Renovation Timing in London: When Is the Right Time to Start?

**Contractor availability and pricing:** London construction is highly seasonal. Demand for renovation contractors peaks in spring (March–June) and autumn (September–November), when homeowners aim to complete works before summer outdoor season or the Christmas period. Demand is lower in January–February and July–August.

• **Implications:**
• •Booking a contractor during peak periods typically means longer waiting times — good London contractors often have 3–6 months forward booking at peak season
• •During lower-demand periods (January–February), some contractors are more flexible on price and programme — but the effect is less pronounced than in many other sectors
• •In practice, the best contractors are busy year-round — availability is determined by the contractor's order book, not just the season

**Material prices:** Construction material prices in London are influenced by global commodity prices (steel, copper, timber), UK import costs, and local supply/demand. Material prices increased significantly in 2021–2023 and have stabilised somewhat in 2024–2026. There is no reliable seasonal pattern that makes one time of year materially cheaper than another for materials.

**Planning consent timing:** If your project requires planning permission, the programme before work can start is fixed by the planning process — 8 weeks for a valid application (major projects longer), plus drawing production and condition discharge. The planning submission can be made at any time. Submit as soon as the design is ready rather than waiting for a particular season.

**Interest rates and financing:** If the project is financed via a renovation mortgage, personal loan, or equity release, the prevailing interest rate environment affects the cost of financing. In 2026, UK interest rates remain relevant to this calculation — if you are financing the project, factor borrowing costs into the total cost analysis.

• **The most common non-reasons for delay:**
• •'We're waiting until the children are older' — renovation with young children is genuinely disruptive but rarely benefits from waiting, as the children grow but circumstances rarely simplify
• •'We're waiting for prices to fall' — construction costs in London have shown a long-term upward trend over 10-year periods; brief corrections are rare and difficult to time
• •'We're waiting to save more' — renovation costs are unlikely to be lower in future than they are today when inflation is factored in
• •'We're waiting until we've decided what we want' — this is a legitimate design preparation step, but it can become indefinite without a deadline

• **Genuine reasons to delay:**
• •Planning has not been obtained and is uncertain — starting design investment without planning certainty is a risk worth carefully considering
• •A major life event (job change, new baby, health issue) is imminent — renovation during major personal disruption significantly increases stress
• •The property is under offer for sale — renovating a property you are selling is rarely cost-effective
• •The existing property condition is adequate for the current phase — phasing works deliberately (loft conversion now, rear extension in 3 years) is a legitimate strategy where budget or disruption require it

• **The opportunity cost of delay:**
• •Every year of delay means another year living in a property that does not meet your needs
• •For investment-focused projects (a loft conversion to add a lettable bedroom, a refurbishment to improve rental yield), delay has a direct financial cost
• •Construction costs in London typically increase at 3–6% per year over the long term — a £150,000 project delayed by 2 years costs approximately £159,000–£169,000 at that inflation rate

For a project requiring planning permission (rear extension, double-storey extension, loft conversion beyond PD), a realistic minimum timeline from decision to start on site:

• •**Month 1–2:** Appoint designer/architect; initial design development
• •**Month 2–3:** Pre-application planning advice (if needed)
• •**Month 3–4:** Architectural drawings complete; planning application submitted
• •**Month 5–6:** Planning decision received (8 weeks statutory)
• •**Month 6–7:** Condition discharge, structural engineering, tender package
• •**Month 7–9:** Contractor tender and appointment
• •**Month 9–10:** Start on site

For a project within permitted development (standard loft conversion, straightforward side extension within PD limits):

• •**Month 1:** Appoint contractor / design-and-build team
• •**Month 1–2:** Design and structural engineering
• •**Month 2–3:** Building Regulations application, contractor mobilisation
• •**Month 3:** Start on site

**The best time to start is when the preparation is complete.** There is no perfect market moment — the most reliable path to a good outcome is adequate preparation, not optimised timing.