Back-to-Back Houses: Roof Geometry and Access Constraints

What is a back-to-back house?

A back-to-back house shares its rear wall with the dwelling behind it, so each property has a front elevation and no rear one. The form was widespread in Birmingham, and a preserved court survives as a museum.

A back-to-back house means terraced housing where two dwellings share a rear wall, each facing opposite ways. Birmingham is the city where back-to-backs were most widespread, with a preserved National Trust example. The shared rear wall removes one elevation, so the roof drains toward the front only.

How does the roof drain with no rear elevation?

With no rear wall of its own, the roof drains toward the street frontage only. There is no rear gutter and no rear downpipe, so the entire catchment discharges through the front rainwater goods.

No rear access, so scaffold reaches the roof from the front or a shared courtyard; the courtyard is shared yards serving several dwellings, with contested access rights. The roof form is a single pitch or shallow double pitch draining to the street frontage.

How do you get access to the roof?

Access comes from the street frontage or through a shared courtyard, since there is no rear garden or alley. Scaffold arrangements frequently need agreement from neighbouring householders before any work can be programmed.

The shared rear wall is party structure for both dwellings. The material of the slate covering is Welsh slate over cut timber, as with other Victorian stock.

• Surviving stock context: few remain; most were cleared, and surviving examples are frequently protected

Who is the neighbour for party structure purposes?

The household behind, not beside. The shared rear wall is party structure between the two back-to-back dwellings, so work affecting it involves the property facing the opposite direction.

Surviving back-to-backs are often listed or in designated areas.

1. The shared rear wall removes one elevation and its a drainage.

Are surviving back-to-backs protected?

Frequently yes. Few back-to-backs survive, and those that do are commonly listed or sit within conservation areas. Material substitution is usually ruled out, and work that would be routine elsewhere can require consent.

1. No rear access forces scaffold to the frontage or a shared courtyard.
2. The neighbour behind, rather than beside holds the shared structure.
3. Surviving examples are frequently protected.

The covering is ordinary; the building is not.

What the roof itself is made of

Party structure runs front to back here, so the party to consult is the household behind — the opposite of a normal terrace. With no rear elevation there is no rear gutter, so the entire roof discharges to the street frontage.

Arranging a site visit

The scaffold question determines feasibility and cost before any roofing decision is made. Surviving back-to-backs are commonly listed or designated, so material substitution is usually ruled out.

Back-to-back house, and 4 more

• back-to-back house
• party structure
• courtyard
• single pitch
• shared rear wall

A back-to-back pair shares a party wall with no gap and no rear elevation, so the two roofs drain into a central valley gutter that neither owner can reach from their own property. Only the front slope is accessible. That geometry decides every job on this stock: access is from the front or from scaffold, the valley cannot be inspected from ground level, and work at the shared boundary needs the neighbour's agreement before anything is priced.

Read next

• party wall roof repair
• Victorian Terrace Roofs in Birmingham
• local roofer birmingham
• bournville roof repair

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