Window condition surveys
On-site inspections for listed and period properties, from a single house to an estate of several hundred windows.
Quoted in writingIndependent reports Listed and period buildings
LONDON · UK-WIDE
Independent window condition reports for listed and period buildings across the UK
Independent reports on listed and period windows, across the UK.
Heritage Window Consultants is an independent window consultancy providing window condition reports, heritage surveys and planning-ready advice for listed buildings and properties in conservation areas across the UK. We are heritage window specialists, combining 40+ years’ heritage joinery experience with clear, practical advice for homeowners, architects, contractors and property professionals.
The practice
What we do
We specialise in the assessment of period and listed windows, offering both digital consultations and in-person surveys across the UK from our London base. Whether you are navigating planning restrictions, undertaking restoration work or deciding whether your windows can be saved, we provide honest, practical advice rooted in real-world experience.
Digital window survey
A written assessment from your photographs or video within 72 hours. The right first step for early-stage questions or smaller properties.
Within 72 hoursDrawings and consent support
Measured drawings, glazing sections and window heritage statements for a listed building consent or planning application.
Quoted in writingConservation area guidance
Advice tailored to your property. Understand what is allowed, what needs permission, and how to stay compliant.
Desktop review
We set out to keep as much of a building’s original fabric as we can, and where something can be restored, we will always recommend that before anything new.
The report
What is a window condition report?
A window condition report is an independent, photographed record of every window, door or shutter you ask us to look at: what is original, what has been altered, what condition it is in and whether it should be repaired or replaced. It is what most of our clients come to us for.
Each opening is graded for urgency, so you know what to deal with first, and given a clear repair or replacement recommendation with the reasons set out. The report covers sash and casement windows, timber doors and internal shutters, and is used for listed building consent applications, planning permission, tendering and planned maintenance.
The report is backed by photographs and ready for submission to a planning authority. It is written to be used by homeowners, architects, contractors and conservation officers alike, so everyone involved is working from the same information.
The group
Independent advice, backed by 40 years of heritage joinery
Heritage Window Consultants Ltd is part of The Barnsbury Group, a family-run heritage joinery business founded in 1980. That is where our knowledge comes from. For over four decades the group has designed, restored and manufactured traditional timber windows and doors for historic properties, and that experience is what allows us to tell you what can be restored, what should be replaced, and what matters for planning.
The consultancy is run independently of the group’s joinery businesses. You pay for the survey and the report. Most clients take it to their own architect or contractor. If you would like a quote for the work we have recommended, we can arrange one through the right business in the group, but only if you ask us to. Either way, our advice does not depend on what happens next.
Selected instructions
Recent projects
University building
Listed gallery building
Private residence
Listed hostel building
Private gated estate
Public house
The report was clear, practical, and guided our builder. No upselling, just useful advice.
Our clients
Who we work with
Homeowners
Restoring or renovating a Grade II listed home or a property in a conservation area, or told by a builder that the sash windows need replacing, and would like a second opinion from someone with nothing to gain from the answer.
Architects and designers
Preparing planning applications and needing independent window evidence, drawings and reports that conservation officers will accept.
Construction and joinery firms
Working on a project where the timber windows and doors need specialist assessment before they can be priced and built.
Estate agents, developers and property managers
Managing historic sites or large estates and needing every window on record before works are scoped or consulted on.
Buying a period property?
If you are considering a listed house or one in a conservation area, send us photographs and we will give you an early view of what you could and could not do with the windows before you commit.
Listed and period buildings · across the UK
From a single house to an estate of several hundred openings.
Evidence
Trusted by architects, conservation officers and homeowners
With over four decades of hands-on experience, we support architects, planners, contractors and homeowners with reliable, specialist advice on historic and listed windows. Every report is bespoke, referencing the specific building, its materials and the regulations that apply. No templates, no guesswork.
Next step
Get in touch
Tell us the address, whether the property is listed, roughly how many windows, and what you are trying to decide. We reply within one working day with the right survey and a fee in writing.
- Practice
- Heritage Window Consultants Ltd
- Address
- London N1
- Enquiries
- 020 7164 6305