diff --git a/source/packages/plg_system_mokosuiterealty/src/Helper/OfferHelper.php b/source/packages/plg_system_mokosuiterealty/src/Helper/OfferHelper.php
new file mode 100644
index 0000000..54ad2c5
--- /dev/null
+++ b/source/packages/plg_system_mokosuiterealty/src/Helper/OfferHelper.php
@@ -0,0 +1,108 @@
+<?php
+namespace Moko\Plugin\System\MokoSuiteRealty\Helper;
+
+defined('_JEXEC') or die;
+
+use Joomla\CMS\Factory;
+use Joomla\Database\DatabaseInterface;
+
+/**
+ * Offer management — submit, counter, accept/reject, contingency tracking.
+ */
+class OfferHelper
+{
+	/**
+	 * Submit an offer on a listing.
+	 */
+	public static function submit(int $listingId, int $buyerContactId, float $offerAmount, array $conditions = []): object
+	{
+		if ($offerAmount <= 0) {
+			throw new \InvalidArgumentException('Offer amount must be positive.');
+		}
+
+		$db = Factory::getContainer()->get(DatabaseInterface::class);
+
+		$offer = (object) [
+			'listing_id'       => $listingId,
+			'buyer_contact_id' => $buyerContactId,
+			'offer_amount'     => round($offerAmount, 2),
+			'conditions'       => !empty($conditions) ? json_encode($conditions) : null,
+			'status'           => 'submitted',
+			'submitted_at'     => Factory::getDate()->toSql(),
+		];
+
+		$db->insertObject('#__mokosuiterealty_offers', $offer, 'id');
+
+		return (object) ['success' => true, 'offer_id' => (int) $offer->id];
+	}
+
+	/**
+	 * Get all offers for a listing.
+	 */
+	public static function getForListing(int $listingId): array
+	{
+		$db = Factory::getContainer()->get(DatabaseInterface::class);
+
+		$db->setQuery($db->getQuery(true)
+			->select('o.*, cd.name AS buyer_name, cd.email_to')
+			->from($db->quoteName('#__mokosuiterealty_offers', 'o'))
+			->join('LEFT', $db->quoteName('#__contact_details', 'cd') . ' ON cd.id = o.buyer_contact_id')
+			->where('o.listing_id = ' . (int) $listingId)
+			->order('o.offer_amount DESC'));
+
+		return $db->loadObjectList() ?: [];
+	}
+
+	/**
+	 * Accept an offer — marks listing as pending and rejects other offers.
+	 */
+	public static function accept(int $offerId): object
+	{
+		$db = Factory::getContainer()->get(DatabaseInterface::class);
+
+		$db->setQuery($db->getQuery(true)
+			->select('listing_id')
+			->from('#__mokosuiterealty_offers')
+			->where('id = ' . (int) $offerId));
+		$listingId = (int) $db->loadResult();
+
+		if (!$listingId) {
+			return (object) ['success' => false, 'error' => 'Offer not found'];
+		}
+
+		$db->transactionStart();
+
+		try {
+			// Accept this offer
+			$db->setQuery($db->getQuery(true)
+				->update('#__mokosuiterealty_offers')
+				->set($db->quoteName('status') . ' = ' . $db->quote('accepted'))
+				->set('accepted_at = ' . $db->quote(Factory::getDate()->toSql()))
+				->where('id = ' . (int) $offerId));
+			$db->execute();
+
+			// Reject all other offers on this listing
+			$db->setQuery($db->getQuery(true)
+				->update('#__mokosuiterealty_offers')
+				->set($db->quoteName('status') . ' = ' . $db->quote('rejected'))
+				->where('listing_id = ' . $listingId)
+				->where('id != ' . (int) $offerId)
+				->where($db->quoteName('status') . ' = ' . $db->quote('submitted')));
+			$db->execute();
+
+			// Update listing to pending
+			$db->setQuery($db->getQuery(true)
+				->update('#__mokosuiterealty_listings')
+				->set($db->quoteName('status') . ' = ' . $db->quote('pending'))
+				->where('id = ' . $listingId));
+			$db->execute();
+
+			$db->transactionCommit();
+
+			return (object) ['success' => true, 'listing_id' => $listingId];
+		} catch (\Throwable $e) {
+			$db->transactionRollback();
+			return (object) ['success' => false, 'error' => 'Accept failed'];
+		}
+	}
+}
diff --git a/source/packages/plg_system_mokosuiterealty/src/Helper/ShowingHelper.php b/source/packages/plg_system_mokosuiterealty/src/Helper/ShowingHelper.php
new file mode 100644
index 0000000..facf082
--- /dev/null
+++ b/source/packages/plg_system_mokosuiterealty/src/Helper/ShowingHelper.php
@@ -0,0 +1,102 @@
+<?php
+namespace Moko\Plugin\System\MokoSuiteRealty\Helper;
+
+defined('_JEXEC') or die;
+
+use Joomla\CMS\Factory;
+use Joomla\Database\DatabaseInterface;
+
+/**
+ * Showing management — schedule, feedback, calendar, open house sign-in.
+ */
+class ShowingHelper
+{
+	/**
+	 * Schedule a showing.
+	 */
+	public static function schedule(int $listingId, int $buyerContactId, int $agentId, string $datetime): object
+	{
+		$db = Factory::getContainer()->get(DatabaseInterface::class);
+
+		$showing = (object) [
+			'listing_id'       => $listingId,
+			'buyer_contact_id' => $buyerContactId,
+			'agent_id'         => $agentId,
+			'scheduled_at'     => $datetime,
+			'status'           => 'requested',
+			'created_at'       => Factory::getDate()->toSql(),
+		];
+
+		$db->insertObject('#__mokosuiterealty_showings', $showing, 'id');
+
+		return (object) ['success' => true, 'showing_id' => (int) $showing->id];
+	}
+
+	/**
+	 * Get showings for a listing.
+	 */
+	public static function getForListing(int $listingId): array
+	{
+		$db = Factory::getContainer()->get(DatabaseInterface::class);
+
+		$db->setQuery($db->getQuery(true)
+			->select('s.*, cd_buyer.name AS buyer_name, cd_agent.name AS agent_name')
+			->from($db->quoteName('#__mokosuiterealty_showings', 's'))
+			->join('LEFT', $db->quoteName('#__contact_details', 'cd_buyer') . ' ON cd_buyer.id = s.buyer_contact_id')
+			->join('LEFT', $db->quoteName('#__contact_details', 'cd_agent') . ' ON cd_agent.id = s.agent_id')
+			->where('s.listing_id = ' . (int) $listingId)
+			->order('s.scheduled_at DESC'));
+
+		return $db->loadObjectList() ?: [];
+	}
+
+	/**
+	 * Get agent calendar — all showings for an agent in a date range.
+	 */
+	public static function getAgentCalendar(int $agentId, string $from, string $to): array
+	{
+		if (!\DateTime::createFromFormat('Y-m-d', $from) || !\DateTime::createFromFormat('Y-m-d', $to)) {
+			throw new \InvalidArgumentException('Date parameters must be Y-m-d format.');
+		}
+
+		$db = Factory::getContainer()->get(DatabaseInterface::class);
+
+		$db->setQuery($db->getQuery(true)
+			->select('s.id, s.scheduled_at, s.status')
+			->select('l.address, l.city, l.price')
+			->select('cd.name AS buyer_name, cd.telephone')
+			->from($db->quoteName('#__mokosuiterealty_showings', 's'))
+			->join('INNER', $db->quoteName('#__mokosuiterealty_listings', 'l') . ' ON l.id = s.listing_id')
+			->join('LEFT', $db->quoteName('#__contact_details', 'cd') . ' ON cd.id = s.buyer_contact_id')
+			->where('s.agent_id = ' . (int) $agentId)
+			->where('DATE(s.scheduled_at) BETWEEN ' . $db->quote($from) . ' AND ' . $db->quote($to))
+			->where($db->quoteName('s.status') . ' != ' . $db->quote('cancelled'))
+			->order('s.scheduled_at ASC'));
+
+		return $db->loadObjectList() ?: [];
+	}
+
+	/**
+	 * Record showing feedback from buyer.
+	 */
+	public static function recordFeedback(int $showingId, int $interestLevel, ?string $comments = null): bool
+	{
+		if ($interestLevel < 1 || $interestLevel > 5) {
+			throw new \InvalidArgumentException('Interest level must be 1-5.');
+		}
+
+		$db = Factory::getContainer()->get(DatabaseInterface::class);
+		$filter = \Joomla\Filter\InputFilter::getInstance();
+
+		$db->setQuery($db->getQuery(true)
+			->update('#__mokosuiterealty_showings')
+			->set($db->quoteName('status') . ' = ' . $db->quote('completed'))
+			->set('interest_level = ' . (int) $interestLevel)
+			->set('feedback = ' . $db->quote($comments ? $filter->clean($comments, 'STRING') : ''))
+			->set('completed_at = ' . $db->quote(Factory::getDate()->toSql()))
+			->where('id = ' . (int) $showingId));
+		$db->execute();
+
+		return $db->getAffectedRows() > 0;
+	}
+}