Prime central London refurbishments and extensions: what really drives cost

Why the price per square metre is only a guide
Budgets matter, yet real costs depend on a handful of choices. Price per square metre is a useful starting point, but it cannot capture structure, access, heritage, services and finish. Our role is to make those choices visible early, then design and procure in a way that keeps spending predictable. Your priority might be comfort, speed, or a certain level of finish. We plan for that from the start.

The big cost drivers explained simply
Scope and structure have the biggest effect. New openings, basements or major alterations need careful engineering and temporary works. Services also shape cost and comfort. Heating, cooling, ventilation and hot water require space for plant and risers, and smart planning keeps ceilings and storage generous. Access and neighbours matter in central London. Limited delivery windows and shared entrances add time unless the plan is thoughtful. Heritage and permissions can influence both specification and programme. Many addresses in Mayfair, Belgravia, Marylebone and Kensington sit in conservation areas or have listed features, so we shape proposals that respect the building while meeting your brief. Premium finishes need early decisions. Stone, bespoke joinery and metalwork benefit from mock-ups so quality is clear before orders are placed.

How P+P Architects protects your budget
We begin with a clear brief and an order-of-cost so priorities are understood before design is fixed. We prepare coordinated drawings and specifications that contractors can price fairly and build well. We recommend a procurement route that fits risk, from a two-stage tender to a single main contractor. Once on site, we keep scope disciplined and answer queries quickly, which avoids drift and rework.

Who we help and how we work
We support homeowners, investors and asset managers across prime central London. Whether it is a full flat refurbishment, a sensitive extension or coordinated upgrades to a portfolio, we tailor the process to you and your building. Expect regular updates, tidy information and decisions made at the right time.

Your next step with us
Ask for a short feasibility study. You will receive layout options, a simple cost range, a programme outline and planning advice. It is a low-stress way to move forward with confidence.
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Where to find us
P+P Architects, 27 Milford Mews, London SW16 2UA. P+P Architects