One of the most common questions we hear from clients is how long will my refurbishment take. It is a question that deserves an honest and detailed answer, because unrealistic expectations around timing are one of the biggest sources of frustration in any building project. Here is what you can realistically expect for a refurbishment in prime London.
The pre construction phase
Before any building work begins, there is a significant amount of preparation required. Design development, planning applications, building control submissions, party wall agreements, freeholder licences, and procurement all take time. For a comprehensive refurbishment, this pre construction phase typically takes three to six months. Rushing this stage almost always leads to problems later. At NU Projects the pre construction stage is where the planning effort goes, because that is what keeps a project on track once work begins.
Typical construction timelines
The duration of the construction phase depends on the size and complexity of the project. As a general guide, a full refurbishment of a two bedroom apartment in prime London typically takes four to six months. A large townhouse refurbishment with structural alterations might take eight to twelve months. A project involving a basement extension can add six to twelve months to the overall programme. These are realistic timescales for high quality work. Any contractor who promises significantly shorter programmes for complex projects should be questioned carefully.
What can cause delays
Delays in construction are common, but most are avoidable with proper planning. The most frequent causes include late design decisions, changes to the scope of work during construction, slow approval processes from freeholders or local authorities, supply chain issues with specialist materials, and unforeseen structural or building fabric problems revealed during demolition. Weather can also affect programmes, particularly for projects involving external works or roof alterations. At NU Projects, we build realistic float into our programmes and communicate proactively when any issue arises that could affect the timeline.
How we keep projects on track
Effective programme management requires discipline, communication, and experience. We produce detailed construction programmes at the start of every project and update them regularly. Our clients receive weekly progress reports with clear commentary on what has been completed, what is coming next, and whether the programme is on track. We hold regular site meetings with the design team to review progress and resolve any issues quickly. That structure is how a programme is held to, and how a slip is spotted while there is still time to act on it.
Why the sequence matters
The order in which work is carried out has a significant impact on the overall programme. Efficient sequencing means that different trades can work in parallel without getting in each other’s way. Poor sequencing leads to trades standing idle, waiting for access, and the programme extending unnecessarily. An experienced contractor sequences the trades so the work keeps moving without cutting into quality or safety.
Ready to plan your timeline?
If you are planning a refurbishment in London and want a realistic view of how long it will take, we can help. We will assess the project and prepare a detailed programme.
To talk to the team, send two lines through the contact form. You can also call 020 7731 6841. We usually reply within a few hours, weekends included.
Published 13 April 2026. Written by the NU Projects studio, edited since for house style and accuracy.