What Does a Building Surveyor Check in the Loft?

Access and Inspectability

First things first: can we actually get up there? For a Level 3 survey, we'll enter the loft space and carry out a full inspection. For a Level 2, we'll carry out as thorough an inspection as possible from the hatch if full entry isn't practical. We note in every report if any area was inaccessible and why.

If a loft has been boarded throughout, this can actually limit our inspection — boards over the insulation mean we can't see the joist ends or ceiling structure below. We note this too.

The Roof Structure

This is the main event. The roof structure in a typical Bolton Victorian terrace consists of:

• Common rafters — the main sloping timbers that support the roof covering. We check for splits, fractures, overloading and any signs of repair or replacement.
• Ridge board — the horizontal timber at the apex. Sagging ridge boards indicate either structural overloading or decay in the rafters.
• Purlines — horizontal timbers that provide mid-span support to the rafters. We check for deflection, which can indicate inadequate intermediate support.
• Collar ties and struts — these resist the outward thrust of the roof. We check that all collar ties are in place and intact.
• Wall plates — the timbers at the top of the walls on which the rafters bear. These are particularly prone to wet rot where the roof covering has failed or gutters have overflowed.

Signs of Water Ingress

Evidence of water ingress is one of the most common findings in Bolton loft spaces. We look for:

• Staining on timbers — brown, tide-mark staining on rafters, battens and boards indicates past or current water entry. Fresh staining is more concerning than old, dried stains.
• Wet rot in timbers — soft, spongy, discoloured timber that crumbles when pressed. Often found at wall plate level or at the feet of rafters where they overhang the gutters.
• Efflorescence on masonry — white salt crystallisation on the internal faces of chimney stacks indicates water penetration through the flaunching, flashings or mortar joints.
• Staining at chimney bases — a classic location for water entry, particularly in end-terrace properties with shared chimney stacks.
• Condensation on cold surfaces — in underinsulated lofts, condensation can form on the underside of the roof covering, leading to secondary timber decay.

Roof Covering and Sarking Felt

We can often see a lot about the roof covering from inside the loft. Key things we look for:

• Sarking felt condition — the underlay beneath the slates or tiles. In many Bolton Victorian properties, this is either absent (open rafter constructions were common) or is a bituminous felt that has become brittle and holed over time. A secondary underlay fitted internally is sometimes present as an interim repair.
• Missing or slipped slates — daylight visible through the roof covering is an immediate red flag. Even one or two missing slates can allow significant water entry during heavy rainfall.
• Ridge and hip tiles — we note if ridge tiles appear insecure from the loft void as a cross-reference for the external inspection.

Insulation

Modern building regulations require 270mm of mineral wool insulation between and over the ceiling joists. Many older Bolton properties are significantly underinsulated. We note the approximate depth and condition of existing insulation and flag any areas where it's missing or has been displaced (commonly by storage).

Water Tanks and Services

Many older Bolton properties still have cold water storage tanks in the loft — a traditional system that predates mains-pressure plumbing. We check:

• Tank condition — including whether it has a lid (open tanks can harbour contamination), whether the ball valve is functioning and whether there is any evidence of overflow.
• Pipe insulation — unlagged pipes and tanks in loft spaces are vulnerable to freezing in cold winters.
• Electrical wiring in the loft — we note any visible cable and flag any that appears old or potentially unsafe.

Frequently Asked Questions

Do Level 2 surveys include a loft inspection?

A Level 2 HomeBuyer Report includes an inspection of the loft space from the hatch — it's a visual inspection as far as the surveyor can reasonably see. A Level 3 Building Survey goes further, with the surveyor entering and traversing the loft space to carry out a more thorough inspection of all accessible areas of the roof structure.

How much does a loft conversion affect a survey?

A loft conversion significantly changes the structural considerations for the property. We'll check that the conversion appears to have appropriate structural elements (steels, trimmers etc.), that there's evidence of building control approval, and that the new roof structure appears sound. Properties with unconverted lofts that have clearly been prepared for conversion — insulation removed, boards over joists — should be checked carefully for any structural alterations that may have been made without approval.