Luxury Builders
in Marylebone & Regent's Park

Prime residential construction in Marylebone & Regent's Park

Crown Building works at the top of the London market, and Marylebone & Regent's Park is core territory for our team. The projects in our published case studies were delivered under exactly the constraints that define this part of London. Protected fabric, exacting consents, discreet site conduct and clients who judge the result at touching distance.

We do not operate at volume. We compete on execution. Meticulous programming, a trusted specialist supply chain and senior management present on site throughout are the baseline for every commission we accept in Marylebone & Regent's Park. The standard does not change with the scale of the project.

What we build in Marylebone & Regent's Park

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 Howard de Walden and Portman estates govern much of Marylebone, with the same licence to alter discipline we manage daily in Mayfair: a short walk south. Georgian terraces around Manchester Square and Bryanston Square, mansion block laterals on Chiltern Street's borders and the Grade I Nash terraces facing Regent's Park each carry their own consent regimes. Our Mayfair case study, delivered streets away, is the reference point for the specification and site conduct we bring here.

Areas we serve

We work across Marylebone and Regent's Park, Manchester Square, Bryanston Square, Harley Street, Chiltern Street, the Nash terraces and Park Village. Plus Fitzrovia and St John's Wood. 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.

Nash's terraces, and which side of the park you are on

John Nash's design still dominates Regent's Park: stucco terraces enclosing parkland, with isolated villas and the ornamental lake at the centre. The terraces differ in style but share a uniformity of design carrying forward Nash's townscape concept, even though his masterplan was never completed. Hanover Terrace, built 1822 to 1823 as part of the Regent's Park Crown Estate development, is listed Grade I: stucco, slate roofs, three storeys and basement.

A point that catches people out is that Regent's Park straddles a borough boundary. Hanover Terrace on the west side is City of Westminster, while Camden publishes its own Regent's Park Conservation Area Appraisal covering Chester Terrace to the east. The correct planning authority, and therefore the applicable basement policy and construction code, depends on which side of the park the property sits. Several of these terraces are also Crown Estate residential property held on long leases, which brings a landlord consent regime separate from planning.

Harley Street: a Special Policy Area that constrains change of use

If your property is in or around Harley Street, Westminster's Policy 26 designates a Special Policy Area supporting its role as an international centre of medical excellence, complemented primarily by residential use. Medical floorspace is protected. Converting it to residential requires evidence of vacancy and marketing for at least twelve months, together with a high quality residential proposal.

This is a genuine constraint rather than a formality, and it is one of the few places in London where a proposal to create a family home can fail on land use grounds rather than design. It sits over a conservation area whose character the Council describes as an eighteenth century Georgian core of townhouses at consistent, narrow plot widths, interspersed with later infill and Victorian and Edwardian mansion flats. Narrow plots matter practically: they limit what can be brought through the building and often rule out rear access entirely.

Basements, working hours and the cost of standing a vehicle

Westminster's city wide Article 4 Direction has removed permitted development rights for basements throughout the city since 31 July 2016, so every excavation requires a full application. The governing policy is Policy 50 of the City Plan following the January 2026 partial review, renumbered from Policy 45: fifty per cent of garden land, no more than one storey beneath the lowest original floor level, one metre of soil plus a 200mm drainage layer, and no more than 1.8 metres of encroachment under the highway with 900mm of cover retained. Applications must be accompanied by a structural methodology statement with self certification from a suitably qualified engineer.

Marylebone and Regent's Park fall in parking Zone F, where paid bays and single yellow lines are controlled from half past eight to half past six Monday to Saturday, and resident bays in several sub zones are controlled twenty four hours every day. In practice every day a vehicle or piece of plant stands on the street is a paid suspension, with ten working days' notice needed to suspend a residents' bay. On a narrow Marylebone plot with no rear access, that logistics cost is not a rounding error and we price it explicitly rather than absorbing it into a rate.

Speak to us about your Marylebone & Regent's Park project

If you are planning a refurbishment, basement or new build in Marylebone & Regent's Park, call us on 020 3675 3999 or book a free consultation here. Every enquiry is handled by a director.

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 Marylebone & Regent's Park do you cover?

We cover Marylebone, the Regent's Park terraces, Harley Street, Manchester and Bryanston Squares, Park Village, plus Fitzrovia and St John's Wood.

Do you work with the Howard de Walden and Portman estates?

Yes. Estate licence to alter packages, surveyor liaison and approved contractor conduct requirements are standard workflow for us across Marylebone, as on the Grosvenor estate in Mayfair.