Sash & Casement Window Replacement
Like-for-like timber sash and casement windows manufactured to exactly replicate original period details.
Like-for-Like Timber Windows
When sash windows have deteriorated beyond economical repair, or where inappropriate replacements have been installed previously, we manufacture new timber sash windows to match original specifications precisely. Every element is replicated, from the exact profile shapes to the moulding details, ensuring the new windows are indistinguishable from period originals.
Our like-for-like replacement service is specifically designed to satisfy conservation officer requirements and achieve listed building consent. We work closely with planning departments throughout Belfast and Northern Ireland to ensure our specifications meet all heritage requirements.
What's Included
- Detailed survey and measurement of existing or historic windows
- Custom cutter profile creation to match original mouldings
- Selection of appropriate heritage-grade timber
- Traditional joinery manufacture with mortise and tenon joints
- Period-appropriate glazing bar configurations
- Authentic horn details where required
- Brass sealed ball bearing pulleys and lead sash weights
- Concealed draught proofing as standard
- Professional installation with minimal disruption
- Full decoration service available
Heritage Timber Selection
We use a range of high-quality timbers appropriate for heritage window manufacture. Accoya (acetylated wood) offers exceptional durability with a 50-year guarantee against rot and decay. We also work with Sapele, European Oak and engineered softwood, selecting the most appropriate material for your property and budget.
Conservation Approved
Our replacement windows are specifically designed to achieve approval from conservation officers and satisfy listed building consent requirements. We understand that exact replication of historic features is essential in these contexts, and our manufacturing process is geared entirely towards this goal.
When to Replace
Replacement becomes the most practical option when:
- Timber decay has progressed beyond economical repair
- Previous inappropriate replacements need correcting
- Windows have been removed and need reinstating
- Extensions or alterations require matching windows
- Original windows were lost to fire or other damage
Glazing Options
Our replacement windows can incorporate traditional single glazing, slimline double glazing, or FINEO vacuum glazing depending on planning requirements and your performance objectives. We advise on the most appropriate option for your specific circumstances.
Common Questions
Like-for-like sash window replacement involves manufacturing new timber sash windows that exactly replicate your original windows in every detail. This includes matching the precise profile shapes, moulding designs, glazing bar configurations, horn styles and timber species. The new windows are indistinguishable from the originals and are specifically designed to satisfy conservation officer requirements for listed buildings and properties in conservation areas.
Sash window replacement costs in Belfast vary depending on size, complexity and specification. A standard two-over-two sash window typically costs between GBP 1,200 and GBP 2,000 including installation. More complex period windows with multiple glazing bars, horns, or specialist glazing may cost more. We provide detailed quotations following our free survey, breaking down all costs transparently with no hidden charges.
Yes, we can match original profiles precisely. We take detailed measurements and create custom cutter profiles to replicate the exact moulding shapes of your existing windows. This includes matching the stiles, rails, glazing bars, parting beads and staff beads. For listed buildings, this exact replication is essential to achieve conservation officer approval.
We use a range of high-quality timbers for replacement sash windows. Accoya (acetylated wood) offers exceptional durability and dimensional stability with a 50-year guarantee. We also work with Sapele, European Oak, and engineered softwood depending on your requirements and budget. All timber is sustainably sourced and kiln-dried to appropriate moisture content for window manufacture.
If your property is listed or in a conservation area, you will need listed building consent or planning permission for window replacement. Our like-for-like replacement service is specifically designed to meet these requirements, matching original specifications exactly. We have extensive experience working with conservation officers and can assist with your application if required.
Manufacturing bespoke replacement sash windows typically takes 4-6 weeks following your order. Installation usually takes 1 day per window, including removing the old window, fitting the new frame and sashes, and ensuring proper operation. For larger projects, we work systematically through the property to minimise disruption while maintaining building security.
Book Your Survey
Book a free, no-obligation survey to assess your sash window replacement requirements. We serve Belfast and all of Northern Ireland.
Request Free Survey