Loft Conversion Guide for London Homeowners

Step 1: Survey and Design

A thorough site survey is completed, assessing the roof and structural requirements. Architects and engineers then create bespoke designs to fit the property’s unique characteristics and the homeowner’s needs.

Step 2: Planning Permission

These designs are submitted to the local planning authority, which assesses the proposal against local regulations and policies. This process ensures developments are

safe, sustainable, and in keeping with the surrounding area. Approval times can vary from weeks to months depending on the project.

The loft may be allowed under permitted development which would negate the need to go through step 2. We would advise discussing this point with an architect.

Step 3: Party Wall Notices

Once the final design is ready, a party wall surveyor will serve party wall notices on adjoining owners affected by the works and who a share a party wall with the property completing the loft conversion.

These are required by law at least 2 months before work commences.

After receiving the notice, adjoining owners have three response options:

1. Consent, allowing the work to proceed without further steps
2. Dissent and appoint a surveyor to represent their interests
3. Dissent and appoint an agreed surveyor (one surveyor acts for both owners)

Regardless of the adjoining owner’s response, the building owner is responsible for the surveyor costs.

In the event of dissent, one or two surveyors will:

1. Review architectural and structural plans
2. Conduct a schedule of condition to record the current state of the neighbouring property
3. Agree a party wall award detailing the scope of work, protections, access arrangements, and procedures for handling any damage

In our experience, the protections afforded to adjoining owners by the Party Wall etc. Act 1996, are likely to be as follows;

Contractor Hand Tool Use

As there are works to be undertaken directly to the party wall, part of the formalities of the Party Wall Award would be that these works are done using hand, or non-percussive tools. This greatly reduces the risk of vibration and any resulting damage.

Temporary Weatherproofing

As the party wall is being exposed as a result of the proposed works. part of the formalities of the Party Wall Award would be that this weathering solution is robust thereby reducing the risk of rainwater and damp ingress into the neighbouring owner’s property.

Temporarily Covering Chimney Breasts & Vents

We would expect the neighbouring property to have some form of open vents or a chimney breast on the party wall. The proposed works will likely result in loose soot finding their way through these openings.

We’d advise these are well covered in advance of the works starting. While this isn’t a major point to implement, it will go a long way to ensure the risk of damage and costly clean up is as low as it can be.

Temporary Roof Access

If the proposed flank of the roof dormer is built up against the neighbouring owner’s air space, it is highly likely the contractors will require access onto the neighbouring owner’s roof to ensure the works are undertaken quickly and safely. Part of the formalities of the Party Wall Award would be that this access is carefully considered and agreed for a limited period of time and subject to protective provisions.

Step 4: Loft Works Start

As set out above, this will start with dismantling the existing roof, installing the steel beams, making the new roof watertight and finally completing the internal finishes.

Step 6: Inspections and Certification

Throughout construction, regular inspections ensure compliance with building regulations. Upon completion, a final certification confirms the project’s safety and quality.

Step 7: Post-work Schedule of Condition Reports

Once the work is completed, the surveyor(s) inspect the neighbouring property. If damage is identified, the building owner is responsible for repairs or compensation.