Specifications for Home Extension, Loft & Garage Conversion Plans

The Construction Notes and Specifications form an essential component of a Building Regulations plans submission.

Building Regulations Guidance Notes and Approved Documents are an aid to compiling Construction Notes for drawings but preparing a clear and concise specification for an Application can prove to be an arduous task.

This is where our innovative and easy-to-use App for producing Building Regulations Specifications for Home Extension, Loft and Garage Conversion Plans comes into its own, offering more than standard construction guidance.

Here's a screenshot of the Building Regulations Specification App (for house extensions):

Our categorised pre-prepared Building Regulations Construction Notes can be added within the App with a few clicks of the mouse into a specification that is custom-designed to meet the requirements of your Building Project.

Many of our construction notes are very specific, so please select the correct one for your situation (ie correct dimensions, type of insulation) and type of plans (ie house extensions, loft or garage conversions), eg

SOLID FLOOR INSULATION OVER SLAB To meet min U value required of 0.22 W/m²K Solid ground floor to consist of 150mm consolidated well rammed hardcore. Blinded with 50mm sand blinding. Provide 100mm ST2 or Gen1 reinforced concrete ground bearing slab under a 1200mm gauge polythene dpm or 3 coats RIW. Dpm to be lapped in with dpc in walls. Floor to be insulated over slab and dpm with min 75m thick Celotex GA4000, 25mm Celotex insulation to continue around floor parameters to avoid thermal bridging. A vcl should be laid over the Celotex insulation boards and turned up 100mm at room parameters behind the skirting, all joints to be lapped 150mm and sealed. Finish with 65mm sand/cement finishing screed with light mesh reinforcement. Where drain runs pass under new floor provide A142 mesh 1.0m wide and min 50mm concrete cover over length of drain. Where existing suspended timber floor air bricks are covered by new extension, ensure cross ventilation is maintained by connecting to 100mm dia upvc pipes with 100mm concrete cover laid under the extension. Pipes to terminate at new 65mm x 215mm air bricks with cavity tray over.

However, the site makes it easy to choose your specification.

The note above would be found by navigating through the App in the House Extensions section::

Ground Floors

Solid Floor

Insulation Over Slab

Screed Finish

75mm Celotex

Concise Notes like these shown above, can be added to your house extension specification with just a few clicks in our app! (You can also add the associated construction detail drawing to your basket.)

Another example (from House Extensions):

WARM PITCHED ROOF UNVENTED Pitch 22-45° (imposed load max 0.75 kN/m² - dead load max 0.75 kN/m²)To achieve min U-value required of 0.18 W/m²K Roofing tiles to match existing fixed to tile battens secured over breathable sarking felt to BS747 or relevant BBA Certificate allowing the breather felt to sag at least 10mm over preservative treated counter battens (min 38mm x 50mm). Provide 110mm Celotex FR4000 insulation boards installed under the counter battens and over 47 x 100mm timber rafters (strength class C24 at 400 c/c – to give a max 2.58m span). A vapour control layer should be provided to the underside of the rafters. Finish with 12.5 plasterboard and skim. Restraint strapping - Ceiling joists tied to rafters (if raised collar roof consult structural engineer) and 100mm x 50mm wall plate strapped down to walls across at least 3 timbers using 1000 x 30 x 5mm galvanized straps or other approved to BSEN 845-1 and appropriate noggins at 1.2m centres built into cavity in accordance with CP111 Part 2. Gable walls to be strapped to rafters using galvanized steel built into cavity strapping at 2m ctrs and fixed over 3 rafters with noggins.

Other Building Regulations Construction Notes in our app are supplied with just a single version such as (from House Extension, Loft and Garage Conversions):

ELECTRICAL All electrical work required to meet the requirements of Part P (electrical safety) must be designed, installed, inspected and tested by a competent person registered under a competent person self certification scheme such as BRE certification Ltd, BSI, NICEIC Certification Services or Zurich Ltd. An appropriate BS7671 Electrical Installation Certificate is to be issued for the work by a person competent to do so. A copy of a certificate will be given to the Council.

And (from House Extensions)

LEAD WORK AND FLASHINGS All lead flashings, any valleys or soakers to be Code 5 lead and laid according to Lead Development Association. Flashings to be provided to all jambs and below window openings with welded upstands. Joints to be lapped min 150mm and lead to be dressed 200mm under tiles, etc. All work to be undertaken in accordance with the Lead Development Association recommendations.

The note above can be found at:

Roofs

Lead Work

To start using our free Building Regulations Specification App, you can begin straightaway by clicking one of the main category buttons above, House Extensions, Loft Conversions or Garage Conversions.

If you want some help and guidance before getting started please look at our Quick Start Guide or watch the 3-minute Quick Start Video.

We believe that Buiding Regs 4 Plans can take the hard work out of manually creating a Construction specification from Building Regulations Guidance Notes and the Approved Documents.

Lastly, we hope that you enjoy using our website and app!

The BuildingRegs4Plans Team.

Construction Detail Drawings

As well as the drawings shown with the relevant Building Regulations Specifications, we have a section of quick links where you can easily access a range of common drawings taken from Home Extensions, Loft and Garage Conversions.