HEAG317 Drone Survey for Listed Buildings - Non-Contact Heritage Capture

Historic England's HEAG317 — Aerial Investigation and Mapping — provides guidance for the use of aerial platforms in the investigation and documentation of historic buildings, scheduled monuments, and registered parks and gardens. It is the established reference for aerial survey methodology in the historic environment sector.

For conservation architects, historic environment consultants, and local planning authority conservation officers commissioning aerial survey work, HEAG317 sets the standard for what a professionally conducted aerial record looks like. Non-intrusive. Systematic. Documented. Repeatable.

This article explains how Airsuv's ARC capture system delivers HEAG317-aligned aerial documentation for listed buildings and heritage structures.

What HEAG317 Requires

HEAG317 guidance establishes the principles that should govern aerial survey in the historic environment. The core requirements relevant to drone-based condition survey are systematic coverage, non-intervention, and structured documentation.

Systematic Coverage

An aerial condition record must cover the full extent of the asset — all elevations, roof surfaces, and architectural features relevant to the condition assessment. Partial coverage is not a condition record. The survey must be planned to deliver complete documentation of the historic fabric, not selective capture of accessible or visually prominent areas.

Non-Intervention

No part of the survey equipment may make physical contact with the historic fabric at any stage. This is a fundamental requirement of non-intrusive investigation in the historic environment. For drone survey, it means maintaining safe clearance from all historic surfaces throughout the mission — not as an operational constraint but as a professional standard.

Structured Documentation

The survey output must be a structured, organised record — not a collection of images. Coverage should be documented by elevation, feature, and condition. The record must be usable as a baseline for future inspection and as supporting evidence for conservation, planning, and maintenance decisions.

How Airsuv Applies HEAG317 Through ARC

ARC-1 through ARC-3 form the capture basis for Airsuv's HEAG317-aligned heritage documentation. The non-contact requirement is built into every layer. Safe clearance from all historic surfaces is confirmed per structure at the briefing stage and maintained throughout the mission.

• ARC-1  —  Full building overview from a minimum of four elevations. Complete asset geometry, setting, and environmental context. No edge clipping — the complete structure is present in every overview frame.

• ARC-2  —  100% elevation and roof surface coverage at consistent distance and overlap. Non-contact maintained throughout. No part of the drone or its equipment approaches the historic fabric.

• ARC-3  —  Feature capture of all architectural detail requiring explanation in the condition record — fixtures, junctions, material interfaces, leadwork, flaunching, flashings, and all surface conditions of note. Front, side, and context views per feature.

• ARC-4  —  Close-range detail of specific surface conditions identified during ARC-2 and ARC-3. Drone stationary at point of capture. Zero motion blur tolerance.

• ARC-5  —  Site access, ground conditions, and environmental context. Non-intervention confirmed — no markers, no ground targets placed on or near listed fabric.

SfM Photogrammetric Model

Where a three-dimensional record is required — for scheduled monument documentation, complex architectural geometry, or as a baseline for monitoring structural movement — Airsuv delivers a Structure from Motion (SfM) photogrammetric model (PLY format) processed from the ARC-2 and ARC-3 capture dataset.

The SfM model is produced using DJI Terra. It provides a measured, dimensioned record of the building fabric that can be used for condition analysis, conservation planning, and as a reference dataset for future surveys. The photogrammetric model is generated from the same dataset as the condition record — no additional flight is required.

What the Client Receives

Every Airsuv HEAG317-aligned heritage survey delivers: RGB condition record organised by elevation with consistent labelling, orthorectified elevation imagery aligned to HEAG317 documentation principles, SfM photogrammetric model (PLY) where scoped, radiometric thermal dataset where deployed, and all data GPS-referenced. Standard delivery within 24 hours for single-structure captures.

Structures Covered

Airsuv covers Grade I, Grade II*, and Grade II listed buildings, scheduled ancient monuments, and Historic England registered parks and gardens. Safe clearance distance is confirmed per structure at the briefing stage — it is not a fixed parameter but a site-specific operational decision made in advance of every heritage mission.

Airsuv also has direct operational experience of heritage building aerial survey — the methodology described in this article has been applied in practice, not only in planning.

HEAG317-aligned. Non-contact throughout.

ARC-structured condition record delivered within 24 hours.

Heritage building survey enquiries to airsuv.uk/airsuv-quotes or contact@airsuv.uk.