SIP Panel Extensions
Perth.
SIP panel extensions use structural insulated panels to create strong, energy-efficient building structures. Modular Home Extensions designs and builds SIP panel extensions across Perth — combining architectural flexibility with modern insulation performance and traditional concrete foundations.
What is a SIP
panel extension?
A SIP (Structural Insulated Panel) extension uses factory-manufactured panels that combine structural strength and high-performance insulation in a single component. Each panel consists of a rigid insulation core bonded between two structural facing boards — creating a wall or roof element that is simultaneously load-bearing and thermally efficient.
Because the structure and insulation are integrated, SIP extensions eliminate the thermal bridging found in traditional construction — resulting in a warmer, more energy-efficient space that performs consistently throughout the year.
- Structure and insulation in a single factory-made panel
- Eliminates thermal bridging found in traditional construction
- Manufactured off-site to precise tolerances
- Fast on-site assembly — panels arrive ready to install
- 10-year structural guarantee as standard
How a SIP panel
is constructed.
Each SIP panel is a composite component — three distinct layers that work together to deliver structural performance and thermal efficiency in a single, factory-manufactured unit.
Structural facing board
The outer layer is a structural board — typically oriented strand board (OSB) — that provides the rigidity and load-bearing capacity of the panel. It forms the structural skin of the extension wall or roof element.
High-performance insulation core
The insulation core — expanded polystyrene (EPS) or polyurethane foam — is bonded directly to both facing boards under pressure. This continuous core eliminates the air gaps and thermal bridges that occur in traditional stud-and-insulation construction, dramatically improving thermal performance.
Internal structural board
The inner facing board mirrors the outer layer — providing the structural integrity of the panel from the inside, a continuous surface for internal finishes, and a substrate for service routes routed within the panel.
A warmer extension.
Lower running costs.
Structural insulated panels contain high-performance insulation cores that significantly reduce heat loss — creating a comfortable living environment throughout the year and helping keep energy bills lower.
U-Value W/m²K
Meets and exceeds Scottish Building Regulation thermal performance requirements
Thermal bridging
Continuous insulation core eliminates the cold spots found in traditional stud construction
Airtightness
Factory-bonded construction reduces air leakage at wall junctions compared to site-built alternatives
Structural guarantee
Full structural guarantee as standard on every SIP panel extension we install
Built for the
Scottish climate.
Perth sits in a climatic transition zone — colder and drier than the west coast, but with sharp winter frosts and occasional heavy snowfall that put real demands on insulation and airtightness. SIP panels perform reliably across this temperature range: the factory-bonded insulation core delivers consistent thermal performance regardless of seasonal conditions.
SIP panels are particularly well-suited to the Scottish climate precisely because the insulation is continuous and factory-bonded, not dependent on site workmanship. The thermal performance you get is the thermal performance the system was designed to deliver — every time.
- Exceeds Scottish Building Standard thermal requirements
- Continuous insulation — no cold bridges at studs or noggins
- Reduced heat loss through walls and roof
- Warmer rooms, lower heating costs year-round
Architect designed SIP extensions.
Open plan. Modern. Yours.
Perth's housing ranges from Victorian stone villas and Edwardian terraces in the city centre to spacious modern detached homes in Scone, Bridge of Earn and the surrounding villages. Our architects design SIP extensions that respect the character of the existing property while delivering the open plan, well-lit living spaces that modern homeowners are looking for.
Every project is designed by our in-house team — from the first free consultation through to planning permission, building warrant submission and completion certificate. No third-party architect fees. No handoffs between separate professionals.
- Open plan kitchens, dining and living extensions
- Large glazed panels, bifolds and sliding doors
- Flat and pitched roof configurations
- Planning permission and building warrant managed for you
- One team from first sketch to final sign-off
Traditional foundations
for every SIP build.
All SIP panel extensions we construct are installed on traditional concrete foundations — not ground screw systems — ensuring structural reliability and full building control approval in line with Scottish Building Standards.
Concrete pad or insulated strip foundations provide the stable, compliant base that a permanent residential extension demands. Our groundworks team installs them efficiently, keeping the overall programme on track without cutting corners on what goes beneath the ground.
- Insulated strip foundations or reinforced concrete bases
- Fully compliant with Scottish Building Standards
- Building control approved on every project
- No ground screw or alternative foundation methods
Why choose a SIP
panel extension?
SIP extensions combine structural performance, thermal efficiency and fast installation in a single system — with full architect design and no compromise on layout or appearance.
Superior thermal performance
The continuous insulation core of a SIP panel eliminates thermal bridging — delivering a warmer, more consistent internal environment and lower heating costs compared to traditional stud-and-insulation construction.
Factory precision
Panels are manufactured off-site to exact tolerances in controlled conditions, not cut and fitted on site. The result is consistent quality that doesn't vary with weather, workmanship or site conditions.
Fast installation
SIP panels arrive on site ready to assemble, significantly reducing the on-site construction programme compared to traditional build — meaning less disruption to your household and a faster route to enjoying your new space.
Design flexibility
The SIP system supports open plan layouts, large areas of glazing, vaulted ceilings and modern roof forms. Our architects design around your brief — the system doesn't constrain what's achievable.
Structural reliability
SIP panels are load-bearing by design. The system carries independent structural certification and a 10-year guarantee — providing long-term confidence in the structural performance of your extension.
Pre-approved for building control
The system is pre-approved for Building Regulation compliance, making the building warrant process fast and straightforward. Our team manages the full submission — you don't have to navigate it yourself.
SIP extensions across
Perth & beyond.
We design and build SIP panel extensions across Perth and the surrounding Perthshire areas. Our local experience means we understand the property styles, planning requirements and Perth & Kinross council expectations of each neighbourhood.
SIP panel extensions in Perth
— answered.
Do SIP panel extensions need planning permission in Perth?
Planning requirements depend on the design and scale of the extension. Many qualify under Permitted Development Rights and need no formal application. Our architectural team can advise on permitted development, Perth & Kinross planning policies and manage building warrant submissions where required.
Are SIP extensions built on concrete foundations?
Yes. All SIP extensions we build are installed on traditional concrete foundations — insulated strip foundations or reinforced concrete bases — to fully satisfy Scottish building control requirements. We do not use ground screw systems for permanent residential extensions.
Are SIP extensions more energy efficient than traditional extensions?
Yes. The continuous insulation core of a SIP panel eliminates the thermal bridging found in traditional stud-and-insulation construction — resulting in lower heat loss, a warmer internal environment and reduced heating costs. SIP extensions meet and typically exceed Scottish Building Regulation thermal requirements.
Who designs a SIP panel extension?
Every project is designed by our in-house architectural team. Modular Home Extensions is part of the OBG Group, providing integrated architectural design and construction expertise under one roof — with no third-party architect fees.