SY Design Studio provides professional architectural design, planning drawing and Building Regulations services in Spelthorne. Led by Architectural Technologist Salman Yousaf, we help homeowners and landlords with extensions, loft conversions, measured surveys, planning applications and detailed technical drawing packages.
Spelthorne sits along the Thames in Surrey, covering Staines-upon-Thames, Sunbury-on-Thames and Shepperton, with a mix of suburban semis, detached houses and riverside properties. SY Design Studio provides architectural design and technical drawing services to homeowners and landlords across the borough, working on family houses and riverside plots.
Common projects in Spelthorne include rear and side extensions, loft conversions and internal alterations. Given the borough's Thames-side location, some properties near the river in areas such as Laleham, Shepperton and Halliford may be affected by flood risk, which can influence design and construction detailing. Other parts of the borough follow more straightforward suburban planning considerations.
Every property and planning history is different, so we assess each site individually. We cover Staines-upon-Thames, Ashford, Sunbury-on-Thames, Shepperton, Stanwell, Laleham, Halliford, Charlton, Littleton and Upper Halliford, and the surrounding area.
People searching online for architects near me or architectural services near me in Spelthorne are often looking for support with planning drawings, Building Regulations packages, extensions or loft conversions. SY Design Studio provides these services from initial assessment through to technical drawings, working with clients across Staines-upon-Thames, Sunbury and Shepperton.
Led by Architectural Technologist Salman Yousaf, the studio offers clear, practical and buildable design solutions for extensions, loft conversions and internal alterations, including riverside properties where flood risk may be a consideration. We are happy to discuss your project before you commit to anything.

Design and planning drawing packages for householder applications, full planning applications and planning feasibility advice.
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Detailed technical drawings and construction information to support Building Control approval and construction.
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Rear, side, wraparound and two-storey extension designs that improve space, daylight and everyday use.
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Dormer, hip-to-gable, rooflight and mansard design support, subject to the property and relevant planning controls.
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Accurate measured surveys and existing-property drawings to support design, planning and technical work.
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Prior approval applications for larger single-storey rear extensions and other qualifying permitted development.
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Certificates confirming that existing or proposed works are lawful, for permitted development or established use.
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High-quality external and internal visuals to help clients understand a proposed design before construction.
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Conversion of houses into flats or maisonettes, including layout design and Building Regulations packages.
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Internal structural alterations coordinated with a suitably qualified structural engineer where required.
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Shop alterations, change-of-use applications, subdivisions and Building Regulations packages for commercial premises.
Learn MorePlanning applications in Spelthorne are assessed by the Spelthorne Borough Council. Depending on the property and proposal, a project may require householder planning permission, permitted development, prior approval and a lawful development certificate.
The correct route depends on the property type, site location, proposed dimensions, planning history, previous planning conditions, conservation-area or listed-building status, permitted development restrictions, Article 4 Directions, use class and local planning policy. We do not guarantee approval and have no special relationship with any local planning authority — every application is assessed on its own facts.
Some properties near the Thames in areas such as Laleham, Shepperton and Halliford may be affected by flood risk, which can influence design and construction detailing and may require additional assessment. Other parts of the borough follow more straightforward suburban planning considerations. These factors must be checked for the individual address.
Rear and side extensions and loft conversions are common across Spelthorne's suburban housing, with additional design consideration needed for riverside properties affected by flood risk.
Planning permission and Building Regulations are separate processes. Gaining planning permission, or confirming permitted development, does not remove the need for a compliant technical drawing package before and during construction. Depending on the project, this may include:
Not every project needs every item — the exact package depends on the project, and we confirm the scope once the design is settled.
We follow the same clear process for every Spelthorne project, from initial consultation through to construction support.
Discuss the property, proposed work, required services and likely next steps.
Review the property type, planning history and potential planning constraints.
Carry out a measured survey and prepare accurate existing drawings where included.
Develop the proposed plans and external design with the client.
Prepare the required drawings and supporting documents and submit the application where included within the agreed service.
Prepare the technical drawing package and coordinate structural and specialist information where required.
Provide clarifications, revisions or further design services where included or separately agreed.
Alongside Spelthorne itself, we cover areas across and around the borough, including Ashford, Sunbury-on-Thames, Shepperton, Stanwell, Laleham, Halliford, Charlton, Littleton and Upper Halliford. See our full areas covered guide for other locations.