Project
Grade II* Listed Roof Replacement, Lonsdale Square
A documented natural Welsh slate roof replacement with consent-led planning, structural repairs, insulation and leadwork.
Roof Tiling & Slating
Roof Tiling and Slating for Period and Private Homes
Covering condition and compatibility
Choose the material route after the existing roof has been understood
A broken slate or tile can be a local defect. Repeated slipping, widespread fixing failure, brittle coverings, failing underlay or several deteriorated junctions can point to a broader roof refurbishment. The right scope depends on the condition of the roof as a whole, not simply the first visible failure.
Slate roofing and clay tile roofing share the same need for sound setting-out, secure fixing, drainage and well-resolved junctions, but they are not interchangeable materials. Pitch, gauge, profile, thickness, retained covering and the visual character of the building all influence what is appropriate.
On period, listed and conservation-area homes, retention and matching may also be guided by drawings, consent conditions or a professional specification. ER Group London can deliver the agreed roofing scope while keeping those project responsibilities distinct.
The aim is to avoid both extremes: replacing a roof that could be repaired, or repeatedly patching a covering that is no longer reliable as part of the wider roof build-up.
Where this service applies
Slate and tiled roofs that need more than a material-only answer
The appropriate scope depends on condition, retained materials, roof geometry, access, leadwork, drainage and the property context.
Local Slate or Tile Repairs
Isolated damaged or displaced slates and tiles can sometimes be addressed without treating the entire roof as failed.
Planned Roof Renewal
Widespread covering, fixing or junction defects may justify coordinated refurbishment rather than repeated patch repairs.
Period & Listed Homes
Retention, matching and visible character can be important where the roof contributes to the building’s significance or appearance.
Mixed Roof Details
Slate or tile often meets leadwork, masonry, valleys, parapets, rooflights and other construction that must weather as one roof.
Prominent Roof Slopes
Course alignment, profile and finish matter more where the roof is clearly visible from the street, garden or neighbouring property.
Professional-Team Projects
Architects and surveyors can provide drawings, specifications or approval information that the roofing scope must follow.
Inspection before specification
Decide what can stay, what has failed and what must connect to it
Retention and replacement decisions should follow the condition of the covering and the roof details around it.
Existing condition
Retention starts with evidence
Review the covering, visible fixing condition, previous repairs, drainage and adjoining junctions before deciding how much of the roof needs intervention.
- Slate or tile condition
- Fixing and underlay where visible
- Previous repairs
- Water paths and junctions
- Chimneys, valleys and abutments
- Safe access limitations
Natural slate roofing
Match the roof, not just the colour of the slate
Slate selection and setting-out need to respond to the existing material, thickness, size, gauge, pitch, course pattern and the weathering details around the roof.
- Size, thickness and gauge
- Course layout and pitch
- Ridges, valleys and leadwork
- Retention and matching where suitable
- Dormers and rooflights
- Approved material route where relevant
Clay tile roofing
Profile and setting-out matter as much as appearance
Clay tiled roofs need the replacement profile, gauge, ridges, hips, verges and junctions to work with the existing roof rather than being selected by colour alone.
- Tile profile and gauge
- Ridges, hips and verges
- Compatible replacement material
- Valleys and abutments
- Eaves and ventilation details
- Visible roof character
Tiled roof repair
A slipped or cracked tile may be a symptom of a wider detail
A visible tile defect can be caused by movement, poor previous repair, failed fixings, weather exposure, impact damage or a weakness at an adjoining roof junction. The repair should follow the cause where it can be identified.
- Cracked, slipped or missing tiles
- Fixing condition
- Verge and ridge details
- Valleys and roof edges
- Previous repairs
- Surrounding roof condition
Verified Grade II* project
Lonsdale Square: natural Welsh slate on a listed terrace
At Lonsdale Square, ER Group London replaced an inappropriate man-made slate covering after the recorded approval process. Structural remedials and insulation were addressed before the Grade II* listed terrace was re-slated in natural Welsh slate, with renewed leadwork and parapet repairs completing the roof scope.
- Grade II* listed terrace
- Natural Welsh slate
- Structural remedials and insulation
- Renewed leadwork
- Parapet repairs
- Documented project evidence
Material and property constraints
Matching is a technical and visual decision
A replacement covering has to work with retained fabric, roof geometry and the requirements that apply to the property.
Retained Fabric
Serviceable slate, tile and adjoining details should be identified before the scope assumes wholesale replacement.
Material Availability
A visually similar product is not automatically a suitable match; availability, dimensions and compatibility need to be checked.
Pitch & Geometry
Roof pitch, course layout, valleys, hips, dormers and changes of level influence the covering and its junction details.
Heritage Requirements
Listed or conservation-sensitive work may need to follow approved drawings, conditions or professional material requirements.
Concealed Conditions
Underlay, battens, substrate or structural defects may only become clear once controlled areas are opened.
Access & Protection
Scaffolding, occupied rooms, gardens, neighbouring property and temporary weathering can affect the delivery plan.
Junctions and roof edges
A good covering still depends on the details around it
Valleys, abutments, ridges, verges and drainage need to be resolved with the slate or tile rather than treated as separate finishing items.
Valleys and abutments
Coordinate the covering with its leadwork
Valleys, chimneys, walls, dormers and other abutments connect the slate or tile to leadwork and masonry, making the junction part of the covering decision.
- Valleys and flashings
- Wall and chimney abutments
- Dormers and penetrations
- Leadwork laps and detailing
- Water paths
- Masonry interfaces
Roof edges
Ridges, hips, verges and eaves define the finished roof
The perimeter and high points of the roof affect water shedding, wind exposure and the visible outline, so they should be considered with the main covering.
- Ridges and hips
- Verges and eaves
- Roof outline and course alignment
- Weather exposure
- Fixing and finish
- Matching with retained areas
Wider refurbishment
Coordinate what sits beneath and beside the covering
Where the agreed scope includes underlay, battens, insulation, ventilation, drainage or adjoining roof areas, those decisions should be coordinated before the covering is closed over them.
- Underlay and battens where in scope
- Insulation and ventilation where in scope
- Drainage and adjoining roof areas
- Flat-roof interfaces
- Rooflight and chimney junctions
- Future maintenance access
Delivery controls
Keep material decisions and roof protection visible through the work
The agreed covering route, property protection, weather exposure and changes found during opening-up should remain clear from start to completion.
Recorded Material Route
Retention, replacement and matching decisions are kept aligned with the agreed scope and any project specification.
Temporary Weathering
Opening-up and closing roof areas are sequenced with the vulnerability of the property and forecast conditions in mind.
Property Protection
Access routes, occupied areas, gardens and finished surfaces are considered before materials and waste are moved through the property.
Completion Review
The completed covering and the principal junction details are reviewed, with relevant observations or future maintenance priorities recorded.
Changed Conditions
Where concealed defects are found during opening-up, the implications for scope, cost and sequence should be recorded before proceeding.
Clear Handover
The handover should reflect the agreed roof scope, key materials, completed junctions and any maintenance priorities.
Related Projects
Project
Lonsdale Square Roof Replacement
A documented Grade II* listed terrace project involving natural Welsh slate, renewed leadwork, parapet repairs, insulation and structural remedials.
Completed work
Our Work
Completed residential roofing projects, including roof replacement, refurbishment, roof terraces and repair.
Slate & Tile Roofing FAQs
Questions About Slate and Tiled Roofs
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Often, yes, where the surrounding covering, fixings and junctions remain serviceable. The extent of repair should follow inspection rather than the assumption that every leak requires a new roof.
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Broader renewal may be appropriate where defects are widespread, fixings or underlay are failing, repeated patch repairs are no longer proportionate, or several roof junctions need coordinated work.
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Yes, where condition, compatibility and the agreed project requirements support retention. Reuse should be based on the material actually found on the roof rather than a blanket assumption.
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Matching considers dimensions, thickness or profile, gauge, colour, texture, course layout and the character of retained roof areas. Heritage or professional requirements may add further constraints.
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Yes. Slate and clay tile roofs can both provide durable pitched coverings, but they differ in material behaviour, weight, gauge, profile, setting-out and visual effect. The correct choice depends on the existing roof, pitch, structure, detailing and property context.
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Yes, where the roofing scope is suitable. ER Group London can work to the approved drawings, specifications or consent conditions provided for the project; the relevant authority or appointed professional determines the approval requirements.
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That depends on the property, roof structure, approvals, specification and agreed project route. Where a change of material is proposed, weight, appearance, fire performance, building-control requirements and any heritage constraints should be understood before work is specified.
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Send the property address, photographs where safe to obtain, the covering type if known, the symptoms or intended work, and any survey, drawings, previous repair history or heritage information already available.
Slate & tiled roof enquiry
Discuss a Slate or Tiled Roof
Send the property address, photographs where safe, the known covering type, symptoms or planned work, and any survey, drawings or heritage information already available.