Cosawes Pascoe, Ponsanooth

At Cosawes Pascoe, near Ponsanooth in Cornwall, SMT Associates has helped shape the refurbishment and adaptation of a historic estate through a series of connected commissions.

Set within approximately 23 acres, the estate includes a Grade II listed Georgian house, cottage and substantial stone barn, together with former agricultural buildings. Our work has encompassed refurbishment of the house and cottage, conversion of a former cartshed, revision of an approved barn conversion and subsequent proposals for ancillary accommodation.

Our involvement has combined historic building research, measured and topographical surveys, design, planning and listed building applications with Building Regulations submissions and technical coordination.

The work demonstrates how individual buildings can be adapted to changing needs while retaining the character and relationships of the wider historic group.

Understanding the buildings and the clients’ ambitions

The clients initially approached SMT Associates with a clear vision for the property and its substantial barn. Bringing that vision forward required an understanding of each building’s construction, condition and significance, alongside the practical requirements of its proposed use.

Surveys, photographic records, historic research and examination of the existing fabric informed the design. The arrangement of the buildings, their granite and slate construction, existing openings and surviving architectural details all contributed to the estate’s character.

This understanding helped identify where repairs were needed, which features should be retained and where sensitive alteration could improve the accommodation.

Refurbishing the Georgian house

Our initial work included upgrading and refurbishing the main Georgian house to improve comfort, layout and functionality while respecting its architectural character.

The work addressed masonry and structural timber repairs, the retention of historic joinery and staircases, and the integration of heating, plumbing and electrical services. Service routes and alterations were considered in relation to the existing fabric and internal arrangement.

Moisture management and thermal improvements also formed part of the technical proposals, including wall-lining systems and insulation.

These measures required coordination with repairs to the traditional construction and the detailing of adjoining elements.

The approach brought the practical requirements of family occupation together with the conservation of the house’s surviving features.

Extending the cottage into the former cartshed

Refurbishment of the cottage included extending its accommodation into the adjoining former cartshed. This offered an opportunity to improve the layout while retaining a distinctive part of the farmstead.

The original granite cartshed posts were preserved, with a bespoke glazed metal screen positioned behind them. Setting the enclosure back allowed the posts and the rhythm of the original bays to remain prominent, retaining a clear indication of the building’s agricultural use.

The glazed screen introduced natural light while enclosing the space for residential occupation. Its relationship with the retained stonework was central to the design, allowing the new accommodation to sit within the existing structure without obscuring its defining features.

The proposals also addressed structural work, insulation, moisture-control detailing and services, with materials and external finishes selected to suit the surrounding buildings.

From four holiday lets to one family home

The substantial granite barn already had permission for conversion into four holiday lets. SMT Associates reviewed the approved scheme and developed an alternative that brought the accommodation together as a single five-bedroom residence.

Through a Section 73 application, we secured amendments to the approved scheme, supported by the necessary heritage and design submissions.

The revised layout reduced the fragmentation associated with four separate units and allowed the barn’s generous internal volume to be appreciated more fully.

An upside-down arrangement placed the principal living spaces on the upper floor, taking advantage of natural light, rural views and the exposed roof structure. Bedrooms were arranged at the lower level.

The design considered the existing openings, granite walls and timber trusses, retaining the features that conveyed the building’s agricultural scale and character. New joinery and alterations were detailed in relation to the existing construction.

Structural repairs, wall and floor-lining systems, insulation and services were coordinated within the technical proposals, bringing the requirements of residential use together with the conservation of the barn.

Heritage evidence supporting the planning case

The listed status of the Georgian house, cottage and principal barn has been central to our approach. Each commission required the proposed changes to be understood in relation to the significance of the affected building and its setting.

Our Heritage Impact Assessments explained that significance and assessed the effects of the works. This informed decisions about layouts, openings, materials, services and the treatment of existing fabric.

Design and Access Statements set out how the proposals responded to the buildings and wider estate, explaining the intended uses, layout, scale, appearance and access arrangements.

Planning-policy assessments provided the supporting justification for the applications, connecting the clients’ objectives with the design and the relevant planning considerations.

Together, these documents supported discussions with planning and conservation officers, providing the evidence behind the drawings and a clear explanation of why the proposed changes were appropriate.

Coordinating technical design and construction requirements

For the initial refurbishment and conversion works, SMT Associates prepared detailed drawings and specifications and submitted and managed Building Regulations applications.

Our role included coordination with structural and mechanical engineers, contractors and specialist consultants, together with consideration of the warranty provider’s requirements.

Technical design addressed structural repairs, moisture management, thermal performance, ventilation, heating, fire safety and the integration of services. These requirements had to be resolved within buildings whose existing construction and retained features shaped the available solutions.

Coordination between the architectural proposals and specialist input helped carry the conservation approach into the detailed construction information.

Continuing under new ownership

Under new ownership of the main barn, our involvement has continued with proposals to convert a further barn into an annexe ancillary to the principal residence.

The design and supporting planning case address how the additional accommodation would serve the main home, maintaining a clear functional relationship between the buildings. The proposals consider the existing structure, its character and the alterations needed to provide comfortable accommodation.

A further application concerns conversion of a former stone cow barn into garage accommodation at ground-floor level, with gym and utility space above.

This requires practical matters, including access, floor levels, structural work, insulation and services, to be considered alongside the retention of the stone envelope and the treatment of existing openings.

For both proposals, heritage assessment, design explanation and planning justification support consideration of the intended uses and their relationship with the wider estate.

An evolving future for the estate

Cosawes Pascoe brings together several different conservation and design challenges: refurbishing a Georgian house, extending a cottage into a granite-posted cartshed, adapting a substantial barn as a single residence and developing proposals for supporting accommodation.

The completed works have improved the buildings’ usefulness while retaining features that connect them to their domestic and agricultural history. The later commissions continue that process as ownership and occupation needs evolve.

Across these connected projects, SMT Associates has brought research, building knowledge, design and technical coordination together to give historic buildings practical futures while preserving the character of the estate.

Related services: Planning & Heritage · Improving Inherited Schemes

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