Windows & Doors Sealing Services
At GP Contracts, we understand that properly sealed windows and doors are essential for energy efficiency, weather protection, and long-term structural integrity. Gaps, cracks, or deteriorating sealant around frames can lead to draughts, water ingress, heat loss, and costly damage over time.
Professional window and door sealing is a critical part of both new installations and property maintenance. Whether you are upgrading glazing, completing a renovation, or addressing visible wear and tear, high-quality sealing ensures your property remains protected, efficient, and visually finished to a professional standard.
What Is Window & Door Sealing?
Window and door sealing involves applying specialist sealants around frames, joints, and perimeter gaps to create a durable, weather-resistant barrier. This process prevents water, air, and debris from penetrating into the building envelope.
Sealing is required in areas such as:
- Around external window frames
- Around external door frames
- Internal window and door perimeters
- Between frames and brickwork
- Expansion and movement joints
- Thresholds and cills
- Patio and bi-fold door frames
Proper sealing ensures flexibility to accommodate natural building movement while maintaining an airtight and watertight finish.
Why Professional Sealing Is Essential
Prevents Water Ingress
The UK climate brings frequent rain and fluctuating temperatures. Poorly sealed windows and doors allow water to penetrate behind frames, potentially causing:
- Damp patches on internal walls
- Rotting timber
- Damaged plasterwork
- Mould growth
- Compromised insulation
- Structural deterioration
External-grade sealant provides a protective barrier that prevents moisture from entering vulnerable areas.
Improves Energy Efficiency
Small gaps around windows and doors can result in significant heat loss. Draughts reduce comfort and increase heating costs, especially during colder months.
Professional sealing enhances insulation by eliminating air leaks, helping to:
- Reduce energy bills
- Improve indoor comfort
- Support better thermal performance
- Lower your property’s carbon footprint
Reduces Noise Penetration
Sealed frames also help minimise external noise entering the property. This is particularly beneficial in busy residential areas or commercial environments near roads and high-traffic zones.
Enhances Appearance
Cracked or uneven sealant around windows and doors can make a property look poorly maintained. Clean, precise sealant lines provide a sharp, finished appearance that complements new installations and refurbishments.
External Window Frames
The junction between window frames and brickwork is one of the most vulnerable points for water ingress. Over time, sealant can shrink, crack, or peel away, leaving gaps exposed to the elements.
Professional resealing ensures long-term weather protection.
External Doors and Thresholds
Front doors, patio doors, and rear access doors are subject to constant opening and closing, as well as direct exposure to weather. Flexible, high-performance sealant is essential to maintain a secure seal without restricting movement.
Internal Finishing
Internal sealing between frames and plasterwork ensures a neat finish and improves air tightness. It also helps prevent minor draughts and improves overall aesthetics.
Bi-Fold and Sliding Doors
Large glazed doors require careful sealing due to movement and exposure. Proper application prevents water from tracking into floor junctions and internal finishes.
Signs Your Windows & Doors Need Resealing
Sealant degrades over time due to UV exposure, temperature changes, and building movement. You may require resealing if you notice:
- Visible cracks in the sealant
- Peeling or separation from the frame
- Draughts near windows or doors
- Water leaks during rainfall
- Condensation forming around frame edges
- Mould or damp patches near openings
Addressing these signs early prevents more serious and costly repairs later.
Our Professional Sealing Process
At GP Contracts, we follow a detailed approach to ensure reliable and long-lasting results.
Inspection and Assessment
We evaluate the condition of existing sealant and surrounding materials, identifying any signs of damage, movement, or moisture penetration.
Removal of Old Sealant
All deteriorated sealant is carefully removed without damaging frames or brickwork. Complete removal is essential for proper adhesion of new material.
Surface Preparation
Surfaces are cleaned and dried thoroughly to remove dust, debris, and residue. Proper preparation ensures strong bonding and long-term durability.
Application of High-Performance Sealant
We apply premium external-grade silicone or hybrid sealants designed to withstand weather exposure and structural movement. Lines are finished neatly for a clean, professional appearance.
Final Checks and Finishing
We inspect the completed work to ensure full coverage and optimal sealing performance.
Domestic Window & Door Sealing Services
For homeowners, professional sealing may be required after:
- Installing new windows or doors
- Replacing glazing units
- Property renovations
- Identifying draughts or leaks
- Preparing a home for sale
- Routine maintenance
Even minor gaps can significantly impact comfort and efficiency. Professional resealing ensures your home remains protected year-round.
Commercial Window & Door Sealing
Commercial properties often experience greater wear due to heavy use and larger glazing systems. We provide sealing services for:
- Office buildings
- Retail units
- Schools and educational facilities
- Healthcare premises
- Industrial units
- Rental portfolios
Our team works efficiently and safely to minimise disruption while maintaining high standards of workmanship.
The Risks of DIY Sealing
While sealant products are readily available, incorrect application can lead to:
- Incomplete sealing
- Poor adhesion
- Uneven finishes
- Gaps that allow water penetration
- Reduced lifespan of materials
External sealing requires the correct product choice, surface preparation, and professional tooling to ensure durability under changing weather conditions.
Choosing the Right Sealant
Different environments require different sealing solutions. Factors we consider include:
- External weather exposure
- UV resistance
- Frame material (uPVC, aluminium, timber)
- Building movement
- Colour matching requirements
Using the correct sealant ensures flexibility, adhesion, and long-term performance.
How Long Does Window & Door Sealant Last?
High-quality external sealant typically lasts between 10 and 20 years, depending on exposure and environmental conditions. However, regular inspection is recommended to identify early signs of wear.
Proactive maintenance can prevent damage to surrounding brickwork and internal finishes.
Window & Door Sealing as Part of Renovation Projects
Sealing is often one of the final stages of window and door installation but plays a critical role in overall performance. It works in conjunction with:
- Frame installation
- Insulation works
- Brickwork or render finishing
- Internal plastering
- Flooring installation
Attention to detail at this stage ensures the installation performs as intended for years to come.
Why Choose GP Contracts for Window & Door Sealing?
At GP Contracts, we combine experience, precision, and reliability across residential and commercial projects. Our clients trust us because we focus on:
- High-quality workmanship
- Premium sealing materials
- Clean, professional finishes
- Weather-resistant solutions
- Long-lasting protection
Whether you require resealing for maintenance or professional finishing following a new installation, we deliver dependable results tailored to your property’s needs.
Protect Your Property with Professional Sealing
Windows and doors are essential structural elements that directly impact comfort, energy efficiency, and weather protection. Proper sealing prevents draughts, leaks, and long-term structural issues while enhancing the overall appearance of your property.
If you have noticed cracks, leaks, or draughts — or you are completing a renovation project — professional window and door sealing ensures your property remains secure, efficient, and protected against the elements.
Contact GP Contracts today to discuss your window and door sealing requirements and safeguard your property for the future.
See who we work with
Looking for Expert Mastic Sealant Contractors?
When it comes to professional mastic sealing and all types of sealant application, GP Contracts is your reliable choice. Reach out to us today to experience the GP Contracts difference firsthand. First class application and customer satisfaction are our top priorities.