Business Details
Bespoke Glazed Extensions in Hailsham
Hallmark Glazed Extensions embodies a commitment to inspiring designs that evoke positive emotions, creating harmonious home living environments. Our head office in Hailsham, East Sussex, serves clients across Sussex, Hampshire, and the Home Counties. With over 50 years of combined experience, our team of knowledgeable designers, planning coordinators, and installation specialists delivers bespoke glazed extensions, including conservatories, orangeries, and garden rooms. We prioritise seamless project management from concept to completion, offering 3D design visualisations, structural calculations, and planning applications.Our values reflect natural elementsair, space, light, nature, fire, earth, and waterguiding our collaborative approach to enhance client wellbeing through high-specification materials and year-round usable spaces. As members of The Listed Property Owners' Club, we specialise in extensions for period properties, supported by a 10-year warranty on all projects.
Services
Bespoke Orangeries
Luxury Oak Extensions
Conservatories
Garden Rooms
Windows and Doors
Verandas
Louvered Roof Pergolas
Kitchen Extensions
Listed Property Extensions
Highlights and features
- We offer 50+ years of combined experience in glazed extension design and installation
- Our full-service approach covers design, planning, and build without needing an architect
- We provide 3D design visualisations and detailed cost projections for transparency
- Our installers are Assure Competent Person Scheme certified for quality assurance
- We specialise in extensions for listed and period properties with planning expertise
Associations and certifications
- The Listed Property Owners' Club
What people say
Exemplary workmanship
Seamless installations
Stunning transformations
Professional teams
Year-round usability
Services
Bespoke Orangeries
Our bespoke orangeries create stunning focal points for homes, blending natural light with architectural elegance. Using premium materials like hardwood, aluminium, and uPVC, we design extensions that enhance kitchen spaces or create open-plan living areas. Each project incorporates high-specification glazing for year-round usability, with seamless integration into both modern and period properties.
Luxury Oak Extensions
Luxury oak extensions add timeless elegance to any property, creating a natural connection between indoor and outdoor spaces. We use sustainably sourced oak to craft extensions that improve home wellbeing while maintaining thermal efficiency. Our designs suit both contemporary and traditional homes, featuring precision joinery and weather-resistant finishes for lasting durability.
Conservatory Projects
Our conservatories combine traditional aesthetics with modern performance, providing light-filled spaces usable in all seasons. Available in uPVC, aluminium, or hardwood frames, each conservatory features solar-controlled glazing and optional ventilation systems. We specialise in designs that complement property architecture while maximising energy efficiency and low-maintenance functionality.
Garden Rooms
Garden rooms extend living spaces into the outdoors, offering versatile areas for work, relaxation, or entertainment. Constructed with thermally efficient materials and quick-install frameworks, these spaces feature insulated floors, electrical integration, and bioclimatic roof options. Our designs prioritise low maintenance while ensuring seamless garden integration and year-round usability.
Listed Property Extensions
Specialist extensions for listed buildings maintain historical integrity while introducing modern living solutions. We navigate complex planning requirements and use sympathetic materials to create discreet yet functional additions. Our expertise includes replica timber profiles, traditional joinery techniques, and compliance with heritage conservation standards for protected structures.
People
Marcus FitzGerald
Managing Director
Marcus leads Hallmark Glazed Extensions with a vision to create harmonious living spaces that connect homes with nature. With extensive industry experience, he oversees design innovation and project strategy, ensuring every extension reflects client aspirations while maintaining structural integrity and aesthetic coherence.
Questions
Is planning permission required for glazed extensions?
Most projects don't require planning permission, though listed properties or homes in protected areas may need approval. We handle all applications on your behalf.
Will my extension be usable all year?
Yes, our solar-controlled glass provides 86% heat deflection in summer and maximum retention in winter, ensuring year-round comfort with optional roof vents.
What is the cost range for projects?
Projects typically range from £25,000 to £80,000, depending on size, materials, and design complexity, including all regulatory fees and installations.
Do you work on listed properties?
Yes, we specialise in glazed extensions for listed buildings, maintaining period authenticity while incorporating modern energy-efficient solutions.
What warranty do you provide?
All projects include a comprehensive 10-year warranty covering design, materials, and installation workmanship.
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