Frequently asked questions

No. Consultations and written estimates are free and carry no obligation. For complex structural projects that need engineering or design work before a price is possible, we will explain any professional fees clearly before anything is commissioned.

Many loft conversions and single-storey extensions fall under permitted-development rights, but conservation areas, flats, maisonettes and larger designs usually require a full planning application.

We review your property's position at the start and handle the process — architectural drawings, submissions and liaison with local councils across London and the Home Counties.

Timelines vary with scope, but for a full-scale, high-end renovation clients should anticipate:

• Pre-construction (8–12 weeks): design, structural engineering and planning.
• Primary works (16–24 weeks): structural alterations, first-fix services and shell completion.
• Finishing phase (8–12 weeks): joinery, specialist finishes and commissioning.

Smaller projects move much faster — a bathroom typically takes 2–3 weeks on site and a kitchen 3–5 weeks.

Estimates are broken down by stage so you can see where every pound goes. Once scope is agreed, payments are staged against progress on site — you pay for work as it is completed, not large sums up front. We recommend holding a 10% contingency for the unforeseen issues that are common in older UK properties, and we bring you costs and options before any variation proceeds.

Yes — we carry comprehensive public and employer's liability insurance, and certificates are available on request. Our workmanship guarantee backs every project, qualifying structural works carry a 10-year structural warranty, and manufacturer warranties on appliances and systems are registered and passed to you at handover.

A named project manager — one person who surveys the job, prices it, runs the programme, manages the trades and walks the snag list with you at the end. You will never be passed between departments; that is the point of the name One Call.

We are based in Edgware and work across all of Greater London and the Home Counties — Hertfordshire, Middlesex, Surrey, Essex, Kent and Buckinghamshire. See the full list on our areas we cover page.

Absolutely — we regularly deliver projects designed by external architects and designers, and we are comfortable pricing from drawings and specifications. If you don't have a designer yet, we can introduce professionals we trust.