Post-Renovation Maintenance: How to Protect Your Investment After Handover

A well-executed renovation is an investment of time, disruption, and significant money. The return on that investment — both in terms of the quality of the living environment and the property's value — depends substantially on what happens after handover.

High-specification finishes, bespoke joinery, and complex building systems all require care. Those that are neglected deteriorate faster and cost more to restore than those that are maintained consistently. This is a guide to what a proper maintenance programme looks like for a renovated London home.

What the defects liability period covers — and does not cover

Most construction contracts include a defects liability period (DLP) — typically 12 months from practical completion — during which the contractor is obliged to return and remedy any defects that become apparent. This is sometimes called a "snagging period" or "rectification period."

The DLP covers defects — items that fail because of poor workmanship or materials. It does not cover:

• —Fair wear and tear — paint marking, carpet wear, surface scratches
• —Maintenance items — replacing consumables, adjusting seasonally-moving timber
• —Client-caused damage
• —Items excluded from the contract scope

Many clients are disappointed to discover that cracking plaster (which is normal in the first year of a newly plastered and heated building), minor movement in timber joinery (normal seasonal movement), and paint marking in high-use areas (fair wear) are not defects the contractor is obliged to remedy. These are maintenance items.

Understanding this distinction at handover — and having a realistic conversation with your contractor about what is a defect and what is maintenance — prevents conflict later.

The first year: what to expect

Plaster cracking: New plaster applied over a masonry substrate will crack slightly as the building dries out and the heating is used for the first time. Hairline cracks at junctions (wall/ceiling, wall/architrave), and occasionally in field areas, are normal. These should be filled at the end of the first heating season, not immediately — further movement may occur. If cracks are wide (over 2mm), recurrent, or structural in character, they should be investigated.

Timber movement: Bespoke timber joinery — doors, windows, fitted furniture — will move slightly as the building's humidity stabilises after occupation. Doors that stuck in summer may swing freely in winter. New oak flooring may show slight gapping between boards in winter. This is normal. Maintaining indoor humidity at 45–55% RH (using humidifiers in winter if required) minimises movement.

Paintwork: New paint in high-use areas (door edges, handle areas, skirting boards) will show wear within the first year. This is fair wear. Plan a touch-up programme at 12–18 months.

Annual maintenance items

External: - Gutters and downpipes: clear in autumn, after leaf fall. A blocked gutter causes water ingress — one of the most common sources of damp in period properties - External joinery: inspect timber windows and doors for paint failure, particularly at sill junctions. Repaint or reseal before any bare timber is exposed to water - Roof: visual inspection for missing or slipped slates, displaced ridge tiles, or blocked valley gutters. An annual check, especially after winter storms, prevents small problems from becoming large ones - Terrace drainage: clear drain channels and grilles of leaves and debris

Internal services: - Boiler service: annual. A gas safe registered engineer; required to maintain manufacturer warranty; discovers problems before failure - MVHR/HRV service: filter replacement every 6–12 months; heat exchanger cleaning annually - Underfloor heating: annual check of manifold pressures and zone valves - Water softener: salt replenishment as required; service every 2–3 years - Swimming pool (where applicable): chemical dosing, filter backwash, equipment service — these are ongoing operational tasks, not periodic maintenance

Finishes: - Natural stone floors: reseal annually in high-use areas (kitchens, entrance halls); every 2–3 years in lower-traffic spaces - Timber floors: annual inspection for scratches; refinish every 5–10 years depending on use - Specialist plaster finishes: inspect for any cracks or damage; repair with the original material and technique - Silicone seals (bathrooms, kitchens): inspect annually; replace any failing or mould-affected silicone. Silicone has a typical life of 5–8 years

Five-year items

• —External redecoration: a well-prepared and painted external elevation on a London period property should hold for 5–7 years before full redecoration is required. Budget for it.
• —Kitchen worktops: stone worktops should be resealed every 5 years. Inspect for chips and cracks; stone can be repaired but chips left untreated absorb staining
• —Roof: a more thorough inspection by a roofing contractor every 5 years. Flat roofs, leadwork, and flashings have finite lives that depend on specification and maintenance

Managing maintenance for a London property when abroad

Many owners of high-specification London properties are not permanently resident in the UK. Managing maintenance from abroad requires:

A property manager or managing agent: Someone who can act on your behalf for routine and emergency maintenance. Costs typically £1,500–4,000 per year for a management fee, plus costs of any works instructed.

Automated monitoring: Leak detection sensors (at plant rooms, under sinks, near washing machine connections), temperature monitoring (to alert if heating fails in winter), and CCTV systems accessible remotely allow remote oversight of the property's condition.

Trusted contractor relationships: A contractor you can call to attend at short notice, who knows the property and its systems, and who will give you an honest assessment rather than an inflated quote. ASAAN provides this service for clients who have completed renovation projects with us.

The cost of not maintaining

The cost of proper maintenance for a high-specification London home is typically 0.5–1% of the property value per year. For a £3m townhouse, that is £15,000–30,000 per year in maintenance, service contracts, and periodic redecoration. This sounds significant; it is modest relative to the cost of remedial works when maintenance has been deferred.

A gutters-not-cleared problem is £200 to fix when the gutters are cleared, and £8,000–25,000 when the resulting damp has penetrated the wall and damaged plaster, joinery, and structure. A silicone seal that fails and leaks unnoticed for two years into a floor void below a shower can cost six figures to put right.

Maintenance is not a cost. It is the means by which a renovation investment retains its value.

ASAAN's post-renovation service

For clients who have completed renovation works with ASAAN, we offer a retained maintenance service: annual inspections, management of service contracts, attendance for reactive issues, and coordination of any remedial works. We know the property, the specification, and the contractors.

If you would like to discuss a maintenance programme for your property, contact us.