Chapter one
Horsham stone slates and St John the Baptist
The church roof is the village's best-known stone slate roof, and what suits it also guides how we treat every stone roof nearby.
Kirdford's church sets the standard for the village's roofs. The conservation area appraisal lists St John the Baptist as Grade I and notes its Horsham stone slate roof, above a nave from the early 12th century, a 13th-century north aisle and a 15th-century tower. The same appraisal names Horsham stone slates among the local materials, next to handmade clay tiles, red brick, timber framing and winklestone. Stone slate behaves nothing like clay tile. The slates are thick, uneven and individually cut, so no two repairs look alike, and the work starts with sorting. A slate that looks fine from the ground can be cracked across its width, and a gentle tap with a handle, from a ladder, tells us more than a long look from the lane. Which slates are sound, which have split along their bedding, and which have slipped from their fixings decides how much of the roof has to be lifted.
At a glance
- The church is Grade I with a Horsham stone slate roof
- Its nave dates from the early 12th century
- The appraisal lists stone slates among local materials

1.1 How stone slate roofs fail
The faults are usually slow. Moss and lichen hold damp against the surface. The mortar shades laid under the joints crack and drop out. Fixings behind the slates rust and let a slate creep downhill. Water finds the gap and runs along the timber, so what you see as a ceiling stain may sit well away from the loose slate. The loft is where we begin the trace, before we climb up to inspect the places where stone meets lead, at chimneys, valleys and wall abutments. Everything is photographed and sent with the written quote.

1.2 Consent, supply and sensible reuse
Because the church is Anglican and in use, roof works there are authorised by a faculty rather than by the council. Stone roofs on houses are another route: listed building consent where the house is listed and the work goes beyond routine repair. In practice the stone that came off that roof is the first to be laid again. Slates come off, get sorted into sizes and are laid again, and any shortfall is made up with care. Reports in 2019 put new roofing slabs in short supply, so nobody should plan a stone roof job around easy replacements, and we budget time for sorting instead. A roof that can be repaired from its own stone is also cheaper to put right than one needing slabs sourced from afar, which is one more reason the survey comes before the quote. Our Horsham stone roofing page goes into the detail of lifting, sorting and relaying.
What the Kirdford appraisal records about the church
- Church
- St John the Baptist, listed Grade I
- Roof
- Notable for its Horsham stone slates
- Nave
- Early 12th century
- North aisle
- 13th century
- Tower
- 15th century
Source: Kirdford Conservation Area Character Appraisal, Chichester District Council and The Conservation Studio, 2010




