The Border Stronghold
From Monmouth School estates to Wye Valley timber frames.
1. Get Free Quote
Submit your riverside address. We assess humidity risk and timber exposure.
2. Arrive & Pay
Accept the quote to book. Payment only taken on-site once flight safety is confirmed.
3. The 20-Min Scan
We inspect every eave, valley, and gutter for moss, blockages, and hidden damp.
4. Full Data Package
PDF Report + 4K video + Moss & Damp Map for insurers or conservation officers.
The "Hidden Damp" Guarantee
In the humid Wye Valley, ground surveys miss critical damp sources. If we find no actionable defects, you pay only 50%.
*Applies to timber-framed properties in NP25 and NP16.
TRACE & ACCESS FOR THE WYE VALLEY
Spot the invisible damp.
The Wye Valley’s humidity breeds moss, algae, and gutter blockages that lead to chronic damp in timber-framed homes. These issues are often invisible from ground level.
Our drone survey reveals what matters:
- ✅ Moss Growth Mapping: Identify saturated zones prone to water ingress.
- ✅ Gutter Blockages: Spot organic buildup causing overflow into eaves.
- ✅ Timber Rot Early Signs: Detect discolouration before structural damage.
Monmouth: Two Rivers, and a Great Deal of Listed Roof
Where the Monnow meets the Wye, damp and heritage constraints arrive together.
Listed Town Centre Rooflines
Monnow Street, Agincourt Square and the lanes behind them carry a dense run of listed buildings whose roofs step, join and share valleys between neighbours. Nobody can see those junctions, and physical access needs consent as well as a pavement licence. An aerial survey needs neither and touches nothing.
River Valley Damp and Flood Aftermath
Sitting at the confluence of two rivers keeps humidity high, and a property that has taken flood water needs its roof and rainwater goods checked as carefully as its ground floor. Blocked downpipes and failed gutter joints keep feeding water into a wall that is already struggling to dry out.
Trace and Access at Wyesham and Redbrook
The steep ground at Wyesham and along the Redbrook road puts rear elevations well beyond ladder reach. When damp appears on a bedroom ceiling, the breach is usually somewhere on that inaccessible slope. We photograph the whole plane at zoom so the entry point is found before anyone opens up a roof.
An Assessment With Nothing Attached
CalonTerra does not repair roofs or rainwater goods, so a Monmouth report contains no upsell. You pay a fixed fee, receive every raw image plus the 4K video, and use it however you need — for an insurer, a lender, a conservation officer, or simply to know where you stand.
Owning a Timber-Framed Home in Monmouth?
"The damp keeps coming back."
Traditional surveys focus on internal symptoms, not external causes. Moss and blocked gutters on riverside properties are the real culprits.
The Solution: Aerial mapping of moisture sources to stop damp at the root.
Insurance & School Estates
Institutions like Monmouth Haberdashers require non-intrusive, evidence-based roof audits.
- ✅ High-Value Property Reports: Accepted by specialist insurers
- ✅ Riverside Risk Mapping: Document exposure to Wye humidity
- ✅ Non-Intrusive Method: No disturbance to historic fabric
Typical Defects We Expose
Moss & Algae Buildup
Traps moisture against timber eaves, causing chronic damp in humid valleys.
Timber Soffit Rot
Early discolouration visible only from above. Critical for preservation.
Chimney Cap Displacement
Allows rain ingress into flues — common in exposed riverside locations.
Lead Valley Failure
Thermal expansion in valley junctions causes splits — worsened by humidity.
Wye Valley Intelligence
Specific checks for Monmouth’s unique microclimate:
- Riverside Humidity Mapping: Identify high-moisture exposure zones
- Timber Frame Integrity: Non-contact inspection of historic structures
- School & Estate Audits: Discreet, out-of-hours surveys for institutions
- Conservation Officer Reports: Accepted by Monmouthshire Council
Monmouth Pricing
Zero Travel Cost for NP25, NP16. Riverside Surcharge Waived.
Basic Check
£145*
"Is my gutter blocked?"
- • 15 Minute Flight
- • Raw Images + Moss Map
*No travel fees for NP25/NP16
Full Condition Report
£265*
Most Popular.
- • Full Roof & Gutter Scan
- • PDF Condition Report
- • Hidden Damp & Moss Log
*Includes timber frame assessment
Estate Agents / Schools
Volume
High-Value Property Reports
- • Conservation Officer Submissions
- • Institutional Compliance
*Zero travel fees within NP25, NP16.
Pilot Certification & Insurance
Your assurance for a safe, compliant, and discreet survey.
CAA Operational Authorisation
UK CAA A2 Certificate of Competency (A2 CofC).
- ✅ Fully Insured: £5M Public Liability.
- ✅ Riverside Trained: Humidity-aware flight protocols.
- ✅ GDPR Compliant: Data managed to strict ICO protocols.
NP25 Border Stronghold
Serving the Wye Valley with climate-specific expertise.
- 📍 Monmouth Town: Timber-Framed Core
- 📍 Wyesham: Riverside Estates
- 📍 Trellech: Historic Village
- 📍 Redbrook: Border Conservation
- 📍 Penallt: Valley Timber Homes
- 📍 Llandogo: Remote Riverside
Wye Valley Materials
Book Your Monmouth Riverside Survey
Mention "Timber Frame" or "Hidden Damp" for priority.
Monmouth Drone Surveys: NP25 Questions
What Monmouth, Wyesham, Trellech and Redbrook customers ask.
Can you survey a listed building on Monnow Street?
Yes. Listing restricts alteration to the building, not aerial photography, and because the aircraft makes no contact there is nothing to consent to. For a listed Monmouth roof it is usually both the quickest and the least intrusive option available.
We flooded. What should be checked on the roof?
Gutters, downpipes, hoppers and any valley discharging near the affected elevation. A wall drying out after flooding cannot cope with extra water from a failed gutter joint, and those joints are exactly what nobody inspects. We record the entire rainwater system from above.
Do you cover Wyesham, Trellech, Redbrook and the Wye valley villages?
Yes, along with Monmouth itself, Raglan and the Skenfrith side. Travel from our Pontypool base is calculated for your postcode in the quote form on this page, so you see the full figure before booking.
Can you survey a farm or a group of rural buildings?
Yes, and it is efficient here. A farmhouse with barns and outbuildings around Trellech or Llandogo can be flown in one sortie, with each roof documented separately so you can plan maintenance rather than react to whichever one leaks first.
Is there any airspace restriction over Monmouth?
Nothing that prevents ordinary survey work in the town, though we check the day's restrictions and any gliding or military low-flying activity in the wider Wye valley as part of standard pre-flight planning.