Executive Summary
The investigation concerned a recently completed rear extension adjoining an established residential boundary.
The instructing owners were concerned that elements of the neighbouring construction extended beyond the original boundary separating the properties.
Stokemont undertook a comprehensive boundary assessment incorporating documentary research, historical analysis, an inspection of the original building fabric and a series of measured comparisons.
The principal findings were as follows:
- The documentary evidence consistently supported a straight boundary alignment extending from the front to the rear of the properties.
- The apparent boundary followed the centreline of the original shared masonry party wall.
- Measurements indicated a marginal projection of the extension’s masonry flank wall beyond the assumed boundary at its closest point.
- The extension gradually diverged away from the boundary towards the rear of the site.
- The roof construction, fascia and associated eaves projected beyond the masonry wall and further into the adjoining property’s airspace.
- The limited masonry projection was considered sufficiently minor that it could reasonably be regarded as de minimis.
The findings provided the instructing owners with a professional assessment of the apparent boundary position, the extent of the identified discrepancies and the considerations relevant to achieving a proportionate resolution.
How Stokemont Helped
Disputes concerning property boundaries frequently arise following building works undertaken close to adjoining land. Even relatively minor discrepancies between an established boundary and newly constructed elements can raise concerns regarding ownership, encroachment and the rights of neighbouring property owners.
Such matters require careful investigation. The position of an existing wall, fence or building does not necessarily establish the legal boundary, and reliance upon a single plan or isolated measurement can lead to incorrect conclusions.
Stokemont was recently instructed to undertake an independent boundary investigation following concerns that a newly constructed residential extension may have extended beyond the boundary separating two adjoining properties.
The investigation required consideration of several sources of evidence, including:
- Historical conveyance plans and ownership documentation.
- HM Land Registry title plans.
- Ordnance Survey mapping and historical records.
- Aerial imagery and planning application drawings.
- Physical features and measurements obtained during the site inspection.
The purpose was to establish a reasoned professional opinion regarding the apparent boundary position and assess whether the completed construction departed from that alignment.
Stokemont’s Objective
The objective of the boundary survey was to establish whether the newly constructed rear extension had been positioned wholly within the neighbouring owner’s land or whether elements of the development extended beyond the apparent boundary.
To address this, Stokemont was instructed to:
- Review the available historical and contemporary boundary documentation.
- Establish the apparent boundary alignment using the original shared party wall as a physical reference.
- Undertake internal and external measurements to assess the position of the completed extension.
- Consider whether the masonry construction extended beyond the assumed boundary.
- Assess the relationship between projecting roof elements and the adjoining property’s airspace.
- Provide an impartial professional opinion supported by the available evidence.
The investigation was intended to establish the apparent boundary position and identify any physical discrepancies. It was not intended to constitute a definitive legal determination of ownership.
Stokemont’s Boundary Surveyor Findings
The investigation commenced with a comprehensive review of the available historical and contemporary documentation.
Historical Conveyance Plans and Land Registry Records
Historic conveyance plans were obtained for both properties. These provided important evidence of the original plot arrangement and consistently illustrated the boundary extending in a straight line from the front to the rear of the properties, aligned with the centreline of the original shared party wall.
The conveyance plans also contained T-markings relating to the relevant boundary features. These were considered in the context of possible maintenance responsibilities, although such markings do not, in isolation, establish legal ownership.
The corresponding HM Land Registry title plans were subsequently examined and were found to support the same general boundary alignment.
The principal documentary findings were:
- Both historical conveyance plans depicted a consistent boundary position.
- The boundary was shown as following the centreline of the original party wall.
- The Land Registry title plans supported the same general alignment.
- No deviation from this alignment was identified within the conveyance or title plans reviewed.
As Land Registry title plans ordinarily identify boundaries under the general boundaries principle, they were not treated as sufficiently precise to establish the exact boundary position through scaled measurement alone.
Instead, they were considered alongside the original conveyance documentation and other available evidence.
Historical Mapping and Aerial Imagery
Further research was undertaken using Ordnance Survey mapping and historical maps.
These records provided additional support for a consistent boundary alignment, with no documentary indication that the boundary historically deviated from the centreline of the original shared party wall.
Aerial imagery was also reviewed to consider the physical relationship between the properties.
Although useful as supporting evidence, aerial photographs can be subject to limitations associated with image resolution, perspective and alignment. They were therefore not relied upon as a definitive means of determining the boundary.
Overall, the mapping and aerial evidence supported the findings reached through the conveyance plans and Land Registry documentation.
Planning Application Documentation
The investigation then considered the planning application documentation associated with the neighbouring development.
Both the existing and proposed architectural drawings consistently represented the boundary as following the centreline of the shared party wall.
The proposed extension was illustrated as being constructed up to the boundary rather than across it.
The review identified that:
- The existing plans showed the boundary following the original party wall centreline.
- The proposed drawings adopted the same boundary alignment.
- The extension was illustrated as being constructed up to the boundary.
- No intended encroachment beyond the boundary was identified within the submitted drawings.
While planning drawings do not independently determine legal ownership, their consistency with the historical and registered title documentation provided further support for the apparent boundary alignment.
Site Inspection and Measured Assessment
Having established the documentary position, our surveyor proceeded to examine the physical construction.
The properties formed part of an original pair of semi-detached dwellings sharing a central masonry party wall.
An inspection of the accessible roof space identified exposed sections of the original solid brick party wall. These were measured to establish the approximate wall thickness and corresponding centreline.
The key measurements were:
- Original party wall thickness: approximately 220–230 mm.
- Calculated party wall centreline: approximately 110–115 mm from either face.
- Apparent projection of the extension’s masonry wall at its closest point: approximately 15–20 mm.
- Clearance between the assumed boundary and the extension towards the rear: approximately 300 mm.
The original party wall provided an important physical reference point from which the assumed boundary position could be related to fixed features elsewhere within the building.
Using an existing internal opening as a reference point, our surveyor obtained measurements to the internal face of the party wall and calculated the corresponding centreline position.
Comparative external measurements were then undertaken from the same reference point towards the flank wall of the neighbouring extension.
The results indicated that the masonry flank wall extended marginally beyond the assumed boundary at its closest point.
However, measurements taken at intervals along the extension established that the wall gradually diverged away from the boundary towards the rear of the garden.
This indicated that the extension had been constructed at a slight angle, with the potential masonry encroachment confined to its closest point to the original building.
In our surveyor’s professional opinion, the measured projection of the masonry was extremely limited and could reasonably be regarded as de minimis.
Roof and Fascia Encroachment
Although the apparent masonry encroachment was relatively minor, the inspection identified a further distinction between the wall construction and the associated roof elements.
The roof covering, fascia and eaves projected beyond the external face of the masonry flank wall.
Consequently, these elements appeared to extend further into the adjoining property’s airspace than the masonry construction itself.
The findings demonstrated that:
- The masonry wall was not the outermost element of the completed extension.
- The roof and fascia projected beyond the wall face.
- The apparent airspace encroachment was therefore greater than the measured masonry projection.
- A boundary investigation should consider the complete construction, including roof overhangs and other projecting architectural elements.
This was an important aspect of the investigation, illustrating why assessing potential boundary encroachment requires more than simply measuring the position of external walls.
Stokemont’s Surveyor’s Professional Opinion
When the documentary evidence and physical measurements were considered collectively, our surveyor concluded that the available evidence strongly supported a boundary following the centreline of the original shared party wall.
On the balance of probabilities, the investigation established that:
- The original boundary alignment was consistently supported by the available documentary evidence.
- The extension’s masonry flank wall appeared to extend marginally beyond the assumed boundary at its closest point.
- The extension gradually moved away from the boundary towards the rear.
- The roof and fascia projected further beyond the masonry wall into the adjoining property’s airspace.
These findings were presented as a professional surveying opinion based upon the available evidence, rather than a legally binding determination of the precise boundary.
Stokemont’s Advice
Following completion of the investigation, Stokemont recommended that the Boundary Surveying Report be shared with the neighbouring property owner to facilitate constructive discussions regarding the findings.
Although the measured masonry encroachment was limited, the assessment identified a distinction between the external wall and the projecting roof elements that warranted consideration by the respective owners.
The principal recommendations were:
- Share the Boundary Surveying Report with the neighbouring owner to provide a clear account of the evidence and findings.
- Seek to resolve the matter through constructive discussions before considering formal legal proceedings.
- Consider the limited extent of the apparent masonry encroachment when assessing the proportionality of any proposed action.
- Give separate consideration to the roof, fascia and eaves projecting into the adjoining airspace.
A professional boundary survey provides an evidence-based opinion regarding the apparent boundary position. It does not, of itself, legally establish or alter the ownership of land.
Where the parties cannot reach agreement, specialist legal advice may be necessary to determine the appropriate course of action.
However, boundary disputes can become disproportionately expensive when the parties’ positions become entrenched before the documentary and physical evidence has been properly considered.
Early professional advice can therefore be particularly valuable in establishing the relevant facts, identifying the extent of any apparent discrepancy and supporting proportionate discussions between neighbouring owners.
This case demonstrates the importance of a methodical approach to boundary surveying, particularly where new construction has taken place close to a neighbouring property.
By combining historical conveyance documentation, Land Registry records, mapping evidence, planning information and carefully referenced site measurements, Stokemont was able to identify the apparent boundary alignment and assess the completed construction against it.
The investigation also demonstrated why even a relatively small apparent encroachment should be considered in context, with particular attention paid to projecting roof structures and other elements extending beyond the principal masonry construction.
Stokemont provides professional boundary surveying services to property owners, landlords, developers and other property professionals who require independent advice regarding disputed or uncertain boundaries.
Our boundary investigations are tailored to the circumstances of each instruction and may include:
- Boundary inspections and on-site measurements.
- Historical conveyance and title document research.
- Land Registry and Ordnance Survey mapping reviews.
- Historical aerial imagery and planning record investigations.
- Assessments of boundary walls, fences and adjoining extensions.
- Investigations into potential land and airspace encroachment.
- Preparation of comprehensive Boundary Surveying Reports.
- Professional advice to assist with boundary disagreements and potential dispute resolution.
Whether a concern relates to a neighbouring extension, boundary wall, fence alignment or potential encroachment, obtaining an independent professional opinion can provide clarity and help inform the next steps.
For further information about our boundary surveying and boundary dispute services, contact Stokemont to discuss your requirements with our surveying team or use our instant quote now.
