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External Works

Building Technology · Level 6  ·  4 Chapters

Compiled by: Wambui Muriuki

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What External Works covers

Landscaping, drainage channels, external paving, and gates with perimeter fences make up External Works in Building Technology Level 6. Landscaped areas are determined and the ground prepared before vegetative features are planted. Drainage work follows the drainage drawings through excavation, backfilling, pipe laying and collection chambers. Paving is laid after a ground survey, excavation, base preparation and levelling, with kerbs and surface drainage. Gate location, measurements and supports, and the perimeter fence, finish the unit.

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Careers after External Works

Landscaping, drainage, topography surveys and gate placement are the backbone of every building project in Kenya - from a new housing estate in Kiambu to a boutique resort on the coast. Mastering these skills opens doors to a variety of roles where you’ll shape the look, safety and functionality of the built environment.

  • Landscaping layout - Calculate exact planting areas for residential estates, commercial complexes, or tourism resorts in places like Naivasha and Diani. Your numbers help landscape contractors price soil, turf, and ornamental plants, and enable property developers to present attractive, cost-effective green spaces to buyers.
  • Drainage drawing interpretation - Read and apply drainage plans for urban housing schemes, county road upgrades, and school construction projects across counties such as Nakuru and Kisumu. Accurate work prevents flooding, saves municipalities money on repairs, and makes you a valuable asset for civil-engineering firms and community-development NGOs.
  • Topographic surveying - Produce ground-profile maps for new subdivisions, industrial parks in Athi River, or agricultural irrigation schemes in Kitui. Survey data guides earth-moving crews, informs earth-work cost estimates, and is essential for any contractor bidding on a public works contract.
  • Gate location and orientation - Determine optimal gate positions for security-focused estates in Westlands, farm homesteads in Meru, or gated industrial compounds in Mombasa. Proper orientation improves traffic flow, enhances safety, and is a service you can offer as an independent site-planning consultant.
  • Freelance or small-business opportunities - Combine these abilities to start a boutique external-works service: offering site-layout plans, drainage solutions, and gate installations for private homeowners, small developers, and NGOs building community facilities.
  • Employment pathways - Join construction companies, civil-engineering contractors, real-estate development firms, or county public works departments where teams rely on precise external-works calculations to keep projects on schedule and within budget.

With these capabilities you’ll be the person who turns a blank plot into a safe, beautiful, and functional space - a skill set that is always in demand across Kenya’s growing built environment. Keep building your expertise; every measured square metre brings you closer to shaping the country’s future.

Chapters

1
To perform landscaping
12 topics
Open chapter →
2
To construct drainage system
11 topics
Open chapter →
3
To lay external paving
7 topics
Open chapter →
4
To construct gates and fences
13 topics
Open chapter →
What External Works covers: 23 main topics in 4 chapters

1. To perform landscaping

  1. 1.1 Determination of area for landscaping
  2. 1.2 Preparation of landscaping ground
  3. 1.3 Planting vegetative features
  4. 1.4 Method of irrigation
  5. 1.5 Beautification

2. To construct drainage system

  1. 2.1 Interpretation of Drainage drawings
  2. 2.2 Excavation of Drainage channels
  3. 2.3 Backfilling, Levelling and compacting
  4. 2.4 Laying of Drainage pipes
  5. 2.5 Construction of Drainage channels and collection chambers

3. To lay external paving

  1. 3.1 Ground survey
  2. 3.2 Ground excavation
  3. 3.3 Base preparation
  4. 3.4 Levelling
  5. 3.5 Kerbs stones, surface drainage
  6. 3.6 Laying external paving
  7. 3.7 Marking

4. To construct gates and fences

  1. 4.1 Gate location and orientation
  2. 4.2 Gate measurements
  3. 4.3 Gate supporting systems
  4. 4.4 Procurement and installation of the gate
  5. 4.5 Perimeter fence
  6. 4.6 Essential services

Practise this unit

The practical 46 The assessment itself: tools, materials and the marks Step-by-step guide 46 PPE, each step, what good looks like, common mistakes

Revise this unit

Exam-style questions 56 Written to CDACC standard, with answers Test yourself 158 Multiple-choice, one at a time Practise questions 124 Quick recall — check you know the facts
3 more for this unit
Oral exam preparation 34 What the assessor asks, and how to answer out loud Worked calculations 15 Step-by-step maths with the common mistakes Quick cards 742 Myth busters, skill tips and scenarios

Beyond the syllabus

Decision simulator 4 On site, what would you do? Workplace scenarios 81 Real site situations — what would you do? Turn this into income 48 Where this skill earns — what to charge, how to find clients

Other units in Module III