Prime Residential Builders
in Radlett

A London prime contractor, minutes from Radlett

Crown Building has been delivering prime residential construction since 2013, and Radlett sits comfortably within the daily operating radius of our Watford headquarters. While much of our work is in the prime central London postcodes, Mayfair, Chelsea, Knightsbridge, Belgravia, our roots, our team and our registered office are minutes away. For homeowners in Radlett, that means a contractor working to a genuine prime residential standard, with senior management close enough to be on site whenever the project needs them.

We do not operate at volume. We compete on execution. The discipline that the best London projects demand, meticulous programming, a trusted specialist supply chain, senior management present on site throughout. Is exactly what we bring to a home in Radlett. The standard does not change with the postcode.

What we build in Radlett

Our residential work spans the full scope of high end building. We deliver architecturally distinctive new build homes, private residence refurbishments and structural reconfigurations, single and multistorey extensions, basement excavations, listed and period property works, and the bespoke joinery and interiors that define a finished home. Each project is delivered as design and build or contractor only, with Crown appointed as your prime residential main contractor, and transparent, itemised pricing from the outset. Commercial occupiers are served by the same teams through our commercial fit out division, and clinical and wellness premises through our healthcare and specialist environments team.

The roads off Watling Street, Newlands Avenue, Loom Lane, The Warren and their neighbours, carry plots that justify serious architecture, and Radlett has become a village where replacement new builds are as common as refurbishments. We deliver both: ground up contemporary homes with full smart home and leisure specifications, and comprehensive remodelling of the village's existing stock. Being ten minutes from site changes how a project runs, senior management attend routinely rather than occasionally, and the specialist trades we use across prime London are the same teams working here.

Areas we serve

We cover the whole of Radlett and its surrounds, Newlands Avenue, Loom Lane, The Warren, Watling Street, plus Shenley, Aldenham, Letchmore Heath and Elstree. You can see our full coverage, London within the M25 and a fifteen mile radius of our Watford headquarters, on our areas we cover page.

If you own a Radlett bungalow, you may not be able to add a storey

This is the most commercially important fact about building in Radlett, and it is easy to miss. Hertsmere has made three Article 4 Directions specifically removing the permitted development right to add a storey to named bungalows in the Radlett Neighbourhood Plan area. They remove Class AA of Part 1 and Classes AC and AD of Part 20 of the General Permitted Development Order.

The streets named include Theobald Street, Williams Way, Faggots Close, Craigweil Avenue, Newberries Avenue, Gills Hill Lane, Goodyers Avenue, Links Drive and The Close. Two of the directions were modified by the Secretary of State in June 2023 and a further group was confirmed in June 2024. Importantly, an ordinary loft conversion under other classes is not removed, so the position is more nuanced than a blanket prohibition and is worth establishing properly rather than assuming either way.

Radlett also has its own Neighbourhood Plan, which passed referendum in May 2021 and forms part of the statutory development plan. A scheme is assessed against it as well as against the borough policies.

Two conservation areas and eighty per cent Green Belt

Radlett has two conservation areas, North and South, with the North appraisal adopted in 2010. Article 4 Directions also cover Little Kendals Farm, Kendal Hall Farm and Kendal Wood.

Beyond the built up area, Green Belt policy governs. Eighty per cent of Hertsmere is Green Belt, and Policy SADM26 requires that a replacement building is not materially larger than the one it replaces and that extensions are not disproportionate to the original, judged on floorspace, volume, coverage of buildings and hardstanding, height and orientation. The baseline is the building as at 1 July 1948. Hertsmere sets no percentage cap, and the policy expressly notes that a basement level may count within the assessment, so excavating is not a route around the constraint.

Boulder clay, and why the ground here is its own problem

Radlett's geology is distinctive within the borough. Hertsmere's own evidence base records Reading Beds running in a band from Radlett to South Mimms and boulder clay around Radlett specifically, rather than the London Clay that dominates elsewhere in the borough.

Boulder clay is variable by nature, mixing clay with stone and gravel in ways that are not consistent across a plot, which makes assumptions unreliable and site investigation valuable. On the substantial detached houses and generous plots that characterise much of Radlett, where a scheme is likely to involve structural openings, a basement or a replacement dwelling, the cost of finding out early is trivial against the cost of discovering it during excavation.

Speak to us about your Radlett project

If you are planning a build, refurbishment or extension in Radlett, call us on 020 3675 3999 or book a free consultation here. Our registered office is Unit 324-B, The Wenta Business Centre, Colne Way, Watford, WD24 7ND.

Frequently asked questions

Where is Crown Building based?

Crown Building's registered office is at Unit 324-B, The Wenta Business Centre, Colne Way, Watford, WD24 7ND. We work throughout London within the M25 and across Hertfordshire and the Home Counties.

Which areas around Radlett do you cover?

We cover all of Radlett including Newlands Avenue, Loom Lane and The Warren, plus Shenley, Aldenham, Letchmore Heath and Elstree.

What does a new build in Radlett typically cost?

High specification new builds typically range from £210 to £325+ per square foot depending on scale and finish, with ultra premium specifications above that. We provide a detailed, itemised contract sum at tender stage, never a ballpark. Our refurbishment cost guide explains the tiers in detail.