worktop joints tight. Plinth and cornice mitred and fitted.

*Mechanical and electrical:* All light fittings functioning. Switches and sockets secure and level. Heating functional (check at all zones). MVHR running. Alarm system tested and handed over. Extraction fans operational. Thermostatic controls calibrated.

*External:* Gutters connected and discharging. External drainage running correctly. Paths and hard surfaces free of cracks and depressions. Any external decoration complete.

The snag list: Every defect identified is logged in a numbered snag list with a description, location, and (if appropriate) a photograph. The snag list is issued to the contractor with a reasonable rectification period (typically 2–4 weeks for a list of minor items).

Items on the snag list that are truly minor (a paint touch-up, a silicon bead that needs smoothing) should not prevent practical completion. Items that affect the habitability or use of the property (a shower that does not drain, a door that will not lock, a heating system that does not function) must be resolved before practical completion is granted.

Documents to obtain at handover

The handover documentation package is as important as the physical condition of the property. Missing documents cause problems on future sale, remortgage, and insurance claims.

Building control: - Final building control completion certificate (from local authority or approved inspector) - This confirms the structural, fire, thermal, drainage, and electrical works comply with Building Regulations

Planning: - Copy of any planning consent and all conditions - Evidence of compliance with pre-commencement conditions (materials approval letters, arboricultural method statements if required) - Any Conservation Area or Listed Building consent

Party wall: - Party Wall Award(s) for all served notices - Schedule(s) of Condition for neighbouring properties

Structural: - Structural warranty certificate (if applicable — required for any significant new structural work) - Structural engineer's completion certificate (confirming construction matches design)

Mechanical and electrical: - Electrical Installation Condition Report (EICR) or Electrical Installation Certificate (EIC) from the qualified electrician - Gas Safety Certificate from the Gas Safe registered engineer - MVHR commissioning report (confirming balanced flow rates) - Boiler commissioning certificate and service record - Air conditioning commissioning records - Any specialist system certificates (underfloor heating, smart home commissioning, alarm system)

Specialist systems: - Flat roof system guarantee certificate (from membrane manufacturer) - Damp-proofing guarantee (if applicable) - Timber treatment guarantee (if applicable) - Window warranty certificates

As-built drawings: - Architectural drawings updated to reflect any changes from the tender set - Structural drawings as built - MEP (mechanical, electrical, plumbing) services drawings showing the routing of all services — essential for any future alteration

Maintenance manuals: - Boiler, MVHR, and heating system manuals and service schedules - Kitchen appliance manuals and warranty registration - Smart home system user guides and programming documentation - Lift maintenance manual (if applicable) - Pool system manual (if applicable)

The health and safety file

For projects notifiable under the Construction (Design and Management) Regulations 2015 (CDM) — broadly, any project lasting more than 30 working days with more than 20 workers simultaneously, or exceeding 500 person-days — a Health and Safety File must be compiled and handed over to the client at completion. The file contains information relevant to the future safe operation and maintenance of the building: structural drawings, service routes, hazardous materials survey results, and maintenance requirements.

For smaller residential renovations below the CDM threshold, a maintenance and building information pack serves the same purpose informally.

Keys, access, and security handover

Keys: A complete key schedule — every lock, every key, and how many copies exist. The contractor should return all keys cut during the project. Change all locks or re-key all cylinders at handover — the contractor's team, subcontractors, and any visitors to the site during construction may have had access.

Access control: For properties with smart locks, keypad access, or access control systems, re-programme all codes and biometrics at handover. Revoke any contractor access credentials.

Alarm system: Walk through the alarm system with the alarm company's engineer — confirm all zones, confirm the monitoring contract, change all codes. Ensure every household member is enrolled on the system and knows the codes.

CCTV: Confirm all cameras are operational and recording. Change the system password from the default or contractor-set value.

Defects liability period management

After practical completion, the defects liability period (typically 6 or 12 months) begins. During this period:

Report defects promptly: Keep a running log of defects as they appear. Issues reported promptly (within the defects period) are the contractor's obligation to rectify at no cost. Issues discovered after the defects period ends are no longer the contractor's obligation under the contract.

Distinguish defects from damage: A cracked tile caused by settlement or a poorly fixed substrate is a defect; a cracked tile caused by a heavy object being dropped on it is damage (the client's liability). Be honest in reporting.

End-of-defects inspection: At the end of the defects period, conduct a second inspection. Issue a final snag list to the contractor. Once this list is resolved, the contract administrator issues the certificate of making good defects, and the second half of the retention is released.

Retain the retention: The retention in the contract (typically 2.5–5% of the contract sum, half held back at practical completion) is the financial lever that motivates the contractor to address defects. Do not release it early; hold it until the end-of-defects inspection is satisfactorily concluded.

Cost and programme implications

Snagging inspection (independent specialist): £800–£2,500 for a full house. Making good defects (contractor's obligation, no client cost if within defects period): N/A. Lock re-keying or replacement (full property): £500–£2,000. Handover documentation compilation (architect's time): typically 3–5 hours, included in overall architect fee.

The handover process takes 2–4 weeks from the initial snagging inspection to completion of all snag rectification and formal issuance of the practical completion certificate. For a luxury renovation, this process is worth conducting thoroughly — the documentation secured at this point protects the investment for the entire life of ownership.