Wed Apr 29
Specifying sash windows for a listed building, a project in a conservation area or a development of period properties is rarely straightforward. Between planning constraints, building regulations and client expectations around thermal efficiency, architects and specifiers need a technical partner who understands the detail.
TRC Consult is the specialist advisory service from TRC Contracts, created to support architects, specifiers, main contractors and developers with expert guidance on timber sash windows from the earliest design stages through to installation.
With decades of experience across heritage and high-end residential projects, our team offers the detailed information needed to make the right choice with confidence.
What is TRC Consult?
TRC Consult is a free, collaborative advisory service that gives project teams easy access to our technical expertise on timber windows. Whether you’re drafting an NBS specification, preparing a planning submission or navigating the latest guidelines on energy efficiency in heritage buildings, our consultants are on hand to help.
We work alongside your team rather than selling to it. The goal is to help you specify with accuracy the first time round, avoiding costly revisions later in the programme.
Why specialist sash window advice matters
The UK has roughly 500,000 listed buildings according to Historic England, and many millions more traditional period properties fall within conservation areas. Each carries its own specification challenges. A sash window suitable for a Georgian townhouse in Bath will differ substantially from one destined for a Victorian terrace in London.
Recent updates to Part L of the building regulations have tightened requirements around thermal performance, while planning authorities continue to scrutinise any changes to original timber sash windows. Balancing modern performance with the timeless charm of traditional timber sash windows requires experience, not guesswork.
How does TRC Consult help with conservation area projects?
Our consultants review planning constraints, liaise with conservation officers where needed and recommend sash window profiles that match original detailing. We then pair that heritage accuracy with discreet draught-proofing and slim double glazing, giving you superior performance without compromising the character of the building.
How TRC Consult supports your project
Our advisory service covers the full scope of technical, planning and commercial considerations involved in specifying sash windows.
1. Replacement versus refurbishment
One of the most frequent questions we’re asked concerns budget costs for refurbishment compared to replacement. We can outline all the options available, whether that’s complete replacement with bespoke or standard windows, extensive refurbishment including full glazing renewal and bespoke ironmongery, or a basic overhaul with draught-proofing installation.
2. Listed building and Article 4 Direction consent
We provide detailed surveys to help secure listed building consent and to navigate the often complex planning requirements associated with it. Our team advises on which alterations and upgrades are achievable, supported by specifications and drawings tailored to your scheme.
3. Conservation area consent
Depending on the local conservation officer, certain alterations – such as replacing double-glazed units with slim sealed units or fitting replacement sashes with vacuum glazing – may be possible without planning consent. We provide the detailed advice, specifications and drawings needed to progress your application smoothly.
4. Balancing heritage with security
Security is a key consideration on many projects, and achieving PAS 24 compliance can be challenging on heritage schemes. TRC advises on the solutions available to deliver the best possible security performance while respecting planning requirements.
5. NBS and BIM specifications
TRC holds an extensive library of NBS specifications and BIM objects for use at planning stage. Our NBS specifications cover both new windows and refurbishment scenarios, giving you a reliable starting point for any project type.
6. Surveys
We offer three levels of survey to suit your project stage and budget:
- Detailed condition surveys – a site visit covering a full survey, window schedule and photographic schedule
- Basic condition surveys – a site visit and survey using drawings and schedules supplied by the client
- Desktop surveys – general advice without a site visit, based on photos and drawings provided by the client
7. Costs
We provide budget costs for all options at the early stages of a project, followed by accurate fixed quotations once the specification is finalised. This structured approach helps you achieve cost certainty and gives clients peace of mind from concept through to completion.
Working to the high standards your project demands
Every sash window supplied by TRC Contracts is manufactured in the UK to high standards. When you specify through TRC Consult, you know the product delivered on site will match the drawings approved at design stage.
Talk to TRC Consult about your next project
Whether you’re specifying a handful of timber sash windows for a private refurbishment or hundreds for a mixed-use development, our consultants are ready to help. Share your drawings, your planning constraints and your performance targets, and we’ll respond with practical recommendations tailored to the brief.
Visit the TRC Consult page or get in touch with our team directly to book a consultation.
