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Considering a loft conversion? Fantastic! A loft conversion can become a guest bedroom, study, or playroom, adding both space and value to your property. Typically costing £20-45,000 and taking 4-8 weeks, it’s a worthwhile investment. To decide the best conversion for you, think about your roof’s shape, your permitted development rights and budget. Working with our skilled architects ensures you get the best plans. This guide to loft conversion in London will walk you through the entire process, from start to finish.

Contact us at 02080509695 to explore your loft conversion options!

Common Types of Loft Conversion in London

Skylight Loft Conversion

It’s often the budget-friendly choice. This conversion keeps your existing space, just adding roof windows. Expect some work: reinforcing the floor, adding stairs, and setting up essentials like electrics, plumbing, and insulation for a cozy space. Roof lights are great for natural light and ventilation, with minimal disruption to your current living area. The frame fits into a new roof opening, and flashings are added, making the tiling around the window look seamless.

Ideal for smaller loft conversions or simple loft bedrooms, but remember, you need at least 2.25m of head height in the room center for a proper floor build-up. New stairs might need to come into the center due to limited headroom.

The best part? In most cases, no planning permission is needed, unless the roof lights face the front of your house.

Dormer Loft Conversion

It’s a popular and cost-effective option. A dormer extends vertically from the sloping roof, using standard windows instead of rooflights. It can cover the entire roof width or have smaller windows at intervals. This design adds headroom, creating a user-friendly space with flat ceilings and walls. While it might not always win design awards, it often falls under permitted development. You can go for a gabled dormer for a more appealing look, but it might be a bit pricier and limit internal headroom.

Hip to Gable Loft Conversion

Perfect for bungalows or semi-detached houses, this conversion straightens the slanted (hipped) end of your roof, forming a vertical wall (the gable end).

How? The existing roof is adjusted, and the end wall is built up to create the new gable with a standard pitched roof. The result? A spacious interior with full headroom.

Why it’s great: The new vertical wall allows for standard window openings, flooding your space with natural light. Ideal for brighter, roomier vibes.

L-shaped Loft Conversion

An L-shaped loft conversion joins two dormer windows to create an L shape on your roof. These dormer windows are like little rooms that stick out from the slope of your roof. One dormer is bigger and goes on the main part of your roof, while the smaller one sits on the back part. This setup gives you extra space, making two big rooms instead of one. Plus, it lets in lots of sunlight, making the rooms bright and airy.

What Are the Rules for Different Houses for Loft Conversion in the United Kingdom?

In the UK, different types of houses have different rules for converting their lofts. Here’s a breakdown:

Detached or Bungalow Houses: If you’re converting a loft into a detached or bungalow house, you can typically add up to 50 cubic meters of extra roof space without planning permission.

Semi-Detached Houses: For semi-detached houses, the permitted additional roof space is also up to 50 cubic meters.

Terraced Houses: In the case of terraced houses, you can add up to 40 cubic meters of extra roof space without planning permission.

For further information or to discuss your loft conversion project, feel free to contact us at 02080509695 or email us at: You can also fill out our “Get a Quote” form to receive personalized assistance for your project. We’re here to help you make the most of your space!

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What is the Planning Permission of Loft Conversion?

Planning permission for a loft conversion is the approval needed from local authorities before making changes to your loft. Typically, loft conversions are considered permitted development, meaning you don’t need planning permission. Instead, you can apply for a Lawful Planning Application, which proves that the work done on your property is legal. This can be useful when selling your home or providing added value to your property. Essentially, it’s a way to ensure your construction work is legitimate.

The Most Commonly Asked Question: Do I Need Permission To Add a Loft to My Property?

Building a loft conversion is an easy and relatively quick way to add helpful value to any house. Converting a loft conversion is considered to be permitted development subject to the following Limitations and Conditions:

Suppose these limits and conditions are unmet, or Permitted Development rights have been removed in the area. In that case, an application for Householder/Full Planning Permission will be required.

How will xLine Architecture guide Loft Conversion?

We provide Architectural drawings, Planning Applications (certificate of lawfulness), Structural calculations, etc.

To start the project, here’s what we’ll do:

  1. First, we’ll visit your property to discuss your ideas and needs. Then, our Architect will do a thorough survey to map out the existing layout and plan the proposed changes, including details like room layouts, window placements, and staircase positioning.
  2. Then, the Architect will draw the existing and proposed architectural plans.
  3. The Architect will take 7-10 days to draw the plans, and we will send them to the client through Email. If clients have any queries, they will mail us, and if the drawings are okay, they will also let us know about them.
  4. Once the client confirms the drawings, we will prepare a certificate of lawfulness and submit it to the council.
  5. The Council will take two weeks to register the application; they will send us a validation letter after registration. After four weeks, we will chase the case officer to check if everything is okay. Once a decision is received, we will move to the next stage, structural calculations.
  6. Based on architectural drawings, our Structural Engineer will prepare a structural layout and structural calculations report for the proposed loft conversion.
  7. We can also help to submit the building notice with drawings and calculations. We will answer if your builder has any queries until the completion of the work.

As for existing and proposed plans, it means our Architect will draw detailed floor plans, elevations, sections, volume calculation and other necessary documents.

The volume allowed for your loft conversion depends on your house type:

Certificate of Lawfulness

We will fill out a form., organize a block plan, location plan, and design access statement, prepare the architectural drawings for application, and apply.

In the application form, we will need to nominate the client to pay the planning application form. After getting the validation letter, we will start the next step. In the validation letter, we will find the case officer( Name, Email, Number, Target decision date, etc).

Structural calculations

Based on architectural drawings, the structural engineer will prepare a structural report which will show the following things:

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Is Building Regulations Approval Needed for a Loft Conversion?

If you’re considering a loft conversion, you need to apply for building regulations approval. For most house extension works, building regulation approval is necessary. You need permission from the building authority to turn a loft or attic into a usable living area. Building regulations approval can guarantee things like:

Your loft conversion project can operate more smoothly with the assistance of a planning specialist. Get a quote or a free consultation by calling 02080509695! Learn more about the approval of loft conversion building regulations.

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