27 Cadogan Square
This Grade II listed townhouse at Cadogan Square exemplifies the partnership between visionary design and rigorous financial management. Studio Havn’s sensitive restoration honours the property’s historic architectural integrity whilst introducing refined contemporary interiors, natural materials, warm finishes, and bespoke joinery with precision to enhance the properties character.
Bonavia Ltd as Quantity Surveying was essential to realising this ambitious vision within the constraints of listed building delivery. We developed detailed cost planning throughout the design evolution, translating the architect’s vision into financial certainty. Our comprehensive Schedule of Works and Pricing Schedule provided the procurement framework essential for contractor selection and competitive tendering. Crucially, our on-site role throughout the construction phase ensured continuous oversight; managing costs, resolving variations, and safeguarding quality from commencement through practical completion
Walton Street, Knightsbridge, London
Bonavia Ltd was appointed as quantity surveyor on a prestigious residential refurbishment and extension on Walton Street, Knightsbridge; one of London’s most coveted prime central addresses. Engaged across the full project lifecycle, from early stage cost planning and feasibility through tender, contract administration, and final account settlement, we provided the client and their wider professional team with precise, reliable cost intelligence at every stage, ensuring that design ambition and financial rigour remained in close alignment throughout this high specification scheme.
Berkeley Gardens, London, W8
This project comprised the transformation of a dilapidated London townhouse into a single high-end private residence. Situated in Notting Hill within the Royal Borough of Kensington and Chelsea (RBKC), the scope of works included a rear extension at ground and first floor levels, the amalgamation of an existing lower ground floor apartment, and a full internal refurbishment throughout. Bonavia Ltd managed the process of securing a more advantageous VAT position for the client in relation to the development.
Bonavia Ltd provided detailed cost plans at each stage of design, together with a comprehensive Schedule of Works and Pricing Schedule to support the tender process and the appointment of the Principal Contractor. We also delivered on-site Project Management and Quantity Surveying service throughout the construction phase, through to the project’s successful completion. Client: Leufroy Limited
Passyunk Play – Waterloo
Bonavia Ltd provided Project Management and Quantity Surveying services for the new Passyunk Play, an extension of the original Passyunk Avenue restaurant in Leake Street arches (Waterloo).
We agreed a procurement strategy with the client, and tendered individual trade packages for the works. Following a successful tender process, we agreed the trade packages and entered into contracts with a principal contractor, mechanical, electrical and catering contractors / suppliers.
The project was successfully completed October 24.
6 Upper Grosvenor Street
A modern workplace redefined behind a historic façade, this Grade II listed building in the heart of Mayfair has been successfully transformed into the European headquarters for a distinguished California-based client. The project secured planning permission to upgrade and convert the property into a high-specification office environment, while carefully respecting and preserving its architectural heritage.
The completed works comprised extensive external and internal alterations, including the demolition of the existing mansard roof to accommodate a new roof structure and lift shaft, significant basement alterations, and a full internal refurbishment. Particular care was taken to retain and enhance the building’s listed features, resulting in a super prime 7,300 sq ft office space of exceptional quality.
Bonavia Ltd had the privilege of providing full Quantity Surveying services, supporting the project from the earliest stages of pre-construction through to successful completion and handover. Our appointment included the preparation of cost plans at each design stage, a detailed Schedule of Works and Pricing Schedule to facilitate the appointment of the Principal Contractor, and the delivery of a comprehensive on-site QS service throughout the construction phase.
St Stephen’s Cresent
The conversion of a dilapidated HMO into 19 luxury short let apartments is located between Notting Hill and Paddington. The building is not listed but located within a conservation area. The works included the extension of the stucco-fronted block with a full internal refurbishment to increase the value of the rental accommodation.
Bonavia Ltd provided the client with advice on the appointment of a Principal Contractor and delivered a full on-site QS service for the duration of the project until its successful completion.
Town Hall Hotel
Town Hall Hotel is an Art Deco, 5-star hotel located in lively East End London. This project involved the replacement of the heating and cooling FCU’s to all areas of the hotel. This also included refurbishment of hotel bathrooms, main plant replacement, leak detection systems and fire stopping works, all while the hotel remained occupied. Notwithstanding the occupancy of the hotel, this project provided several logistical challenges, especially with limited front or rear access.
Bonavia Ltd provided the client with early-stage cost advice, programme, logistical strategies and management of the PCSA (Pre-Construction Services Agreement) with the Principal Contractors. We are delivering a complete on-site PM/QS service over the multiple phases of the project.
65 Elsham Rd
This project involves the conversion of a former dilapidated residence into 10 luxury apartments in Central London.
Bonavia Ltd provided the client with Cost Plans at each design stage and a Detailed Schedule of Works / Pricing Schedule to facilitate the tendering and the appointment of a Principal Contractor. We are delivering a comprehensive on-site PM/QS service for the duration of the project.
137–143 NOTTING HILL GATE
This property was a mixed-use block, comprising residential and office space arranged over basement, ground, and three upper floors. The client was granted planning permission to convert the office space into 4 separate luxury residential units.
Bonavia Ltd provided the client with a feasibility stage cost advice and pre-construction services, which involved a Cost Plan at each design stage and a Detailed Schedule of Works / Pricing Schedule to facilitate the tendering and the appointment of a Principal Contractor. Bonavia Ltd are providing the client with a comprehensive on-site QS & PM service for the duration of the project.
7 Philbeach Gardens
This project involved the conversion of a dilapidated London townhouse into 3 luxury two-bedroom apartments. located in the Earls Court District of Kensington & Chelsea, the works included an extension to the rear basement / ground floor, refurbishment of the upper floors and the amalgamation of the existing 4,300 square feet units.
Bonavia Ltd provided the client with Cost Plans at each design stage and a Detailed Schedule of Works / Pricing Schedule to facilitate the tendering and the appointment of a Principal Contractor. We delivered a comprehensive on-site PM/QS service for the duration of the project until its successful completion.